P2729Pressure Control Solenoid E Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2729 indicates the control line of solenoid E is pulled low, usually by a short to ground. On the Allison 1000 GM detects this when the output connection has almost no impedance to ground and confirms it within 75 ms (Type A). The eight-speed and six-speed tables of 2016 flag the low state for 0.3 s and set it after one trip. For the 2023 Corvette dual-clutch transmission, a sense voltage below roughly 1.7 V with the driver on, held for 150 ms, identifies a ground short at the system pressure pilot valve (Type A); Ford's TR9070 stores its shorted switch case under this number. GM bulletin PIP5646B for 2019-2020 Silverado and Sierra 8L90 shows that P2729 can also come from a failing TCM rather than the harness.
- What you may notice
- MIL on and fail-safe mode
- Abrupt stop or wheel lock at low speed in the GM 8L90 case
- Limited gear selection
- Likely causes
- LikelyControl wire shorted to ground
- PossibleShorted winding in solenoid E
- PossibleTCM internal failure (GM 8L90)
- RareConductive contamination in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.