P1399 BUICK, CADILLAC, CHEVROLET, GMC: INTERMITTENT WHEEL SPEED SENSOR CIRCUIT 2 - G - SENSOR
POST UPDATED IN January, 2023
P1399 BUICK, CADILLAC, CHEVROLET, GMC: INTERMITTENT WHEEL SPEED SENSOR CIRCUIT 2 - G - SENSOR
When the crankshaft speed experiences some changes from the ECM (Engine Control Module), these variations are monitored to check and identify various misfires. However, the crankshaft speed changes are not only caused by these failures, as uneven road conditions also cause them.
The ABS (Anti-lock Braking System) uses the data provided by the Wheel Speed Sensors based on the acceleration/deceleration function, which allows identifying uneven road conditions. Once this data is collected, it is sent to the ECM to determine if the speed variations are the result of an engine failure or road conditions.
Setting the fault code P1399 OBDII means that a fault has been detected in the Wheel Speed Sensor 2 or G – Sensor, in which its circuit experiences intermittent voltages.
The reasons for setting the diagnostic code P1399 OBD2 are
To solve the DTC code P1399 OBDII, you must do the following: