C121E Brake Pressure Sensor comparative performance

C121E Brake Pressure Sensor comparative performance - With the ignition on, when the Antilock Brake System (ABS) Module indicates that the Brake Pressure Sensor is out of range.

C121E-Brake Pressure Sensor comparative performance


Possible causes C121E code
  • ECU internal failure.
  • HCU internal failure.

Diagnose C121E-Brake Pressure Sensor comparative performance

Step 1. Check for a DTC C121E-Brake Pressure Sensor comparative performance
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 the DTC. With the scan tool, read and record the Environmental Data to help identify the conditions in which the DTC was set.
With the scan tool, erase the DTC, start the engine. Slowly press and release the brake pedal, with the scan tool, read and record the DTC.

Does the scan tool display C121E-Brake Pressure Sensor comparative performance ?

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

Step 2. HCU/ECU isolation
Turn the ignition off, separate the ECU from the HCU. Turn the ignition on, with the scan tool, monitor the brake pressure.

Does the scan tool display brake pressure above 218 bar (3162 psi) ?

Yes, replace the HCU, perform the ABS Verification Test.
No, replace the ECU, perform the ABS Verification Test.

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