Upshift/Skip Shift Solenoid Control Circuit Range/Performance
The P080B code indicates that the Powertrain Control Module (PCM) has detected a malfunction in the upshift/skip shift solenoid control circuit. This solenoid is used on some manual transmission vehicles to force the driver to shift from 1st to 4th gear under certain conditions to improve fuel economy. The code sets when the circuit voltage or resistance is out of the expected range, or the solenoid performance is not as commanded.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in 1st gear or unable to shift to 4th gear
- Harsh or erratic shifting
- Reduced fuel economy
2. Most Common Causes
- Faulty upshift/skip shift solenoid
- Open or shorted wiring in the solenoid control circuit
- Poor electrical connection at the solenoid or PCM
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the wiring and connectors for the upshift solenoid for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specifications (typically 20-30 ohms).
Step 4: Check for voltage at the solenoid connector with the ignition on; should be battery voltage.
Step 5: If wiring and solenoid are okay, test the PCM output by commanding the solenoid on/off with a scan tool.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive with this code as it can cause the transmission to operate improperly, potentially leading to unsafe driving conditions or further damage.
How much does it cost to fix?▼
The cost to fix P080B typically ranges from $50 to $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.