P0972Shift Solenoid A Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Range/performance fault in the drive circuit of shift solenoid A: the circuit is not plainly shorted, yet its electrical behaviour does not fit what the module commands. Today's large makers rarely use the code. GM's 2007 table for the Allison 1000 six-speed used it for an open SS1 circuit: after three hardware fault samples the module opens the low-side driver as an intrusive test and reports P0972 if four more samples show no short to ground (400 ms, Type A, MIL at once). Newer GM Allison tables move that open to P097A. Ferrari's DCT bulletin reuses P0972 for a missing signal from the actuator 1 engage position sensor, not a solenoid. Ford and GM six-speeds report opens elsewhere. Shorts are P0973/P0974.
- What you may notice
- MIL or transmission warning on
- Transmission falls back to a fixed default gear
- Missing or abrupt shifts
- Likely causes
- LikelyOpen or high-resistance coil of shift solenoid A (Allison-type usage)
- PossibleLoose or corroded terminal at the transmission connector or internal harness
- PossibleChafed or broken wire between module and solenoid
- RareFaulty driver stage in the transmission 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: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.