P0971Pressure Control Solenoid C Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Pressure control solenoid C circuit high: a short to voltage, and on GM six-speeds also an open, as there is no separate open code there. The Saab 9-4X 6T70 (clutch pressure solenoid 3, low/reverse and 4-5-6 clutches) and GM's 2018 six-speed table set it after 1 s or 0.3 s as Type A, with limp mode in reverse and 5th gear at maximum line pressure. GM's 8-, 9- and 10-speeds use the code for their clutch solenoid C; GM's dual-clutch gearbox for the redundant odd-clutch shutdown valve, where too high a voltage at the sense pin with the output switched on counts as a short. Ford does not use C codes. Siblings: P0968 open, P0970 low, P0969 performance. A loose connector can make the fault come and go.
- What you may notice
- MIL on, limp mode in a fixed gear
- Harsh engagements at maximum line pressure
- Fault comes and goes with temperature or vibration
- Likely causes
- LikelyOpen coil or poor connection (reported as high on GM six-speeds)
- PossibleControl wire shorted to a supply voltage
- PossibleDamaged or loose transmission connector
- RareFaulty output stage in the control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.