P08A0Gear Lever Y Position Sensor 2 Circuit Range/Performance
- 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
- Sensor 2 is the redundant second Hall sensor that reports the Y-axis travel of an electronic selector lever as a PWM duty cycle. GM uses it in its electronic range selection (ECM and ICCM tables 2019–2025, Cadillac XT4 among them). P08A0 is set when sensor 2 reports a lever path outside the shifter gate (tolerance 5.5 %, ICCM 6–11 % of duty cycle), its frequency check fails, or it disagrees with Y sensor 1 by more than 12 %. Debounce is 3 of 4 samples at 25 ms (2025: 10 of 12). Type B, MIL after two trips. Low/High of the same sensor are P08A1/P08A2. GM's patent lets the other sensor carry on; only when both are invalid may the module ask for park.
- What you may notice
- Check engine light after two drives
- Shift lever message or occasional unaccepted range selection
- Usually still drivable, sensor 1 takes over
- Likely causes
- LikelySensor 2 in the selector assembly drifting or faulty
- PossibleSelector mechanism worn, bent or binding, lever leaves its nominal path
- PossibleLoose contact or interference on the PWM signal line
- RareSpilled liquid in the centre console
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.