C121C-09 CRYSLER, DODGE JOURNEY/CHARGER, JEEP PATRIOT/COMPAS Torque Request Signal Denied

C121C code - When the Powertrain Control Module indicates, for an extended period of time, that engine management relevant for automatic yaw control/traction control system control can not be accomplished.

Possible causes DTC C121C-09 Torque Request Signal Denied

• Antilock Brake System (ABS) Module.
• Powertrain Control Module (PCM).

Diagnose DTC C121C-09 Torque Request Signal Denied

Step 1. Verify the DTC is active

Note: This DTC must be active for the result of this test to be valid and this DTC may set while driving under severe load conditions.

1. With the ignition on.

2. With the scan tool, read and record DTCs.

3. With the scan tool, read and record environmental data to help identify the conditions in which the DTC was set.

4. With the scan tool, erase DTCs.

5. Cycle the ignition switch from off to on.

6. Start the engine.

7. With the scan tool, read and record DTCs and monitor ESP torque request status.

Is the DTC active at this time?

YES, go to step 2.

NO, perform the ABS Intermittent condition.

Step 2. Check the Powertarin Control Module (PCM) DTCs

With the scan tool, read and record PCM DTCs.

Were any PCM related DTCs found?

YES, refer to sitemaps or labels DTC P Codes (PCM) this site.

NO, go to step 3.

Step 3. ESP Torque request signal

Engine started, with the scan tool, read the allow ESP torque request status bit.

Was the allow ESP torque request showing NOT set?

YES, replace the PCM. Perform the PCM Verification test.

NO, replace the Antilock Brake System (ABS) Module. Perform the ABS Verification Test.

Test complete.

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