Powertrain, generic · Transmission

P089C Gear Lever X Position Sensor 2 Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

Gear lever position sensor 2 is the redundant second sensor of an electronic selector lever, next to sensor 1 (P0821 ff), for the X or Y axis. The only documented user is GM's electronic range selection with PWM Hall sensors, as in the Cadillac XT4, and only for range, low and high. Following GM's patent, an invalid sensor is dropped and the other carries on; with both invalid the module can request park. GM sets P089C when the duty cycle of X sensor 2 falls below 17 % (2019) or 5 % (XT4 and 2025): signal wire to ground, sensor without output or missing supply. Type B, MIL after two trips; sensor 1 carries on.

Likely causes

Sensor 2 signal wire shorted to ground
Sensor 2 faulty
Supply of the selector sensor open
Connector corrosion from spilled drinks

Symptoms

  • MIL after two trips
  • Gearbox or selector warning in the cluster
  • Usually still drivable, sensor 1 takes over

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€200–900
Time0.8–2 h

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

Parts involved

gear lever position sensorelectronic shift modulesensor wiringengine control module

Related codes

P082BP089AP089BP089DP08A1

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