P27AFPressure Control Solenoid J Data Incompatible
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- No manufacturer documents P27AF publicly. By its wording it would mean that the TCM considers the stored calibration of a ninth pressure control solenoid, letter J, invalid. GM's published characterization monitor (P27A7 to P27AE, Type A, run at TCM start-up) stops at H, and Ford reports faulty solenoid data on its 10R and 8F transmissions with its own codes P163E and P163F instead of this series. CARB 13 CCR 1968.2 requires transmission output components to be monitored, so a maker with more valves could use J. If it appears, the logic of the GM siblings applies: data missing after a module or valve body change, wrong data set, or a damaged block. A drivable car with MIL and rough shifts is the likely result.
- What you may notice
- MIL illuminated
- Rough or inconsistent shifts involving the element behind valve J
- Likely causes
- LikelySolenoid data not loaded after TCM or valve body replacement
- PossibleData set for another valve body variant
- RareCorrupted calibration block in TCM memory
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.