Powertrain, generic · Transmission

P08A2 Gear Lever Y Position Sensor 2 Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

Y sensor 2 is the backup Hall sensor of an electronic selector lever and reports the lever's Y-axis travel as a PWM duty cycle. GM uses P08A2 in its electronic range selection and sets it when the duty cycle of Y sensor 2 rises above 88 % (2019 ECM and ICCM tables) or above 95 % (Cadillac XT4 2019, ECM tables 2023–2025); 3 failures in 4 samples at 25 ms, in later calibrations 10 of 12. A signal line shorted to voltage, an open ground or an internal sensor fault are the usual reasons. Type B, MIL after two trips. Range/performance and low are P08A0 and P08A1; sensor 1 of the same axis reports via P082D to P082F. With one sensor still valid, the lever stays usable.

Likely causes

Sensor 2 signal wire shorted to supply voltage
Sensor ground open or high resistance
Internal fault of sensor 2 in the selector assembly

Symptoms

  • Check engine light after two drives
  • Shifter warning message in the cluster
  • Range selection normally still works via sensor 1

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

gear lever y position sensor 2wiring harnesstcm

Related codes

P08A0P08A1P08A3P082FP089D

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, patents.google.com.