P2729: Pressure Control Solenoid E Control Circuit Low

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.

Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.

Symptoms

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

Most likely causes

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

What to check, in order

Start with the simplest. You can tick off each step.

Check the fluid level and condition according to the manufacturer
With the connector unplugged, check whether the signal wire is making contact with ground.
Check the transmission connector
Read the data with a transmission-compatible scanner
Measure the solenoid valve circuit
Leave opening the transmission to a specialized repair shop

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2729 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
7: Transmission
29: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2729?

Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.

What causes code P2729?

The most common causes are: control wire shorted to ground; shorted winding in solenoid E; tCM internal failure (GM 8L90).

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.