P0746 on Cadillac: How to Diagnose & Fix
Pressure Control Solenoid Performance/Stuck Off
2 Cadillac models · 2 documented issues · 1 critical
P0746 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)
P0746 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 P0746 mean on a Cadillac?
P0746 stands for "Pressure Control Solenoid Performance/Stuck Off." P0746 means the transmission's pressure control solenoid 'A' is performing poorly or appears stuck in the off (low pressure) position. This solenoid regulates hydraulic line pressure that applies clutches and bands to make smooth, firm shifts; the TCM detects when commanded pressure changes aren't producing the expected response. A stuck-off condition typically means line pressure stays low. You may experience slipping, soft or delayed shifts, harsh engagement, overheating, or the transmission entering limp mode. On Cadillac it is documented across 2 models: XT5, XT6.
What are the most common causes of P0746?
The most common causes of P0746 are: Low, dirty, or degraded transmission fluid, Faulty pressure control / EPC solenoid, Clogged valve body passages or stuck valve, Wiring or connector fault at the solenoid, Internal transmission wear (worn clutches, leaking seals), Dirty or clogged transmission filter, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0746 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 P0746 on a different make?
View P0746 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.