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According to Au7o's analysis of 2,450+ owner reports, the 2020 Mazda CX-30 has 12 documented known issues, with 3 rated critical. The most serious are Torque Converter Lock-Up Clutch Wear Contaminating ATF with Iron Powder - Chirp on 3-4 Upshift (TSB 05-005/23) ($1,500-$3,200 repair), Front Brake Caliper Mounting Bolts Loosen and Fall Out - Reduced Braking - Recall 20V346000 (4420F) ($0-$0 repair) and Disconnected Fuel Evap Vent Hose Causing Fuel Leak / Stalling (AWD) - Recall 20V347000 (4520F). The most commonly reported issue is Infotainment System Freezing / CarPlay Disconnecting with 1,800 owner reports. Across all issues with published estimates, repair costs range from $400 to $3,200. DIY maintenance guides at au7o.io.
All 12 Known Issues
NHTSA Recalls5 recalls
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
Mazda North American Operations (Mazda) is recalling certain 2022-2023 CX-30 and 2023 CX-50 vehicles. The anti-lock brake system (ABS) Hydraulic Control Unit (HCU) may be damaged, which can result in reduced braking ability.
Campaign #23V27500018/04/2023
AIR BAGS: AIR BAG/RESTRAINT CONTROL MODULE:SOFTWARE
Mazda North American Operations is recalling certain 2024-2025 Mazda3 and CX30 vehicles. The Sophisticated Air Bag Sensor (SAS) units may set an error code and deactivate the air bags, due to a low battery condition.
Campaign #25V35700029/05/2025
LANE DEPARTURE: SENSING SYSTEM: CAMERA
Mazda North American Operations (Mazda) is recalling certain 2024 Mazda 3, CX-30, and 2025 CX-50 vehicles. A malfunction in the forward sensing camera (FSC) may prevent the automatic emergency braking system and the lane-keep assist system from functioning. In addition, the headlights will not automatically adjust from high beams to low beams as intended.
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According to Au7o's analysis of 2,450+ owner reports, the 2020 Mazda CX-30 has 12 documented issues. The most frequently reported are: Torque Converter Lock-Up Clutch Wear Contaminating ATF with Iron Powder - Chirp on 3-4 Upshift (TSB 05-005/23), Front Brake Caliper Mounting Bolts Loosen and Fall Out - Reduced Braking - Recall 20V346000 (4420F), Disconnected Fuel Evap Vent Hose Causing Fuel Leak / Stalling (AWD) - Recall 20V347000 (4520F). Of these, 3 are rated critical and should be addressed promptly.
Is the Mazda CX-30 reliable?
The 2020 Mazda CX-30 has 12 known issues documented across 2,450+ owner reports. 3 issues are rated critical: Torque Converter Lock-Up Clutch Wear Contaminating ATF with Iron Powder - Chirp on 3-4 Upshift (TSB 05-005/23) and Front Brake Caliper Mounting Bolts Loosen and Fall Out - Reduced Braking - Recall 20V346000 (4420F) and Disconnected Fuel Evap Vent Hose Causing Fuel Leak / Stalling (AWD) - Recall 20V347000 (4520F). 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 Mazda CX-30 problems?
Repair costs for known Mazda CX-30 issues range from $0 to $3,200, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Torque Converter Lock-Up Clutch Wear Contaminating ATF with Iron Powder - Chirp on 3-4 Upshift (TSB 05-005/23), typically costs $1,500-$3,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2020-2024 Mazda CX-30 Torque Converter Lock-Up Clutch Wear Contaminating ATF with Iron Powder - Chirp on 3-4 Upshift (TSB 05-005/23)?
On CX-30 models with the 2.5L SkyActiv-G equipped with cylinder deactivation and the 6-speed automatic transaxle, the torque converter lock-up clutch wears excessively. The cylinder-deactivation calibration locks the converter up early and often, and the single-plate clutch uses… Repairs typically run $1,500-$3,200. Severity: high.
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.
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On the 2020-2024 Mazda CX-30 2.5L SkyActiv-G with cylinder deactivation (PY-VPS), on CX-30 models with the 2.5L SkyActiv-G equipped with cylinder deactivation and the 6-speed automatic transaxle, the torque converter lock-up clutch wears excessively. The cylinder-deactivation calibration locks the converter up early and often, and the single-plate clutch uses an aggressive high-metal-content friction material to survive it. The resulting iron powder contaminates the automatic transaxle fluid and embeds in the clutch pack that engages in 4th, producing a distinct chirp or stick-slip squeal on the 3-4 upshift - mechanically the same way a contaminated brake pad squeals. Mazda documented this in bulletin 05-005/23 covering 2020-2024 CX-30 along with other 2.5L CD applications. This is a wear-and-contamination failure, separate from the cylinder-deactivation shudder and the valvetrain rattle already catalogued.
Common Symptoms
Chirp or squeak from the transmission on the 3-4 upshift
Stick-slip noise under light throttle at cruising speed
Noise most noticeable when the transmission is warm
Slight shudder or vibration accompanying the noise
Dark or metallic-smelling automatic transaxle fluid
How to Fix
Diagnosis is by the characteristic chirp on the 3-4 shift; dealers confirm iron contamination in the ATF. The documented repair is torque converter replacement together with an ATF flush - at one point parts were constrained enough that dealers had to submit a MASH Hotline file and a MNAO PUSH order to obtain them, and some vehicles required transaxle replacement. There is no safety recall and no free remedy outside the powertrain warranty; in-warranty vehicles are covered. Out of warranty, expect torque converter and fluid service costs. An early ATF change will not reverse clutch wear that has already occurred.
On the 2020 Mazda CX-30, certain 2020 CX-30 vehicles built October 22, 2019 through March 6, 2020 left the plant with front brake caliper mounting bolts that were not torqued to specification. Over time the bolts back out and can fall off entirely. A loose caliper produces a long, soft pedal and reduced braking force; a fully detached caliper can rotate into the wheel and jam it, causing loss of vehicle control. NHTSA campaign 20V346000 (Mazda Safety Recall 4420F) covers roughly 16,233 CX-30 units alongside about 7,804 Mazda3 units - this is a genuine safety recall, not a service alert. Note the shared assembly-line cause with the Mazda3; NHTSA names both nameplates explicitly.
Common Symptoms
Clunking or knocking noise from the front wheel when braking
Grinding or scraping from a front wheel while rolling
Soft or long brake pedal travel
Increased stopping distance
Vehicle pulls to one side under braking
Rattling from the front suspension area at low speed
How to Fix
Free recall remedy. Dealers inspect both front brake caliper mounting bolts and re-torque them to specification. If a bolt is missing or damaged the affected brake caliper assembly is replaced at no charge. Owners can verify eligibility by VIN at nhtsa.gov/recalls or with Mazda customer service (1-800-222-5500). Owner notification began July 24, 2020. Any vehicle showing a clunking or grinding front brake should be inspected before further driving.
On the 2020 Mazda CX-30, on 2020 CX-30 AWD models, the fuel evaporative vent hose may be disconnected from the fuel sender unit due to a fuel-tank plant manufacturing error. After a full fill-up, liquid fuel can flood the charcoal canister and leak from the rear of the vehicle, creating a fire risk near an ignition source; the engine can also stall while driving.
Common Symptoms
Fuel smell or visible fuel leak from rear of vehicle after a full tank fill-up
Engine stalls while driving
Liquid fuel overflowing the EVAP charcoal canister
Emissions/check-engine warning
How to Fix
Recall 20V347000 (Mazda campaign 4520F) covers ~12,097 AWD vehicles. Dealers inspect the evaporative vent hose in the fuel tank, reconnect it if disconnected, and replace the charcoal canister and related parts, free of charge. Recall began July 29, 2020.
On the 2020-2025 Mazda CX-30, the Mazda Connect infotainment system in CX-30 frequently freezes, reboots, or loses Apple CarPlay/Android Auto connection. Issues are exacerbated by certain phone models and iOS/Android updates. Wireless CarPlay implementations are particularly unstable. Firmware updates from Mazda have improved but not fully resolved the issue.
Common Symptoms
Infotainment screen freezes and becomes unresponsive
Apple CarPlay or Android Auto disconnects mid-use
System reboots randomly while navigating
Audio cuts out and does not resume until restart
Backup camera display blank after system reboot
How to Fix
Update to the latest Mazda Connect firmware. Ensure phone software is current. For persistent issues, try a different USB cable (MFi-certified for Apple). Some owners report improvement after CMU module replacement. Disabling wireless CarPlay in favor of wired connection improves stability.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Anker A8153 six-foot MFi USB-A to Lightning data cable
OEMAnker A8153
Rule out a damaged or non-data Lightning cable during wired Apple CarPlay diagnosis Fitment/availability: Indexed direct item page identifies Anker A8153, USB-A to Lightning, six-foot, MFi-certified data transfer, sold by AnkerDirect, sh…
High ConfidenceVerified1,800 owner reportsLast reported by owners Jan 2025Reviewed Feb 2026
On the 2020-2024 Mazda CX-30, mazda issued Special Service Program SSPC5 for the CX-30 covering multiple control-module reprogramming concerns, the first of which is a battery concern: the climate control unit (CCU) and body control module (BCM) may not transition into sleep mode after the ignition is switched OFF. The modules stay awake and draw current continuously, flattening the 12V battery over a few days of non-use. Owners report the low-battery warning after short parking periods, no-start conditions, and in several documented cases repeated tow-ins with batteries that still pass Mazda's own load specification - the classic signature of a parasitic draw rather than a failed battery. Complaints persist on later model years beyond the original SSPC5 population, and the i-stop system's sensitivity to state of charge makes the symptom show up early as i-stop simply refusing to work. Note this is distinct from recall 25V357, which concerns what the air bag sensor does after a battery is already dead.
Common Symptoms
Battery management low-charge warning message after the car sits a few days
No-start or slow crank after short periods of non-use
i-stop auto start-stop stops functioning
Repeated battery replacements that do not cure the problem
Battery tests good but goes flat again
Electrical accessories reset or behave erratically after a flat battery
How to Fix
For vehicles covered by SSPC5, Mazda dealers reprogram the CCU and BCM (a USB flash-drive software update taking roughly 7 minutes) free of charge; U.S. owners were notified by mail no later than April 17, 2021. This is a Special Service Program, not a safety recall, so it is not VIN-searchable on NHTSA - ask the dealer to check SSPC5 eligibility by VIN. For vehicles outside the program, have a parasitic draw test performed with the modules allowed to time out before condemning the battery; many owners report the drain warning stops after fitting a higher-quality replacement battery, but that treats the symptom rather than the module sleep fault.
On the 2020-2021 Mazda CX-30, cX-30 vehicles equipped with the optional Bose audio system may emit a loud static or buzzing noise from some or all speakers, caused by an inappropriate control program in the audio amplifier. The noise occurs independently of what is playing and independently of driving status or whether the engine is running - owners describe a bizarre buzzing with the source muted or off. Mazda addressed it with Special Service Program SSPC4, an amplifier software update applied to Bose-equipped cars regardless of whether the owner had complained. Some vehicles were initially given a replacement amplifier before Mazda traced the fault to amplifier firmware, so a hardware swap is not the correct first step.
Common Symptoms
Loud static or white noise from one or more speakers
Buzzing from the speakers when nothing is playing
Noise present with the audio system muted or off
Noise present with the engine off and ignition on
Intermittent, not repeatable on demand
How to Fix
Free Special Service Program SSPC4 at a Mazda dealer: an audio amplifier software update delivered by USB. As with SSPC5 this is a Special Service Program rather than a safety recall, so it will not appear in a NHTSA VIN lookup - ask the dealer to check SSPC4 eligibility by VIN. Amplifier replacement should only be considered if the noise persists after the firmware update is confirmed applied. SSPC4 is commonly performed alongside SSPC5 in a single visit.
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On the 2020-2021 Mazda CX-30, on affected 2020-2021 CX-30s, the fully-opened power liftgate can partially lower on its own when the vehicle is parked facing uphill on a slope. Mazda traces it to insufficient frictional retaining force in certain power liftgate drive motor units combined with reduced support-spring force in high ambient temperatures, so a person reaching into the cargo area can be struck.
Common Symptoms
Open liftgate slowly drops or sags on its own
Liftgate won't stay fully raised when parked nose-up on an incline
Worse in hot weather
How to Fix
Recall 21V086000 (Mazda campaign 4621B) covers ~13,857 vehicles. Dealers reflash the power liftgate control module software and inspect the liftgate drive unit serial number, replacing the drive unit if necessary, free of charge. Recall began April 8, 2021.
On the 2020-2021 Mazda CX-30, 2020-2021 CX-30 vehicles leak water into the passenger compartment from the rear doors, entering at the bottom of the service hole behind the rear door trim panel. Mazda identified two causes: the service hole cover's seal rubber lacks resistance to surfactants and deteriorates when the vehicle is washed with detergent, and separately the lower tabs of the service hole cover may not have been fully engaged during factory assembly. Water tracks down inside the door, past the failed seal, and pools in the rear footwell carpet. Mazda documented the repair in bulletin 09-020/21 (with related revisions in the 09-039/20 and R089/20 series) and changed the service-hole cover seal material in mass production. Owners typically discover it as a damp or soaked rear carpet and a persistent musty smell after heavy rain or a car wash.
Common Symptoms
Wet or soaked carpet in the rear passenger footwell
Water intrusion after rain or after washing the vehicle
Musty or mildew smell inside the cabin
Damp rear door trim panel or water marks on the door card
Fogged windows that will not clear
Water sloshing sound from inside a rear door
How to Fix
Under the bulletin, dealers replace the rear door service hole covers with the revised parts and re-seal them with new butyl tape. Any technician removing a rear door trim panel on these cars should apply fresh butyl tape to the service hole cover on reassembly rather than reusing the original seal. There is no safety recall and no free campaign remedy - the repair is warranty-covered within the basic warranty period. Wet carpet and underlay should be pulled and dried to prevent mould and corrosion of floor-mounted connectors; drying alone without replacing the cover will not stop the leak.
On the 2020-2025 Mazda CX-30, the A/C condenser in the CX-30 is prone to developing pinhole leaks from road debris impact and corrosion. The condenser sits exposed behind the front grille with minimal protection. Refrigerant loss causes gradual A/C performance degradation until the system stops cooling entirely.
Common Symptoms
A/C blows warm air gradually worsening over weeks
A/C works intermittently - cool in morning, warm in afternoon
Visible oily residue on A/C condenser (refrigerant leak)
A/C compressor cycles on and off rapidly (low charge)
How to Fix
Replace A/C condenser and recharge system with R-134a refrigerant. Install a condenser stone guard or grille screen to protect from future debris impact. Check for secondary leaks at hose connections during replacement.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
TYC 30143 A/C condenser with receiver-drier
OEMTYC 30143
Replace a confirmed leaking condenser on the naturally aspirated CX-30 branch Fitment/availability: Live direct page identifies TYC 30143 for 2020-2025 Mazda CX-30 naturally aspirated applications, built-in receiver/drier, 12 in stock an…
Genuine Mazda BDWK-61-480B A/C condenser with drier
OEMMazda BDWK-61-480B
Replace a confirmed leaking condenser on the 2021-2025 CX-30 2.5 Turbo branch Fitment/availability: Indexed direct dealer item page identifies BDWK-61-480B for 2021-2025 CX-30 with 2.5L turbo, includes the drier, and showed sale price/Ad…
High ConfidenceVerified650 owner reportsLast reported by owners Dec 2024Reviewed Feb 2026
On the 2020-2025 Mazda CX-30, cX-30s with the 2.5L naturally aspirated SkyActiv-G equipped with cylinder deactivation can develop a tapping/rattling noise from the valve train area. Mazda traces it to the switchable hydraulic lash adjusters (HLAs) used by cylinder deactivation, which malfunction when air bubbles accumulate in the oil passage. Note: cylinder deactivation was offered on 2020 and again 2023-2025 CX-30s (not 2021-2022).
Common Symptoms
Tapping or rattling from the valve train / top of engine
Noise more noticeable at idle or low rpm
Vibration or shudder when cylinder deactivation engages
How to Fix
Per Mazda Service Alert SA-026/23, the procedure is to purge trapped air (running the engine at ~2,500-3,000 rpm) and, where the noise persists, replace the switchable HLAs with a revised version (a revised service cylinder head assembly has also been established) to reduce air entrapment.
On the 2020-2025 Mazda CX-30, cX-30 owners report the i-Activsense automatic emergency braking system activating with no real obstacle (phantom braking) or grabbing when maneuvering around vehicles at low speed, with the system noticeably more sensitive than rivals even at its lowest setting. Owners also report combined brake-system and i-Activsense malfunction messages with driver-assist features partially disabled, sometimes attributed by dealers to sensors overheating in hot weather.
Common Symptoms
Automatic emergency braking activates with no real obstacle (phantom braking)
Brakes grab when maneuvering around cars/obstacles at low speed
Brake system and i-Activsense malfunction messages appear together
Driver-assist systems show as partially disabled
Sometimes attributed to sensor overheating in hot weather
How to Fix
For false AEB activation, owners can lower sensitivity or temporarily cancel via the i-Activsense switch. No formal Mazda recall/TSB has been published specifically for CX-30 phantom braking; for the malfunction-message cluster, dealers inspect the front sensors/ABS wheel speed sensors and wiring. This issue is documented through owner complaints and forums rather than an official campaign.
On the 2020 Mazda CX-30, early-production 2020 CX-30 vehicles built before October 15, 2019 exhibit a rattle from the front suspension when driving over bumps or wavy road surfaces. Mazda traced it to the strut upper mounting rubber: insufficient clearance between the rubber and the metal bracket of the mounting rubber during assembly lets the two knock against each other over suspension travel. The mounting rubber was modified in production to restore the correct clearance. Bulletin 02-004/21 (issued February 22, 2021, superseding earlier revisions) covers the 2020 CX-30 and 2019-2020 Mazda3. A follow-on step in the bulletin family addresses vehicles built before January 1, 2022 where the mounting rubber replacement alone does not resolve the noise. Owner threads separately report clunking and knocking over rough pavement, and Mazda issued related bulletins for front suspension rattle (SA-057/22) and oil weeping from front struts (02-004/22a) - so a rattling front end on these cars is worth inspecting for a leaking damper as well.
Common Symptoms
Rattle from the front suspension over bumps
Knocking or clunking on wavy or broken pavement
Noise absent on smooth roads
Noise from the top of the strut tower area
Oil film or weeping visible on the front strut body
How to Fix
Under bulletin 02-004/21 dealers replace the front strut upper mounting rubbers with the modified parts. Where the noise persists on vehicles produced before January 1, 2022, the documented escalation is replacement of both front strut dampers. Warranty-covered within the basic warranty period; there is no recall and no free campaign remedy outside warranty. Before authorizing strut replacement, have the technician confirm the noise source and check for oil weeping on the damper bodies, which Mazda covers under a separate bulletin.
Mazda North American Operations (Mazda) is recalling certain 2020-2021 CX-30 vehicles. When fully opened, the power liftgate may partially lower unexpectedly when the vehicle is parked facing uphill on a slope.
Campaign #21V08600018/02/2021
TIRES:VALVE
Mazda North American Operations (Mazda) is recalling certain 2021 Mazda3 and CX-30 vehicles. Air may suddenly leak from the tire air valve.
Campaign #21V10100022/02/2021
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
What is the 2020 Mazda CX-30 Front Brake Caliper Mounting Bolts Loosen and Fall Out - Reduced Braking - Recall 20V346000 (4420F)?
Certain 2020 CX-30 vehicles built October 22, 2019 through March 6, 2020 left the plant with front brake caliper mounting bolts that were not torqued to specification. Over time the bolts back out and can fall off entirely. A loose caliper produces a long, soft pedal and reduced… Repairs typically run $0-$0. Severity: high.
What is the 2020 Mazda CX-30 Disconnected Fuel Evap Vent Hose Causing Fuel Leak / Stalling (AWD) - Recall 20V347000 (4520F)?
On 2020 CX-30 AWD models, the fuel evaporative vent hose may be disconnected from the fuel sender unit due to a fuel-tank plant manufacturing error. After a full fill-up, liquid fuel can flood the charcoal canister and leak from the rear of the vehicle, creating a fire risk near… Severity: high.
What is the 2020-2025 Mazda CX-30 Infotainment System Freezing / CarPlay Disconnecting?
The Mazda Connect infotainment system in CX-30 frequently freezes, reboots, or loses Apple CarPlay/Android Auto connection. Issues are exacerbated by certain phone models and iOS/Android updates. Wireless CarPlay implementations are particularly unstable. Firmware updates from Ma… Repairs typically run $0-$800. Severity: medium.
What is the 2020-2025 Mazda CX-30 A/C Condenser Leak?
The A/C condenser in the CX-30 is prone to developing pinhole leaks from road debris impact and corrosion. The condenser sits exposed behind the front grille with minimal protection. Refrigerant loss causes gradual A/C performance degradation until the system stops cooling entire… Repairs typically run $400-$900. Severity: medium.
What is the 2020-2025 Mazda CX-30 Cylinder Deactivation Valvetrain Tapping/Rattle (Switchable HLA Air Entrapment) - SA-026/23?
CX-30s with the 2.5L naturally aspirated SkyActiv-G equipped with cylinder deactivation can develop a tapping/rattling noise from the valve train area. Mazda traces it to the switchable hydraulic lash adjusters (HLAs) used by cylinder deactivation, which malfunction when air bubb… Severity: medium.
What is the 2020-2025 Mazda CX-30 i-Activsense False Emergency Braking & Spurious Brake/Driver-Assist Warnings?
CX-30 owners report the i-Activsense automatic emergency braking system activating with no real obstacle (phantom braking) or grabbing when maneuvering around vehicles at low speed, with the system noticeably more sensitive than rivals even at its lowest setting. Owners also repo… Severity: medium.
What is the 2020-2021 Mazda CX-30 Power Liftgate Unexpectedly Lowers - Recall 21V086000 (4621B)?
On affected 2020-2021 CX-30s, the fully-opened power liftgate can partially lower on its own when the vehicle is parked facing uphill on a slope. Mazda traces it to insufficient frictional retaining force in certain power liftgate drive motor units combined with reduced support-s… Severity: medium.
What is the 2020-2021 Mazda CX-30 Rear Door Service Hole Cover Seal Failure - Water Leak into Rear Passenger Floor (TSB 09-020/21)?
2020-2021 CX-30 vehicles leak water into the passenger compartment from the rear doors, entering at the bottom of the service hole behind the rear door trim panel. Mazda identified two causes: the service hole cover's seal rubber lacks resistance to surfactants and deteriorates w… Repairs typically run $0-$450. Severity: medium.
What is the 2020-2024 Mazda CX-30 Climate Control Unit and Body Control Module Fail to Enter Sleep Mode - Parasitic 12V Battery Drain (SSPC5)?
Mazda issued Special Service Program SSPC5 for the CX-30 covering multiple control-module reprogramming concerns, the first of which is a battery concern: the climate control unit (CCU) and body control module (BCM) may not transition into sleep mode after the ignition is switche… Repairs typically run $0-$400. Severity: medium.
What is the 2020 Mazda CX-30 Front Strut Upper Mounting Rubber Clearance Defect - Rattle Over Bumps (TSB 02-004/21)?
Early-production 2020 CX-30 vehicles built before October 15, 2019 exhibit a rattle from the front suspension when driving over bumps or wavy road surfaces. Mazda traced it to the strut upper mounting rubber: insufficient clearance between the rubber and the metal bracket of the… Repairs typically run $0-$900. Severity: low.
What is the 2020-2021 Mazda CX-30 Bose Audio Amplifier Control Program Fault - Loud Static from Speakers (SSPC4)?
CX-30 vehicles equipped with the optional Bose audio system may emit a loud static or buzzing noise from some or all speakers, caused by an inappropriate control program in the audio amplifier. The noise occurs independently of what is playing and independently of driving status… Repairs typically run $0-$0. Severity: low.
