Au7o mascotAu7o
Known IssuesTest Hub demo
  1. Au7o
  2. /
  3. Known Issues
  4. /
  5. GMC
  6. /
  7. Hummer EV
GMC · Known Issues

2022-2026 GMC Hummer EV Problems: 13 Known Issues

2022-2026 model years · 205+ owner reports · Updated September 2026

Share:@au7o.io

All years · All trims · All engines

Choose the year and equipment for your written issues and visual request.

No email neededHow interest is saved

Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy

Visual coming soon

Your interest helps us choose what to build next.

Visual Known Issues · Coming soon

$4.99/month plus taxes at launch · No payment today

Choose a year to request this visual. Trim and engine are optional; omitted trim is Not specified.

Preview the XT6 example
Known IssuesMotorcycle IssuesDTC LookupDrivePricingAboutTermsPrivacyCookiesConsentData rightsCopyrightFeedback
Share:@au7o.io

Vehicle data and repair guidance on this site are compiled with AI assistance and may contain errors. Always verify with your service manual or a qualified mechanic.

Data protection representation

DataRep representative in the United KingdomDataRep representative in the European Union
Au7o · 2026
Built for DIY mechanics. Privacy-first.
Explore free Hub demo

Choose your vehicle configuration

Choose a year to request this visual. Trim and engine are optional; omitted trim is Not specified.

Which vehicle’s visual would you like?

Choose from our year, make, model and trim catalog. This does not change the page underneath or mean a visual is already available.

Choose a vehicle configuration to continue. No request has been submitted.

Optional email notification

Choose a year to request this visual. Trim and engine are optional; omitted trim is Not specified.

Which vehicle’s visual would you like?

Choose from our year, make, model and trim catalog. This does not change the page underneath or mean a visual is already available.

Choose a vehicle configuration to continue. No request has been submitted.

Issue summary

According to Au7o's analysis of 205+ owner reports, the 2022-2026 GMC Hummer EV has 13 documented known issues, with 6 rated critical. The most serious are Multiple Warning Lights with Speed Limited to 36 MPH ($0-$300 repair), Battery Pack Enclosure Water Ingress, Front Seat Belt Buckle Attachment Bolts Not Tightened to Specification (Recall 23V786) ($0-$0 repair), High-Voltage Battery Pack Internal Connections Mispositioned or Incorrectly Welded (Recall 23V367) ($0-$0 repair), 12-Volt Auxiliary Battery Drain Leaves the Truck Completely Dead While Parked ($0-$450 repair) and Front Passenger Airbag Harness Improper Wire Crimp Prevents Deployment (Recall 25V769) ($0-$0 repair). The most commonly reported issue is Public Charging Failures and Software Anomalies with 120 owner reports. DIY maintenance guides at au7o.io.

In This Article

  • Hummer EV Electrical6
  • Hummer EV Safety/Recalls3
  • Hummer EV Exterior2
  • Hummer EV Body/Panels1
  • Hummer EV Suspension1
  • Recalls5
  • FAQ
Get Started
Back to top

In This Article

  • Electrical6
  • Safety/Recalls3
  • Exterior2
  • Body/Panels1
  • Suspension1
  • Recalls5
  • FAQ

All 13 Known Issues

NHTSA Recalls5 recalls

SEAT BELTS:FRONT:ANCHORAGE

General Motors, LLC (GM) is recalling certain 2023-2024 GMC Hummer EV pick up, 2024 GMC Hummer EV SUV, and 2024 Chevrolet Silverado EV vehicles. The left or right front seat belt buckle attachment bolts may not be tightened properly.

Campaign #23V78600022/11/2023

ELECTRICAL SYSTEM:WIRING

General Motors, LLC (GM) is recalling certain 2024 Cadillac Lyriq, Chevrolet Blazer EV, Chevrolet Silverado EV, GMC Hummer EV SUV, and GMC Sierra EV vehicles. The electric motors in the rear drive units may have insufficiently insulated wires that can contact each other, resulting in a loss of drive power.

Campaign #24V32000009/05/2024

ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

General Motors, LLC (GM) is recalling certain 2022 BrightDrop EV600 and 2022-2023 GMC Hummer EV Pickup electric vehicles. The high voltage battery pack enclosure may not be properly sealed, allowing water to enter the pack.

Campaign #22V77100013/10/2022
🔧
A mechanic who knows YOUR exact car
Answers tuned to your year, make, model & trim — not generic advice. Save your garage so it always has the right context.
Get ahead of GMC Hummer EV problems — free
Leave your email and we'll alert you the moment there's a new recall or known issue for your GMC Hummer EV. Free, no account needed.

Don't see your problem? Describe your symptoms to get a diagnosis, or .

Other GMC Models

GMC Sierra 150035GMC Terrain26GMC Yukon XL24GMC Sierra 3500HD24GMC Acadia22GMC Yukon21

Frequently Asked Questions

What are the most common GMC Hummer EV problems?

According to Au7o's analysis of 205+ owner reports, the 2022-2026 GMC Hummer EV has 13 documented issues. The most frequently reported are: Multiple Warning Lights with Speed Limited to 36 MPH, Battery Pack Enclosure Water Ingress, Front Seat Belt Buckle Attachment Bolts Not Tightened to Specification (Recall 23V786). Of these, 6 are rated critical and should be addressed promptly.

Is the GMC Hummer EV reliable?

The 2022-2026 GMC Hummer EV has 13 known issues documented across 205+ owner reports. 6 issues are rated critical: Multiple Warning Lights with Speed Limited to 36 MPH and Battery Pack Enclosure Water Ingress and Front Seat Belt Buckle Attachment Bolts Not Tightened to Specification (Recall 23V786) and High-Voltage Battery Pack Internal Connections Mispositioned or Incorrectly Welded (Recall 23V367) and 12-Volt Auxiliary Battery Drain Leaves the Truck Completely Dead While Parked and Front Passenger Airbag Harness Improper Wire Crimp Prevents Deployment (Recall 25V769). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common GMC Hummer EV problems?

Repair costs for known GMC Hummer EV issues range from $0 to $1,800, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Multiple Warning Lights with Speed Limited to 36 MPH, typically costs $0-$300 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year GMC Hummer EV is the most reliable?

Reliability varies across model years of the GMC Hummer EV. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2022-2026 GMC Hummer EV with 13 documented issues documented across 205+ owner reports.

What is the 2022-2024 GMC Hummer EV Multiple Warning Lights with Speed Limited to 36 MPH?

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 205+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Filter:
ALL YEARS20262025202420232022
Community reported
85 owners

Owners report a cascade of warning messages appearing simultaneously — 'One Pedal Driving Unavailable,' 'Service ESC,' 'Service Trailer Brake System,' and 'Service Active Steering System' — with the vehicle's speed limited to approximately 36 mph. The issue appears related to communication faults between the vehicle's multiple electronic control modules, particularly affecting the electric stability control and four-wheel steering systems. The Hummer EV's CrabWalk and Extract Mode features may also become disabled. The issue can occur without warning and may require a dealer visit to clear.

This issue also affects: Chevrolet Cruze, GMC Sierra 3500HD, Cadillac ELR

Common Symptoms

  • Multiple warning messages appear on the dashboard simultaneously
  • Vehicle speed limited to approximately 36 mph
  • One Pedal Driving Unavailable message
  • Service ESC warning light
  • CrabWalk and four-wheel steering features disabled

How to Fix

Pull over safely and perform a complete vehicle power-down: turn off, open and close the door, wait 3-5 minutes, then restart. If warnings persist, the vehicle needs a dealer visit for module reprogramming. Do not ignore the speed limitation — driving at highway speeds may not be safe if the ESC system is faulted. The dealer will perform a full module scan and reprogram affected control units. Multiple visits may be required as GM releases updated software calibrations.

Find a GMC dealer

Choose to share your location for this search, or enter an area below. Your search location is sent to Google to find dealers.

Open GMC dealer map in Google Maps ↗

Call to confirm they service GMC vehicles and check your VIN, recall eligibility, parts availability, and appointment options.

Typical repair cost:$0 - $300

Research This Issue

Based on 85 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence85 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026

NHTSA campaign 22V771 covers certain 2022-2023 GMC Hummer EV Pickups. The high-voltage battery-pack enclosure may not be properly sealed, allowing water to enter the pack and increasing the risk of a loss of drive power or fire.

Common Symptoms

  • Possible battery-pack water intrusion
  • Possible loss of drive power

How to Fix

Check the VIN with GMC or the EV Concierge. Follow the current manufacturer campaign instructions; the public NHTSA record states that the final remedy is under development rather than promising a specific reseal procedure.

Research This Issue

GoogleRedditYouTubeNHTSA
Manually Verified
High ConfidenceVerifiedReviewed Aug 2026

GM recalled early Hummer EV Pickup builds because certain connections inside the high-voltage Ultium battery pack may be out of position or incorrectly welded. A bad or misplaced weld inside the pack creates a high-resistance or intermittent joint between modules; under load it can open, causing an abrupt loss of drive power, and it carries thermal risk. This is distinct from the water-ingress enclosure recall on the same trucks - it is a manufacturing defect in the pack's internal busbar/module joints, not a sealing problem. The affected population is small (roughly 33 Edition 1-era pickups) and confined to the earliest production, which is consistent with the broader pattern that early 2022 Edition 1 builds differ substantially from later production. Because there is no way to repair the joint in the field, GM's remedy is a complete pack replacement.

Common Symptoms

  • Loss of drive power while driving
  • "Service High Voltage System" message
  • "Propulsion Power Reduced" warning
  • Vehicle will not restart
  • Charging disabled

How to Fix

A free recall remedy exists: under NHTSA campaign 23V367000 dealers inspect the vehicle and replace the entire high-voltage battery pack at no charge. Owner notification letters were mailed July 10, 2023. Verify by VIN at NHTSA - the campaign covers only a narrow early build range. Do not accept a software-only fix for this campaign; the remedy is hardware. Outside the recall population, a full Ultium pack replacement on this truck is one of the most expensive repairs in the catalog and is covered by the 8-year/100,000-mile propulsion battery warranty.

Typical repair cost:$0 - $0

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

One of the most frequently reported real-world failures on the Hummer EV Pickup is parasitic drain on the 12V auxiliary battery, which leaves an otherwise fully charged truck totally unresponsive - no doors, no screens, no ability to shift or start. Two mechanisms drive it. First, the truck does not always fully power down when the driver walks away: owners report having to press the start/stop button on exit or the vehicle stays awake, and a key fob left near the truck repeatedly wakes it. Second, several body and propulsion modules shipped with calibrations that drew excessive current from the 12V system, and the vehicle only polls 12V state roughly once a day, so it does not catch the decline in time to top the battery up from the high-voltage pack. Owners have documented trucks going dead after sitting six days in a garage at 90% state of charge and unplugged. Secondary symptoms once voltage sags include a "conditions unable to shift" error and assorted software malfunctions that clear after a 12V jump.

Common Symptoms

  • Truck completely dead and unresponsive after sitting several days
  • Doors will not unlock, screens will not power up
  • "Conditions unable to shift" error message
  • Random software malfunctions that clear after a 12V jump
  • Will not accept a charge when plugged in while the 12V is flat
  • Vehicle stays awake after the driver exits

How to Fix

The dealer-side fix is a full module reprogramming sweep: GM bulletin PIT6065E directs technicians to update all vehicle modules, which includes calibrations specifically changed to reduce 12V draw. Ask for that by number rather than accepting a single module flash. Short term, a 12V jump on the under-hood remote terminals will wake the truck, after which the DC-DC converter recharges the auxiliary battery from the HV pack. Behavioral mitigations owners rely on: press the power button before exiting, keep the fob well away from the truck when parked, and leave the truck plugged in when stored. A cheap Bluetooth 12V battery monitor is the standard forum recommendation for catching the decline early. If drain persists after PIT6065E, the auxiliary battery itself should be load-tested and replaced under warranty.

Typical repair cost:$0 - $450

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026
Community reported
120 owners

Some GMC Hummer EV models experience a software anomaly that prevents the vehicle from initiating the charge sequence when plugged into public DC fast chargers. The issue may be caused by oversized or damaged terminals in the charge cord connector at frequently-used stations, but a software bug also prevents the vehicle from gracefully handling connection errors. Additionally, the battery energy control module may fail to exit its commissioning (start-up) state due to the cell monitoring unit going offline, requiring a dealer software reprogram of both the battery energy control module and drive motor control module.

Common Symptoms

  • Vehicle fails to initiate charging at DC fast chargers
  • Charging session starts but immediately stops
  • Service High Voltage System warning appears
  • Vehicle enters reduced power or limp mode
  • One Pedal Driving Unavailable warning message

How to Fix

Visit a GMC dealer for the latest battery energy control module and drive motor control module software updates. If charging fails at a public station, try a different charger or use Level 2 AC charging as a workaround. For the commissioning state issue, a dealer reprogram of the BECM and DMCM is required. GM has released multiple software updates addressing these issues — ensure your vehicle has the latest calibration files installed.

Typical repair cost:$0 - $200

Research This Issue

Based on 120 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence120 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026

GM bulletin 10217073 covers specified 2022 GMC Hummer EV Pickups and directs technicians to inspect the X500 electrical connector for corrosion.

Common Symptoms

  • Door electrical functions may be affected when the X500 connector corrodes

How to Fix

A GMC dealer inspects and repairs the X500 connector when corrosion is present and reseals the relevant body panels under the bulletin whether or not connector corrosion is found.

Research This Issue

GoogleRedditYouTubeNHTSA
Manually Verified
High ConfidenceVerifiedReviewed Aug 2026

GM recalled 2023-2024 GMC Hummer EV Pickups (along with the 2024 Hummer EV SUV and 2024 Silverado EV built in the same Factory ZERO plant) because the left or right front seat belt buckle attachment bolts may not have been tightened to the specified torque during assembly. An under-torqued buckle anchor can loosen or pull under crash loading, so the belt may not restrain the occupant as designed. Roughly 115 Hummer EV Pickups fall inside the affected build window. This is an assembly-torque escape rather than a design defect, and there is no reliable driveability symptom - an owner generally cannot detect it without inspecting the buckle anchor, which makes VIN verification the only practical check.

Common Symptoms

  • Front seat belt buckle feels loose in its mount
  • Buckle stalk moves or rattles at the floor anchor
  • No warning light - defect is not detectable by the driver in normal use

How to Fix

A free recall remedy exists: under NHTSA campaign 23V786000 (GM number N232419280) dealers inspect and tighten the left and right front seat belt buckle attachment bolts to specification at no charge. Owner notification letters were mailed January 8, 2024. This is a short shop visit. Owners who bought used should run the VIN through NHTSA's recall lookup, since the truck may have changed hands before the recall was performed.

Typical repair cost:$0 - $0

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

GM recalled 2026 GMC Hummer EV Pickup and SUV vehicles because the front passenger airbag connection in the instrument-panel wiring harness may contain an improperly crimped wire. The defect traces to a three-day period in July 2025 when the supplier's (Yazaki North America) automated crimping equipment was down for maintenance and a manual backup crimping process produced inconsistent terminal connections. A bad crimp can interrupt or degrade the deployment signal to the passenger airbag, so the bag may not deploy in a frontal crash. Of the 354 total vehicles recalled, 109 are Hummer EV Pickups. Affected vehicles were built between July 31 and October 24, 2025. GM found the problem internally on August 21, 2025 when a loose wire was spotted during assembly; no field incidents or injuries were reported before the recall was filed.

Common Symptoms

  • Airbag readiness warning light illuminated
  • Passenger airbag status indicator reads OFF with an adult passenger seated
  • Stored SRS fault for the passenger airbag deployment loop
  • No symptom at all in some affected vehicles

How to Fix

A free recall remedy exists: under NHTSA campaign 25V769000 dealers install a jumper harness that replaces the affected section of the instrument-panel wire harness, at no charge. Because the defect can present with no dash warning at all in some cases, do not rely on the passenger airbag status indicator as proof the truck is unaffected - verify the VIN against the NHTSA recall lookup. If the airbag readiness light is on or the passenger airbag status shows OFF with an adult occupant seated, stop relying on that seat until the harness is inspected.

Typical repair cost:$0 - $0

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

Hummer EV Pickup owners report that Super Cruise, a headline feature of the truck, works inconsistently - repeatedly refusing to engage on the same stretches of interstate and tollway where it worked before, and dropping out mid-drive. The dash messaging varies between "Super Cruise Not Available" and "No Road Information." Two distinct causes appear in owner reports and dealer diagnosis. The first is connectivity: the system depends on the OnStar/AT&T data connection to pull map and GPS correction data, and in weak-coverage areas it will not arm; owners describe being bounced between GM, OnStar and the dealer with each blaming the others, and some trucks needed the Super Cruise activation/subscription state fixed on the back end before the feature would work at all. The second is the module itself - dealers have applied a Super Cruise module software update under bulletin 24-NA-143, and in some cases replaced the Super Cruise module outright and reflashed it to the newest patch, which resolved the dropouts.

Common Symptoms

  • "Super Cruise Not Available" message on mapped highways
  • "No Road Information" message
  • Super Cruise disengages unexpectedly mid-drive
  • Super Cruise icon never turns green
  • Feature missing entirely after delivery (activation not provisioned)

How to Fix

Start by confirming the Super Cruise subscription/activation state is actually provisioned on the account - a meaningful share of "it never worked" cases are back-end provisioning, not hardware. Then have the dealer apply the Super Cruise module software update per GM bulletin 24-NA-143 and update all related modules. If dropouts persist on roads that are confirmed to be in the mapped LiDAR network, the remedy that has worked is replacing the Super Cruise module and flashing it to the latest calibration - a warranty repair. Note that Super Cruise legitimately will not engage on unmapped roads, in construction zones, with obscured lane markings, or when the driver-attention camera is blocked, so rule those out before treating it as a defect.

Typical repair cost:$0 - $1,500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

The first recall ever issued against the Hummer EV Pickup covered embedded software in the microcontroller inside the LED taillamp assembly. The fault can leave one or both taillamps inoperative, or stuck fully or partially illuminated. Because the Hummer EV's rear lighting functions are all integrated into a single assembly, an inoperative taillamp takes the brake light, turn signal, backup lamp, side marker, clearance lamp and running lamp with it - the truck loses essentially all rear signaling on that side, which is a non-compliance with FMVSS 108, not just a nuisance. GM received three confirmed field complaints between January 8 and February 7, 2022 on vehicles built October 5, 2021 through January 20, 2022. The affected population is tiny (10 vehicles), reflecting how few Edition 1 trucks had been delivered at that point.

Common Symptoms

  • One or both taillamps completely inoperative
  • Taillamp stays fully or partially illuminated with the vehicle off
  • Brake light, turn signal or reverse lamp dead on one side
  • Lamp-out warning message in the cluster

How to Fix

A free recall remedy exists: under NHTSA campaign 22V141000 dealers inspect and, where necessary, replace the left and/or right rear taillamp assembly at no charge. Because the fault lives in the lamp's own microcontroller, the fix is assembly replacement rather than a software flash. GM contacted these owners directly and all 10 vehicles were repaired. If a later-build truck shows the same symptom it is not covered by this campaign and the lamp assembly is a warranty claim under the bumper-to-bumper term.

Typical repair cost:$0 - $0

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

The $3,695 hard power-retractable tonneau cover offered on the Hummer EV Pickup - a pickup-only option that does not exist on the SUV - has a documented failure of its drive motor and its electronic control unit. Affected covers stop responding to the in-bed buttons, the interior switch and the app entirely, regardless of whether the truck is on, off, locked or unlocked; some owners report the cover going to sleep and needing repeated resets before failing outright, and others report the cover jamming in the closed position and locking cargo in the bed. A fast-flashing indicator on the tonneau switch is the common tell that the ECU has faulted rather than the motor simply stalling. Heat appears to aggravate the failure - several reports describe the cover refusing to operate in high ambient temperatures. GM covered the condition with a service update spanning 2022 through 2024 pickups.

Common Symptoms

  • Power tonneau cover will not open or close
  • No response from the bed buttons or in-cab switch
  • Fast-flashing indicator light on the tonneau control
  • Cover stuck closed with cargo inside
  • Cover works intermittently, worse in hot weather

How to Fix

GM Service Update N232434060 covers 2022-2024 Hummer EV Pickups with a power tonneau cover that will not open or close: dealers inspect and replace the tonneau ECU or the tonneau cover motor as necessary, at no charge. This is a service update rather than a safety recall, so it is not on the NHTSA VIN lookup - ask the dealer to check the VIN against open field actions in GM's system. Before booking, try the documented manual override/reset procedure in GM's Power Tonneau troubleshooting guide, which resolves the sleep-state cases without parts. Out of warranty, motor and ECU replacement runs several hundred to roughly a thousand dollars in parts plus labor.

Find a GMC dealer

Choose to share your location for this search, or enter an area below. Your search location is sent to Google to find dealers.

Open GMC dealer map in Google Maps ↗

Call to confirm they service GMC vehicles and check your VIN, recall eligibility, parts availability, and appointment options.

Typical repair cost:$0 - $1,200

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

The Hummer EV Pickup's signature Infinity Roof uses four removable transparent panels retained by structural cross members owners call the I-bars. On early trucks the seals around the front and rear I-bars and the center lift-off panel weatherstrip collect water in a channel instead of draining it, so water pools and then runs into the cabin - typically down onto the headliner, the front seats and the center console area. Owners documented this extensively on HummerChat starting with an Edition 1 truck at roughly 800 miles, and the volume of reports pushed GM to issue a dealer-level Customer Satisfaction Program plus a follow-up service bulletin specifically covering water leaks at the center roof lift-off panel insert and the center roof lift-off rear panel weatherstrip. This is separate from the A-pillar and battery-enclosure water paths - the entry point here is the roof structure itself, and it soaks interior trim and electronics rather than the pack.

Common Symptoms

  • Water dripping from the roof area into the cabin after rain or a car wash
  • Wet headliner, sun visors, seats or center console
  • Water pooling around the removable roof panel I-bars
  • Musty smell or damp carpet
  • Water stains on A-pillar and roof trim

How to Fix

GM's fix is a warranty/Customer Satisfaction Program repair at no cost to the owner: dealers replace the front and rear I-bars with redesigned parts that use different seals and no water-collecting channels, and where the leak is at the center panel, replace the center roof lift-off panels and/or the rear panel weatherstrip per the later service bulletin. Labor is roughly an hour for the center panel replacement. Do not let a dealer treat this as a sealant/adhesive touch-up - the redesigned I-bar hardware is the actual remedy. Have any soaked headliner, carpet and door-trim wiring dried and inspected at the same visit, since standing water in this truck has been associated with downstream electrical faults.

Typical repair cost:$0 - $600

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

GM bulletin PIT6144G documents 2022-2025 GMC Hummer EV owners reporting that the air leveling suspension stops working, with a "Service Leveling System" message in the driver display and DTC C1197 SYM92 stored in the automatic level control module. On a truck that weighs over 9,000 pounds and relies on the air springs for both ride height selection (including Extract Mode and off-road heights) and automatic load leveling, a dead compressor leaves the vehicle stuck at a fixed height and unable to compensate for payload. GM identifies two causes: a plugged or pinched air inlet hose feeding the air suspension compressor assembly, and a software condition in the automatic level control module. Separately, owners have documented rear dampers losing fluid after moderate off-road use - one 2024 pickup took two months at the dealer to diagnose a right-rear damper leak, which was then covered under warranty. Fitting oversize (38-inch) tires has been reported to destabilize the system further and is not a supported configuration.

Common Symptoms

  • "Service Leveling System" message in the driver information center
  • Air suspension will not raise or lower
  • Vehicle stuck at one ride height
  • Extract Mode and off-road height settings unavailable
  • Rear of the truck sags under load
  • Bouncy, uncontrolled ride (leaking damper variant)

How to Fix

Have the dealer follow PIT6144G. The first step is inspecting the air inlet hose to the compressor assembly for a pinch or blockage and clearing/rerouting it; if the hose is clear, the remedy is a software update to the automatic level control module. Both are warranty repairs on a truck inside the 3-year/36,000-mile bumper-to-bumper term. If ride quality is bouncy or uncontrolled rather than the height being stuck, that points at a leaking damper instead - have the dampers inspected for fluid loss, which is also a warranty item. Do not chase this with aftermarket compressor parts before the bulletin has been run; the inlet-hose cause is cheap to fix and commonly missed.

Typical repair cost:$0 - $1,800

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

EXTERIOR LIGHTING:TAIL LIGHTS

General Motors, LLC (GM) is recalling certain 2022 GMC Hummer EV vehicles. Taillight software can cause one or both rear taillights to become inoperative, or remain fully or partially illuminated. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."

Campaign #22V14100010/03/2022

ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

General Motors, LLC (GM) is recalling certain 2022 GMC Hummer EV and 2023 Cadillac Lyriq vehicles. Certain connections within the high-voltage battery pack may be out of position or incorrectly welded, which can cause a loss of drive power.

Campaign #23V36700025/05/2023

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

get a full repair guide

Owners report a cascade of warning messages appearing simultaneously — 'One Pedal Driving Unavailable,' 'Service ESC,' 'Service Trailer Brake System,' and 'Service Active Steering System' — with the vehicle's speed limited to approximately 36 mph. The issue appears related to com… Repairs typically run $0-$300. Severity: high.

What is the 2022-2023 GMC Hummer EV Battery Pack Enclosure Water Ingress?

NHTSA campaign 22V771 covers certain 2022-2023 GMC Hummer EV Pickups. The high-voltage battery-pack enclosure may not be properly sealed, allowing water to enter the pack and increasing the risk of a loss of drive power or fire. Severity: high.

What is the 2023-2024 GMC Hummer EV Front Seat Belt Buckle Attachment Bolts Not Tightened to Specification (Recall 23V786)?

GM recalled 2023-2024 GMC Hummer EV Pickups (along with the 2024 Hummer EV SUV and 2024 Silverado EV built in the same Factory ZERO plant) because the left or right front seat belt buckle attachment bolts may not have been tightened to the specified torque during assembly. An und… Repairs typically run $0-$0. Severity: high.

What is the 2022-2023 GMC Hummer EV High-Voltage Battery Pack Internal Connections Mispositioned or Incorrectly Welded (Recall 23V367)?

GM recalled early Hummer EV Pickup builds because certain connections inside the high-voltage Ultium battery pack may be out of position or incorrectly welded. A bad or misplaced weld inside the pack creates a high-resistance or intermittent joint between modules; under load it c… Repairs typically run $0-$0. Severity: high.

What is the 2022-2025 GMC Hummer EV 12-Volt Auxiliary Battery Drain Leaves the Truck Completely Dead While Parked?

One of the most frequently reported real-world failures on the Hummer EV Pickup is parasitic drain on the 12V auxiliary battery, which leaves an otherwise fully charged truck totally unresponsive - no doors, no screens, no ability to shift or start. Two mechanisms drive it. First… Repairs typically run $0-$450. Severity: high.

What is the 2026 GMC Hummer EV Front Passenger Airbag Harness Improper Wire Crimp Prevents Deployment (Recall 25V769)?

GM recalled 2026 GMC Hummer EV Pickup and SUV vehicles because the front passenger airbag connection in the instrument-panel wiring harness may contain an improperly crimped wire. The defect traces to a three-day period in July 2025 when the supplier's (Yazaki North America) auto… Repairs typically run $0-$0. Severity: high.

What is the 2022-2024 GMC Hummer EV Public Charging Failures and Software Anomalies?

Some GMC Hummer EV models experience a software anomaly that prevents the vehicle from initiating the charge sequence when plugged into public DC fast chargers. The issue may be caused by oversized or damaged terminals in the charge cord connector at frequently-used stations, but… Repairs typically run $0-$200. Severity: medium.

What is the 2022-2024 GMC Hummer EV A-Pillar Water Leak Disables Door Switches?

GM bulletin 10217073 covers specified 2022 GMC Hummer EV Pickups and directs technicians to inspect the X500 electrical connector for corrosion. Severity: medium.

What is the 2022 GMC Hummer EV Taillamp Microcontroller Software Fault Disables All Rear Lighting Functions (Recall 22V141)?

The first recall ever issued against the Hummer EV Pickup covered embedded software in the microcontroller inside the LED taillamp assembly. The fault can leave one or both taillamps inoperative, or stuck fully or partially illuminated. Because the Hummer EV's rear lighting funct… Repairs typically run $0-$0. Severity: medium.

What is the 2022-2025 GMC Hummer EV Super Cruise Intermittently Unavailable or Drops Out on Previously Mapped Roads?

Hummer EV Pickup owners report that Super Cruise, a headline feature of the truck, works inconsistently - repeatedly refusing to engage on the same stretches of interstate and tollway where it worked before, and dropping out mid-drive. The dash messaging varies between "Super Cru… Repairs typically run $0-$1,500. Severity: medium.

What is the 2022-2023 GMC Hummer EV Infinity Roof Removable Panel I-Bar Seals Leak Water Into the Cabin?

The Hummer EV Pickup's signature Infinity Roof uses four removable transparent panels retained by structural cross members owners call the I-bars. On early trucks the seals around the front and rear I-bars and the center lift-off panel weatherstrip collect water in a channel inst… Repairs typically run $0-$600. Severity: medium.

What is the 2022-2025 GMC Hummer EV Air Ride Adaptive Suspension Inoperative with "Service Leveling System" (DTC C1197)?

GM bulletin PIT6144G documents 2022-2025 GMC Hummer EV owners reporting that the air leveling suspension stops working, with a "Service Leveling System" message in the driver display and DTC C1197 SYM92 stored in the automatic level control module. On a truck that weighs over 9,0… Repairs typically run $0-$1,800. Severity: medium.

What is the 2022-2024 GMC Hummer EV Power Retractable Tonneau Cover Motor / ECU Failure Leaves Bed Cover Stuck?

The $3,695 hard power-retractable tonneau cover offered on the Hummer EV Pickup - a pickup-only option that does not exist on the SUV - has a documented failure of its drive motor and its electronic control unit. Affected covers stop responding to the in-bed buttons, the interior… Repairs typically run $0-$1,200. Severity: low.