DTC 35 - Left Rear Wheel Speed Sensor Fault: Notes

Toothed wheel generates a voltage pulse as it moves past sensor. EBTCM uses these pulses to determine wheel speed. EBTCM uses wheel speed sensor signal to calculate vehicle reference speeds and speed, acceleration and slip values for each wheel. These values are used to determine when anti-lock or traction control is needed.

EBTCM will only set one wheel speed sensor DTC at a time, even if multiple faults exist. Detection is prioritized accordingly: LF, RR, LR and RF. Check for additional stored DTCs after making repairs.

DTC 35 will set if the left rear speed signal is not detected by the time vehicle reaches 7.5 MPH on initial drive off or the signal is lost while driving at speeds greater than 25 MPH.

DTC 35 will set if there is a short to ground or battery voltage in circuits No. 884 or 885, or a faulty wheel speed sensor. Testing for this fault occurs when the vehicle is in motion, it will not set with ignition on and vehicle at rest.

DTC 35 may set if circuits No. 884 or 885 lose continuity and wheel speed sensor signal is lost while driving. DTC 37 should accompany this DTC on next ignition cycle. If DTCs 35 and 37 are set concurrently, diagnose DTC 37 first.

1. Checks if DTC resets during a road test.
2. Use Tech 1 to check for sources of induced electrical noise.
3. Checks for damaged wheel speed sensor circuit shield.
4. Checks for intermittent opens/shorts in wheel speed sensor circuits and cables.
   Fig 3: DTC 35 Diagnostic Flow Chart - 2 Of 2

   Courtesy of GENERAL MOTORS CORP.
5. Checks for correct resistance in sensor.
6. Checks for a short to battery voltage in either speed sensor circuit wires.
7. Checks for a short between speed sensor circuit wires.
8. & 9) Checks for short to ground in speed sensor input circuit wire. A short with a resistance less than 2 megohms, though not a hard short, can still cause DTC 35 to set.