Pressure Control Solenoid 'C' Control Circuit High
The P2739 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the control circuit of the pressure control solenoid 'C'. This solenoid regulates hydraulic pressure within the automatic transmission to control shift timing and firmness. A high voltage reading typically points to a short to power, open circuit, or faulty solenoid, which can lead to erratic shifting, harsh engagement, or transmission slippage.
01. Most Common Causes
- Faulty pressure control solenoid 'C'
- Short to power in the solenoid control circuit
- Open or high resistance in wiring/connectors
- Corroded or damaged transmission harness
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission slipping or overheating
- Reduced fuel economy
- Transmission stuck in limp mode
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission wiring and connectors for damage, corrosion, or shorts.
Step 3: Test pressure control solenoid 'C' resistance and compare to specs (typically 4-6 ohms).
Step 4: Check for voltage at solenoid connector with key on; should be battery voltage with PCM commanding low.
Step 5: If wiring and solenoid are good, test PCM output or replace PCM.
04. Commonly Affected Makes
05. 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 overheat, potentially causing internal damage. Limp mode may limit speed.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on whether the solenoid, wiring, or PCM needs replacement. Labor is typically 1-2 hours.