Pressure Control Solenoid 'C' Control Circuit High
The P2815 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 to the transmission clutches and bands. A high circuit voltage typically points to a short to power, open circuit, or a faulty solenoid. This can cause erratic shifting, slipping, or harsh engagement.
01. Most Common Causes
- Faulty pressure control solenoid 'C'
- Short to power in the solenoid control circuit
- Open or high resistance in the wiring or connector
- Corroded or damaged connector pins
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- 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 wiring and connector for damage, corrosion, or shorts.
Step 3: Test solenoid resistance with a multimeter (compare to specs).
Step 4: Check for power and ground at solenoid connector with key on.
Step 5: If wiring and solenoid are OK, 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 slip, potentially causing internal damage. Limp mode may limit speed.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Solenoid replacement is often $100-$200, plus diagnostic time.