C101C Right Front Wheel Speed sensor signal erratic performance

C101C Right Front Wheel Speed sensor signal erratic performance - When the Right Front Wheel Speed Sonsor (WSS) signal is intermittently missing while vehicle speed is above 40 km/h (25 mph) or erratic wheel speed signal during accelaration or sensed wheel speed is different from other wheels.

C101C-Right Front Wheel Speed sensor signal erratic performance.


Possible causes C101C code

  • Right front WSS loose circuits/connector/terminal damage.
  • Right front tone wheel damage.
  • Right front wheel/bearing damage.
  • Improper right front tire pressure/mismatched tire right front WSS.
  • Antilock Brake System (ABS) Module.

Diagnose C101C-Right Front Wheel Speed sensor signal erratic performance

Step 1. Check for DTC C101C-Right front wheel speed sensor signal erratic performance
This DTC must be active for the results of this test to be valid. If DTC C1015-Right Front Wheel speed sensor circuit is present it must be repaired before continuing.
Turn the ignition on, with the scan tool, record and erase DTC.

Caution : Make sure braking capability is available before road testing.

Road test the vehicle over 40 km/h (25 mph). Vehicle must be driven above 40 km/h (25 mph) for set conditions be met.
With the scan tool, read DTC.

Does the scan tool display C101C-Right Front wheel speed sensor signal erratic performance active ?

Yes, go to step 3.
No, go to step 2.

Step 2. Check wheel speed sensor signals
Turn the ignition on, with the scan tool, monitor and graph all the WSS speeds and compare graph while an assistant drives the vehicle.
If graph shows periodic dropouts pay close attention to the tone wheel.
Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).

Is the Right Front WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior ?

Yes, go to step 3.
No, perform ABS Verification Test.

Step 3. Check for improper right front tire pressure/mismatched tires
Turn the ignition off, check and adjust the right front tire pressure. Check and adjust all other tire pressures, inspect for mismatched tires on vehicle.

Is the Right Front Tire improperly inflated or mismatched tires on vehicle ?

Yes, repair as neccesary.
No, go to step 4.

4. Check Right Front WSS looseness, inspect circuits/terminal for damage
Check all terminals for broken, bent, pushed out, or corroded terminals.
Inspect the Antilock Brake Module harness connector, Right Front WSS, and Right Front WSS harness connector. Inspect the Right Front WSS for looseness, excessive corrosion and not properly fastened. Inspect the Right Front WSS signal and Right Front WSS supply circuits between the Right Front WSS and Antilock Brake Module for damage.

Is the Right Front WSS loose or any of the wiring/connector/terminals damaged ?

Yes, repair as neccesary.
No, go to step 5.

Step 5. Check Right Front wheel speed sensor for damage
Remove the Right Front wheel speed sensor, inspect the Right Front wheel speed sensor face for damage.

Is the Right Front wheel speed sensor damaged ?

Yes, replace sensor and hub assembly.
No, go to step 6.

Step 6. Check Right Front tone wheel/bearing for damage
Inspect the Right Front tone wheel/bearing for damage, missing teeth, cracks, corrosion or looseness.
The Tone Wheeel teeth should be perfectly square, not bent, or nicked.

Is the Right Front Tone Wheel/bearing damaged ?

Yes, repair as necessary.
No, go to step 7.

Step 7. Check Right Front wheel bearing for damage
Inspect the Right Front wheel bearing for excessive runout or clearance.
Refer the appropriate service information, if necessary, for procedures or specifications.

Is the Right Front Wheel bearing damaged ?

Yes, repair as necessary.
No, go to step 8.

Step 8. Right Front wheel speed sensor
Replace the Right Wheel speed sensor, road test the vehicle over 40 km/h (25 mph).
Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.
With the scan tool, read ABS DTC.

Did DTC C101C-Right Front Wheel Speed sensor signal erratic performance reset ?

Yes, replace the Antilock Brake System (ABS) Module. Perform the ABS Verification Test. 
No, test complete for DTC C101C-Right Front Wheel speed sensor signal erratic performance.

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