What it means
Voltage on the pressure control solenoid E control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
Pressure control solenoid E is an electrically operated valve used to regulate transmission fluid pressure. The transmission control module sets P2729 when voltage on solenoid E's control circuit falls below the expected range, which can happen if the wire is grounded or the coil is internally shorted.
Common causes
Most likely first.
- Control wire shorted to ground
- Internal short in solenoid coil
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine or transmission warning light on
- Harsh or delayed shifts
- Slipping or reduced drive
- Transmission may enter limp mode
How to diagnose it
- Record freeze-frame data and inspect other transmission codes to identify when the solenoid E circuit voltage dropped.
- Inspect solenoid E's connector and harness for chafing, water intrusion, pushed-back pins, and corrosion, paying attention to places the loom moves or contacts the transmission.
- With the circuit monitored on a scan tool, gently move the accessible solenoid E harness sections to see whether the fault changes.
- Test the control wire for a short to ground and check the solenoid E coil for an internal short, following the manufacturer's procedure.
- If the wiring and coil pass, check connector terminal fit and circuit voltage drop to locate a high-resistance connection.
Common fixes
- Repair chafed solenoid E wiring that is shorted to ground.
- Clean or replace corroded connector terminals and restore the connector seal.
- Repair a pushed-back or loose terminal in the solenoid E connector.
- Replace solenoid E if its coil is internally shorted.
Can I keep driving?
Drive only gently and for a short distance if shifts remain predictable; avoid towing, hard acceleration, and repeated slipping. Stop if the transmission loses drive or enters limp mode, since continued slipping can cause further damage.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.