C036

DTC C0235-C0237, C035-C037 or P1504





Test 1-3





Test 4-10

Circuit Description
The PCM or vehicle speed sensor buffer (diesel) converts the data from the vehicle speed sensor to a 128k pulses/mile signal. The EBCM uses the vehicle speed signal from the PCM or VSSB in order to calculate the rear wheel speed.

Conditions for Running the DTC
C0235
The ignition is ON.
C0236 and C0237
^ The ignition is ON.
^ The vehicle speed is greater than 32 km/h (20 mph) when the brake is applied or 19 km/h (12 mph) when the brake is released.
P1504
^ The ignition is ON.
^ The vehicle is not moving.

Conditions for Setting the DTC
C0235
The EBCM detects low voltage on the vehicle speed signal circuit for 500 milliseconds.
C0236
The rear wheel speed signal is less than 6 km/h (4 mph) for 5 seconds (120 seconds in order to set multiple missing sensor signal DTCs).
C0237
The EBCM detects an erratic rear wheel speed signal for 105 milliseconds.
P1504
The PCM detects low voltage on the vehicle speed signal circuit for 45 seconds.

Action Taken When the DTC Sets
^ The EBCM disables the ABS.
^ The ABS indicator turns ON.

Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for a voltage signal from the PCM or the VSSB (diesel).
4. This step tests for a missing or erratic vehicle speed signal from the PCM or VSSB. An assistant may be required in order to perform this test.