Powertrain, generic (extended)

P2729 Pressure Control Solenoid E Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Control wire shorted to ground
Shorted winding in solenoid E
TCM internal failure (GM 8L90)
Conductive contamination in the connector

Symptoms

  • MIL on and fail-safe mode
  • Abrupt stop or wheel lock at low speed in the GM 8L90 case
  • Limited gear selection

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,500
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pressure control solenoid ewiring harness

Related codes

P2725P2727P2728P2730P2720

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, fordservicecontent.com.