P0747 on Cadillac: How to Diagnose & Fix
Pressure Control Solenoid Stuck On
3 Cadillac models · 3 documented issues · 2 critical
P0747 on Cadillac by model: symptoms, diagnosis and fix
GM bulletin 20-NA-136 (May 2024) gives a diagnostic and repair strategy for 9T65 nine-speed automatics (RPO M3W/M3V) in 2021-2024 XT5 and related GM crossovers that set transmission DTCs with less than 12,000 miles on the odometer. It points technicians to PIP5974 for a clutch snap-ring pop-out that can set P0746/P0747. Depending on which solenoid-related codes reproduce on a road test and on fluid condition, the bulletin calls for replacing the solenoid body and/or control valve body, and for removing the transmission to inspect the clutches when the fluid is dark and burnt. The earlier replacement pilot program has ended.
Common Symptoms
- Check engine light with transmission DTCs (such as P0746/P0747) at low mileage
- Harsh, soft or delayed shifts or slipping
How to Fix
Have a qualified technician confirm the transmission RPO and current GM guidance before choosing a repair. Bulletin 20-NA-136 calls for recording all DTCs, checking fluid level/condition and line pressure, and a road test; its replacement pilot has ended, so it does not mandate a replacement transmission. P0747 can also occur at shutdown without an internal mechanical fault. Repair scope and warranty eligibility must be established for the diagnosed condition. Ask Cadillac to check the VIN for the separate 23V172 sun-gear recall.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
Historical service update N242446290 identified certain 2024 XT6 inventory vehicles with out-of-specification internal transmission retaining rings. Dealers had to repair eligible inventory before delivery; the update expired July 31, 2025. This does not prove a sold vehicle missed the repair or exclude later diagnosis. Separately, PIP5974A describes possible snap-ring trouble on 2024 XT6 transmissions M3G/M3W built October 1, 2023–April 22, 2024, with P0746/P0747 and possible slipping or no drive.
Common Symptoms
- P0746 or P0747 with service-engine indication in the applicable diagnostic branch
- Slipping in Drive
- No drive
How to Fix
Ask Cadillac to check VIN campaign/completion history and applicable warranty coverage. The inventory update specifies clutch piston housing replacement. For a symptomatic vehicle, PIP5974A calls for internal inspection when its build-date and recurring-code/slipping criteria are met; the qualified technician then follows current service information and VIN-specific parts selection. It explicitly excludes valve-body/solenoid-body replacement for this particular concern. Do not drive a vehicle with loss of drive; arrange assistance.
Sources for this issue (2)
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)
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 on a Cadillac?
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. On Cadillac it is documented across 3 models: XT5, XT6, CT5.
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 on a Cadillac?
Repair costs vary widely with the root cause and Cadillac model; each issue on this page carries its own estimate where one is published.
Looking for P0747 on a different make?
View P0747 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.