What it means
The current through pressure control solenoid E does not match the commanded value within tolerance.
At a glance
- Usually lights the check-engine light
How it works
Pressure control solenoid E regulates transmission fluid pressure in response to commands from the transmission control module. P2728 sets when the current in solenoid E's control circuit does not track the commanded level within the module's allowed range, which can reflect a heat-sensitive coil or poor electrical contact.
Common causes
Most likely first.
- Coil resistance changed by thermal stress
- High-resistance contact in solenoid connector
- Sensor element aged beyond calibration window
Symptoms
- Check-engine or transmission warning light on
- Harsh or delayed shifts
- Slipping or shuddering during shifts
- Transmission may enter limp mode
How to diagnose it
- Use a scan tool to record freeze-frame data and compare commanded solenoid E operation with available circuit or transmission pressure data.
- Inspect the transmission connector and solenoid E wiring for corrosion, loose pins, heat damage, or signs of a poor connection.
- Check solenoid E coil resistance when cold and, if the fault is intermittent, compare it after the transmission warms, using the manufacturer's specification.
- Check for excessive resistance or voltage drop across the solenoid E connector and control circuit while the circuit is operated as specified by the manufacturer.
- If the electrical circuit checks out, have the solenoid valve and its valve-body passage checked for sticking or wear that could affect pressure response.
Common fixes
- Clean or repair a high-resistance solenoid E connector terminal.
- Repair damaged wiring in solenoid E's control circuit.
- Replace solenoid E if its coil resistance is out of specification, especially when warm.
- Repair or replace a worn valve-body bore or sticking solenoid valve if hydraulic checks identify it.
Can I keep driving?
Keep trips short and gentle, and avoid towing or heavy acceleration because slipping or harsh shifts can worsen transmission wear. Stop driving if the transmission loses drive or begins slipping repeatedly.
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.