Upshift/Skip Shift Solenoid Control Circuit High
The P080D code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the control circuit of the upshift/skip shift solenoid. This solenoid is used in some manual transmission vehicles to force a 1-4 skip shift under light throttle to improve fuel economy. A high voltage reading typically means there is a short to power, an open circuit, or a faulty solenoid or PCM.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Skip shift feature not working (stuck in 1st or forced 1-4 shift)
- Transmission shifting issues
- Reduced fuel economy
2. Most Common Causes
- Faulty upshift/skip shift solenoid
- Short to power in the solenoid control circuit
- Open circuit in the solenoid control circuit
- Corroded or damaged wiring/connectors
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the solenoid wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter (specs vary, typically 20-40 ohms).
Step 4: Check for voltage at the solenoid connector with key on; should be battery voltage on one pin and ground on the other.
Step 5: If wiring and solenoid are good, test the PCM output by backprobing the PCM connector.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but the skip shift feature may not work properly, and the Check Engine Light will be on. It's best to diagnose and repair soon to avoid potential transmission issues.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on whether the solenoid or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.