P0747 on Cadillac: How to Diagnose & Fix
Pressure Control Solenoid Stuck On
1 Cadillac model · 1 documented issue · 1 critical
P0747 on Cadillac by model: symptoms, diagnosis and fix
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 1 model: 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.