Shift Solenoid Control Circuit High Voltage
The P0980 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the control circuit of the shift solenoid 'C' (or a specific solenoid depending on vehicle). This solenoid is part of the transmission's hydraulic control system, regulating fluid flow to engage gears. A high voltage reading suggests a short to power, open circuit, or faulty solenoid, which can cause erratic shifting, transmission slippage, or limp mode.
01. Most Common Causes
- Faulty shift solenoid
- Short to power in solenoid circuit wiring
- Open or high resistance in solenoid circuit
- Damaged PCM or transmission control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission stuck in gear or limp mode
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect wiring and connectors 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 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. Driving with a high voltage solenoid circuit can cause transmission damage or sudden failure. 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 $50-$150, plus diagnostic time.