C0042

The front wheel speed sensors monitor speed of each wheel by placing a magnetic coupling next to a toothed ring mounted on the axle of each wheel. The signal frequency changes with the wheel speed. This sensor produces a AC signal that the EBTCM uses to calculate wheel speed.

CODE PARAMETERS
DTC C0042 will set if:
- Right front wheel 0 kph (0 mph) and the other three wheel speeds are greater than 8 kph (5 mph) for 2.5 seconds.
- No wheel speed codes C0035, 40, 45, or 50 are set.
When the trouble code sets, ABS is disabled and the antilock telltale is turned on.
Dynamic rear proportioning (DRP) will have minor degradation unless a LF wheel speed code is also set, then DRP is disabled and the RED brake telltale is turned on.

DIAGNOSTIC AIDS
Before proceeding with the trouble tree, make a thorough visual inspection of the wheel speed sensor circuitry. Closely inspect the inline connector(s) since this is the most likely area for opens and shorts.
When attempting to diagnose an intermittent problem, use the Scan tool to review supplemental diagnostic information. The Supplemental data can be used to duplicate a problem.
Intermittents, shorts or opens suspected to be at the connectors can be detected by using a diagnostic service probe. Voltage can be read on wires without disconnecting any connectors.
Check the tightness of the female grip with a spare male terminal.
Possible causes for DTC C0042 to set:
- Wheel speed sensor has low or not output.
- Excessive air gap.
- No speed ring.
- Wheel speed sensor shorted.