What does code P1397 mean?

Q: What does code P1397 mean?

Wheel Speed Sensor 2 G-Sensor Circuit Low Voltage. P1397 on a GM vehicle means the body control module or ABS control module has detected a low-voltage condition on the signal circuit for wheel speed sensor 2, which is often paired with a G-sensor (acceleration sensor) input on the same harness. The computer expects a fluctuating voltage from that sensor as the wheel rotates, but the signal stays below the acceptable threshold, so it flags the circuit as faulty and may disable traction control or anti-lock braking.

DTC codes / GM codes / P1397

P1397 · GMWheel Speed Sensor 2 G-Sensor Circuit Low Voltage

P1397 on a GM vehicle means the body control module or ABS control module has detected a low-voltage condition on the signal circuit for wheel speed sensor 2, which is often paired with a G-sensor (acceleration sensor) input on the same harness. The computer expects a fluctuating voltage from that sensor as the wheel rotates, but the signal stays below the acceptable threshold, so it flags the circuit as faulty and may disable traction control or anti-lock braking.

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.