C121A Steering Angle Sensor not initialized

C121A Steering Angle Sensor not initialized - The Electronic Stability Control (ESC) may also be reffered to as Electronic Stability Program (ESP) depending in the vehicle model year and configuration.
Certain components may also reference ESP, ESC, or use the traction control symbol. When the Antilock Brake System (ABS) Module detect a low voltage at the Steering Angle Sensor (SAS) or Steering Angle Sensor failure.

C121A-Steering Angle Sensor not initialized


Possible causes C121A code

  • Terminal/connector/wiring harness damage.
  • Fused B(+) Circuit open or high resistance.
  • Ground circuit open or high resistance.
  • Clockspring.

Diagnose C121A-Steering Angle Sensor not initialized

Step 1. Check for a DTC C121A-Steering Angle Sensor not initialized
This DTC must be active for the result of this test to be valid.
Turn the ignition on, with the scan tool, read and record DTC. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set. With the scan tool, erase DTC, road test the vehicle over 30 km/h (19 mph) for at least 30 seconds. With the scan tool, read  DTC.

Does the scan tool display C121A-Steering Angle Sensor not initialized ?

Yes, go to step 2.
No, perform the ABS Intermittent condition.

Step 2. Check the terminals/connectors/wiring harness for damage
To avoid serious or fatal injury or vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, Airbag, set belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable yhe SRS. Failure to take the proper precautions could result in accidental airbag deployment.
Proper steering angle sensor installation is crucial for proper operation.

Check the Clockspring/Steering Angle Sensor installation, check all related wiring for bruised, chafed, pierced, or partially broken wires. Check all related connectors for broken, bent, pushed out, or corroded terminals.

Were any problems found ?

Yes, repair as necessary.
No, go to step 3.

Step 3. Check the Fused B(+) Circuit for an open or high resistance
Turn the ignition off, disconnect the Clockspring harness connector. Turn the ignition on, using a 12 Volt test light connected to ground, check the Fused B(+) circuit at the Clockspring harness connector.
The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly ?

Yes, go to step 4.
No, repair the Fused B(+) circuit for an open.

Step 4. Check the ground circuit for an open or high resistance
Turn the ignition off, with a 12 Volt test light connected to B+, check the ground circuit at the Clockspring harness connector.
The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly ?

Yes, replace the Clockspring. Perform the ABS Verification Test.
No, repair the ground circuit for an open.

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