P2729: Pressure Control Solenoid 'E' Control Circuit Low
The P2729 code indicates that the Powertrain Control Module (PCM) has detected a low voltage or resistance condition in the control circuit of the pressure control solenoid 'E'. This solenoid is part of the transmission's hydraulic system, regulating line pressure for proper shifting. A low circuit condition can be caused by a faulty solenoid, wiring issues, or a PCM problem, leading to erratic shifting or transmission slippage.
1. Most Common Causes
- Short to ground in the wiring of solenoid 'E' control circuit
- Excessive resistance or loose connection at solenoid connectors
- Faulty pressure control solenoid 'E' with internal coil short
- Internal failure of the transmission control module (TCM) or PCM
- Wiring harness damage due to chafing, heat, or corrosion
- Poor connection at transmission or PCM connector
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or delayed engagement
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test solenoid resistance with a multimeter (typically 4-6 ohms).
Step 4: Check for voltage and ground at the solenoid connector with the engine running.
Step 5: If wiring and solenoid are good, test PCM output or replace PCM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a low circuit condition can cause transmission damage due to improper line pressure. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary: solenoid replacement $150-$300, wiring repair $100-$200, PCM replacement $500-$1000. Typical total $150-$400.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.