Powertrain, generic · Transmission

P089B Gear Lever X Position Sensor 2 Circuit Range/Performance

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 P089B when X sensor 2 reports a lever travel outside the gate (tolerance 5.5 % of duty cycle), its frequency is faulty, or it differs from sensor 1 by more than 12 %; 3 of 4 samples every 25 ms. Type B, MIL after two trips.

Likely causes

Sensor 2 in the selector assembly faulty or drifting
Selector mechanism worn or bent
Loose contact or interference on the PWM line
Liquid in the console

Symptoms

  • MIL after two trips
  • Range selection delayed or limited
  • Only P available if both sensors fail

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€250–900
Time1–2 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

P082AP089AP089CP089DP08A0P08A4

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