P08A0 code meaning
Gear Lever Y Position Sensor 2 Circuit Range/Performance
Powertrain system Generic code P08xx codes Check engine light
What P08A0 means
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.
P08A0 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P08A0
- Check engine light after two drives
- Shift lever message or occasional unaccepted range selection
- Usually still drivable, sensor 1 takes over
Common causes of P08A0
- Most 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
- Less likelySpilled liquid in the centre console
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Gear lever y position sensor 2Wiring harnessTCM
What each part of P08A0 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| A0 | The exact fault in that area. |
What to do next
- Note P08A0 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P08A0
What does P08A0 mean?
P08A0 means "Gear Lever Y Position Sensor 2 Circuit Range/Performance". Sensor 2 is the redundant second Hall sensor that reports the Y-axis travel of an electronic selector lever as a PWM duty cycle. It is a generic code, so it means the same on every make.
Is it safe to drive with P08A0?
Drive gently and only to a workshop. With P08A0 the car can go into limp mode (reduced power) to protect itself.
Will P08A0 fail an emissions test?
P08A0 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P08A0 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P08A0 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.