P08A1Gear Lever Y Position Sensor 2 Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The selector lever's Y-axis sensor 2 is one of two redundant Hall sensors that send the lever travel as a PWM duty cycle. GM documents P08A1 for its electronic range selection: the code sets when the measured duty cycle of Y sensor 2 drops below 17 % (2019 ECM and ICCM tables) or below 5 % (Cadillac XT4 2019, ECM tables 2023–2025), checked 3 of 4 samples at 25 ms or 10 of 12 in later years. Typical reasons are a signal wire shorted to ground, a missing sensor supply or a dead sensor output. Type B, MIL after two trips. Unlike P08A0 this is a pure signal limit, not a plausibility check; high is P08A2. Sensor 1 keeps the selector working.
- What you may notice
- Check engine light after two drives
- Shifter warning message in the cluster
- Normally no change in driving, sensor 1 takes over
- Likely causes
- LikelySensor 2 signal wire shorted to ground
- PossibleSensor supply open or connector backed out
- PossibleSensor 2 in the selector assembly without output
- RareConnector corrosion from liquid in the console
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.