What does code P1390 mean?

Q: What does code P1390 mean?

Wheel Speed Sensor 1 G-Sensor Circuit. P1390 on GM vehicles indicates that the powertrain control module has detected an implausible signal from the wheel speed sensor circuit that also incorporates a G-sensor (gravity or accelerometer sensor) input, typically used for enhanced stability and traction control functions. The computer compares the expected wheel speed signal against the G-sensor reading and sets the code when the two do not correlate within an acceptable range during a defined driving maneuver.

DTC codes / GM codes / P1390

P1390 · GMWheel Speed Sensor 1 G-Sensor Circuit

P1390 on GM vehicles indicates that the powertrain control module has detected an implausible signal from the wheel speed sensor circuit that also incorporates a G-sensor (gravity or accelerometer sensor) input, typically used for enhanced stability and traction control functions. The computer compares the expected wheel speed signal against the G-sensor reading and sets the code when the two do not correlate within an acceptable range during a defined driving maneuver.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.