Powertrain, generic · Transmission

P08A5 Gear Lever Y Position Sensor 1/2 Correlation

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P08A5 is the Y-axis twin of P08A4: the two redundant sensors that measure the selector lever's Y travel disagree beyond a calibrated limit. No manufacturer documents P08A5 publicly. In GM's electronic range selection the same check exists but is reported as range/performance: P08A0 sets when Y sensor 2 and Y sensor 1 differ by more than 12 % duty cycle, Type B. GM's patents show why redundancy matters: a disagreeing pair is resolved by trusting the more fault-tolerant signal, and if that is not possible the module selects neutral or park. CARB 1968.2 (e)(15) requires such rationality checks for inputs. For the driver this means a refused or held range; repairs usually replace the selector assembly.

Likely causes

One of the two Y sensors drifting
Magnet carrier or lever mechanism shifted or worn
Contact resistance on one sensor's signal path

Symptoms

  • Shifter warning message
  • Range selection refused or vehicle held in neutral or park
  • Check engine light, depending on the manufacturer

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–1,000
Time0.5–2.5 h

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

Parts involved

gear lever y position sensor 1gear lever y position sensor 2tcm

Related codes

P08A4P08A6P08A0P082DP0822

References: law.cornell.edu, patents.google.com, patents.google.com, gsi.ext.gm.com.