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.
01. Most Common Causes
- Faulty upshift/skip shift solenoid
- Short to power in the solenoid control circuit
- Open circuit in the solenoid control circuit
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission may not skip shift (stays in 1st, 2nd, 3rd, etc.)
- Harsh or erratic shifting
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the solenoid and its wiring for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter (compare to specs).
Step 4: Check for voltage at the solenoid connector with key on; if voltage is present when not commanded, there is a short to power.
Step 5: If wiring and solenoid are good, test the PCM output or replace the PCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the skip shift feature may not work, and fuel economy may decrease. Have it diagnosed soon to avoid potential transmission issues.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, including parts and labor. Replacing the solenoid is usually under $100, while PCM replacement can be more expensive.