P0747: How to Diagnose & Fix — Pressure Control Solenoid Stuck On
4 vehicles · 3 makes · $300-$6,500 repair
How to diagnose and fix P0747: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Cadillac CT5 · 2020–2021
Owners of 2020-2021 Cadillac CT5 and CT5-V models equipped with the GM Hydra-Matic 10L80 10-speed automatic report harsh, abrupt shifts accompanied by an illuminated check engine light. GM Preliminary Information bulletin PIP5799 documents an electrical fault in Transmission Control Solenoid Valve 7 (the line pressure solenoid) that stores DTC P2812 or P2814 in the TCM. Separately, NHTSA Safety Recall N242480630 (NHTSA 25V148) covers TCM monitoring software for a related transmission control valve wear condition that, in rare cases, can cause momentary wheel lock-up. A related Special Coverage bulletin (N242480631) extends warranty for the P0747 control-valve condition to 15 years / 150,000 miles. Note: the 2020-2021 CT5 does not include the CT5-V Blackwing (introduced for MY2022 with the 10L90), which is NOT part of this recall population.
Common Symptoms
- Harsh or abrupt shifts
- Check engine / SES light
- Reduced engine performance / Reduced Propulsion message
- Possible momentary wheel lock-up (subject of recall N242480630)
How to Fix
Scan the TCM; if P2812 or P2814 is set, follow SI diagnostics for the line pressure solenoid circuit. PIP5799 directs that, if no other root cause is found, the valve body is replaced. Also verify GM Safety Recall N242480630 (TCM monitoring software for wheel lock-up risk) has been performed; owner letters were mailed April 7, 2025. If P0747 sets after the TCM update, the control valve body replacement is covered under Special Coverage N242480631 for 15 years / 150,000 miles.
Sources for this issue (1)
GMC Sierra 1500 · 2024–2025
2024-2025 Sierra 1500 trucks with the 10-speed automatic (5.3L L84, 6.2L L87 and 3.0L Duramax LZ0) are failing at very low mileage with a stuck valve-body solenoid. Symptoms: a 'Service Transmission' or 'Service Transmission — Unable to Shift Soon' message, sudden hard/slamming shifts, slipping, complete loss of reverse (owners have had to push the truck out of parking spaces), and default limp operation limited to fifth gear and reverse. Several complaints report the failure occurring under 7,000 miles. NHTSA reports cite DTC P2818 (pressure control solenoid) and P0747/P0700. The situation is compounded by a national valve-body backorder — owners document 50-plus days and in some cases over a year waiting for the part, with GM sometimes authorizing a full transmission replacement instead. Complaint ODI numbers include 11756150, 11754176, 11748050, 11744152, 11739083, 11727368, 11721983, 11694617, 11684139, 11680422, 11680435, 11654431, 11644523, 11634982 (2024) and 11711937 (2025).
How to Fix
GM issued TSB #25-NA-255 (Sept 22, 2025) directing technicians to REPAIR rather than replace the valve body on 2021-2024 Silverado/Sierra 1500 and full-size SUVs with the 10L80/10L90 when P0747 is set. The repair installs a new steel Feed Limit Low Valve, a higher-tension Feed Limit Valve Spring, and a new valve body spacer plate with gasket; it requires at least 7,000 miles on the vehicle and must not be used if there is significant clutch debris in the pan. No solenoid characterization programming is needed afterward. Ask the dealer specifically for the 25-NA-255 repair kit rather than accepting a backordered complete valve body. Repairs are covered under the 5yr/60k powertrain warranty for these model years. If clutch material is present, a transmission replacement is the correct call.
Sources for this issue (2)
GMC Sierra 3500HD · 2008–2019
The Allison 1000 transmission paired with the Duramax diesel in 2008-2015 Sierra 3500HD trucks has a high failure rate for the Transmission Control Module (TCM). A class action suit was filed covering these years. Additional issues include input/output speed sensor failures causing no-forward/reverse conditions, and certain 2012 trucks built with incorrect thrust bearings.
Common Symptoms
- Intermittent no forward or reverse movement
- Flashing PRNDL display
- Range Shift Inhibited message
- Harsh or delayed shifts
- Transmission noise or whine
- Check engine light with transmission codes
How to Fix
Sources for this issue (1)
Chevrolet Silverado 1500 · 2007–2019
Chevrolet Silverado 1500 · 2024–2025
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P0747 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0747 mean?
P0747 stands for "Pressure Control Solenoid Stuck On." This transmission code means the pressure control solenoid 'A' is stuck in the on (or fully applied) position, or its circuit behaves as if permanently energized. This solenoid regulates hydraulic line pressure that controls clutches and shift feel inside the automatic transmission. When it stays on, line pressure can't be modulated properly, leading to harsh shifts, slipping, overheating, or the transmission being stuck in a gear or limp mode. It points to the solenoid, its wiring, or a hydraulic/contamination problem in the valve body.
What are the most common causes of P0747?
The most common causes of P0747 are: Stuck or failed pressure control solenoid, Dirty or contaminated transmission fluid blocking the valve, Debris stuck in the valve body bore, Shorted or chafed solenoid wiring, Corroded or loose solenoid connector, Low or degraded transmission fluid, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0747?
Repair costs for P0747 range from $300 to $6,500, depending on the vehicle and root cause.
Which vehicles are affected by P0747?
Au7o has documented P0747 across 4 vehicle models from 3 manufacturers: Cadillac, Chevrolet, GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.