P089A Gear Lever X Position Sensor 2 Circuit

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. P089A, the general circuit fault of X sensor 2, is used by no maker found; GM reports circuit faults through duty-cycle low or high and frequency errors under P089B.

Likely causes

Symptoms

• Gearbox or selector warning in the cluster
• Range selection delayed or limited
• Usually still drivable, sensor 1 takes over

Repair estimate

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

Parts involved

Related codes

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