P27AAPressure Control Solenoid D 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
- P27AA is set when the TCM finds the calibration block for pressure control solenoid D unusable. Which hardware that is depends on the gearbox: GM's 2016 eight-speed assigns D to clutch 4 (C23468), while the 2017-2020 tables put the nine-speed's C2 clutch (CB29), the ten-speed's C5 clutch and the CVT's C1 clutch behind the same letter, so the D used by stuck-off code P2714 is not always the same part. GM checks it once at start-up, Type A. Ford handles the same task differently: its 10R60/10R80 summary reports a bad or empty TRID block holding solenoid data under its own codes P163E and P163F. Reprogramming the data that belong to the fitted valve body clears the fault.
- What you may notice
- MIL and stored DTC at key-on
- Rough shifts into gears using the clutch behind valve D
- Likely causes
- LikelySolenoid data not loaded after a transmission or TCM repair
- PossibleUsed TCM from another vehicle still carrying its old valve body data
- PossibleWrong valve body part number used for the download
- 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.