Pressure Control Solenoid 'C' Control Circuit High
The P2739 code indicates that the transmission control module (TCM) has detected a high voltage condition in the control circuit of the pressure control solenoid 'C'. This solenoid regulates hydraulic pressure for clutch or band application within the automatic transmission. A high circuit voltage typically points to a short to power, open circuit, or faulty solenoid, which can lead to erratic shifting, harsh engagement, or transmission slippage.
1. Most Common Causes
- Faulty pressure control solenoid 'C'
- Short to power in the solenoid control circuit
- Open or high resistance in wiring or connectors
- Corroded or damaged connector pins
- Failed TCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission slipping or stuck in gear
- Reduced fuel economy
- Transmission overheating
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: Measure resistance of solenoid 'C' (typically 5-20 ohms) and compare to specs.
Step 4: Check for voltage at solenoid connector with key on; should be battery voltage or pulsed signal.
Step 5: Perform a solenoid actuation test using a scan tool to verify operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may shift erratically or fail, causing unsafe driving conditions. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Solenoid replacement is often $50-$150 for the part plus diagnostic time.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.