C121A-09 DODGE, CHRYSLER 300 Steering Angle Sensor Not Initialized - Component Failure

C121A-09 DODGE, CHRYSLER 300 Steering Angle Sensor Not Initialized - Component Failure. Repair any Steering Control Module (SCM) or loss of communication DTCs first before continuing with this test.

C121A-09 Steering Angle Sensor Not Initialized - Component Failure

When monitored code C121A-09

  • Ignition on.
  • No under voltage DTCs.

Set conditions code C121A-09

  • Antilock Brake System (ABS) Module detects a low voltage at the steering angle sensor.
  • Steering angle sensor failure.

Default actions code C121A-09

  • ABS is disabled.

Possible causes code C121A-09

  • Terminal/connector/wiring harness damage.
  • Clockspring (SAS).
  • Antilock Brake System (ABS) Module.


Diagnose code C121A-09 Steering Angle Sensor Not Initialized - Component Failure


Step 1. Initialize ABS Module

Turn the ignition on, with the scan tool, read ABS DTC.

Warning: To avoid possible serious or fatal injury, check brake capability is available before road testing.

Note: When performing the BAS Initialization routine, the vehicle temperature must be above 10°C (50°F).

Initialize the BAS Module, perform the ABS Verification Test. Park the vehicle.

Was the ABS Module initialization seccessful?

YES, go to step 2.
NO, perform the ABS Module initialization routine again, if still unsuccessful. Go to step 3.

Step 2. Check for an active DTC

Turn the ignition on, with the scan tool, erase the DTCs.

Warning: To avoid possible serious or fatal injury, check brake capability is available before road testing.

Test drive the vehicle by turning the vehicle left and right in a curving manner a velocity between 15 and 35 km/h (9 and 22 mph). Park the vehicle, with the scan tool, read ABS DTCs.

Is the DTC active?

YES, go to step 3.
NO, test complete.

Step 3. Steering angle sensor

Turn the ignition off, replace the Steering Angle Sensor (SAS). Perform the ABS Verification Test.

Warning: To avoid possible serious or fatal injury, check brake capability is available before road testing.

 Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph). With the scan tool, read the DTCs.

Does the DTC remain active?

YES, replace the Antilock Brake System (ABS) Module. Perform the ABS Verification Test.
NO, test complete for code C121A-09 Steering Angle Sensor Not Initialized - Component Failure.

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