Note On Intermittents

Intermittent setting of wheel speed sensor trouble codes may be caused by improper routing (sensor cables next to spark plug wires), cables not retained in mounting bracket, loose fitting or improperly mounted sensors, damaged sensors or toothed rings, poor terminal connectors and intermittent short or open in wiring.

Fig 1: Code 25 Schematic - LF Wheel Speed Sensor Fault

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 25 Flow Chart (1 of 2) - LF Wheel Speed Sensor Fault

Courtesy of GENERAL MOTORS CORP.

Fig 3: Code 25 Flow Chart (2 of 2) - LF Wheel Speed Sensor Fault

Courtesy of GENERAL MOTORS CORP.