Upshift/Skip Shift Solenoid Control Circuit Range/Performance
The P080B code indicates that the Powertrain Control Module (PCM) has detected a performance or range issue in the upshift/skip shift solenoid control circuit. This solenoid is used in some manual transmission vehicles to force the driver to shift from 1st to 4th gear under certain conditions (light throttle, low speed) to improve fuel economy. The PCM monitors the solenoid's electrical circuit and operation; if the resistance or voltage is out of expected range, or the solenoid fails to actuate properly, this code sets.
01. 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)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in 1st gear or unable to shift to 4th when expected
- Harsh or erratic shifting
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the solenoid and wiring for damage or corrosion.
Step 3: Test solenoid resistance with a multimeter (specs vary, typically 20-40 ohms).
Step 4: Check for voltage and ground at the solenoid connector with the ignition 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 generally safe for short distances, but the transmission may not shift properly, potentially causing drivability issues or reduced fuel economy. Have it diagnosed soon.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and solenoid replacement if needed. PCM replacement is more expensive.