[SOLVED] C121C Code: Resolve Torque Request Signal Denial

The OBD code C121C indicates a communication error between the AntiLock Brake System (ABS) module and the Powertrain Control Module (PCM).

Symptoms include the ABS warning light and engine light being illuminated.

This issue is commonly caused by a faulty ABS module or PCM.

It is important to visually inspect wiring harnesses, connectors, and component integrity.

Fix potential issues with wiring or replace faulty modules as needed.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Symptoms of the c121c OBD Code

The vehicle displays an ABS warning light on the dashboard.

Symptoms: AntiLock Brake System (ABS) Warning Light ON.
Engine Light ON (or Service Engine Soon Warning Light).
Possible loss of ABS functionality.
Brake pedal may feel different during braking.
Difficulty maintaining traction in slippery conditions.

Causes of the c121c OBD Code

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Possible issues related to fault code C121C include ABS module failure or wheel speed sensor problems.

C121C can be caused by a faulty AntiLock Brake System (ABS) Module.
A faulty Powertrain Control Module (PCM).

Fixing Error Code c121c Step By Step

To address fault code C121C, inspect the brake switch and wiring for potential issues.

To fix OBDII code C121C, first, review the possible causes mentioned above and visually examine the corresponding wiring harness and connectors.
Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Next, perform a thorough inspection of the ABS module and its connections.
Check for any loose or damaged wiring leading to the module.
If no issues are found with the wiring, consider reprogramming or replacing the ABS module as necessary.
Finally, clear the fault code using a diagnostic scanner and test drive the vehicle to ensure the issue has been resolved.

Cost Of Fixing c121c Fault Code

Diagnosing and repairing fault code C121C may involve inspecting and servicing the ABS system components.

The cost to diagnose and fix OBD code C121C depends on the estimated 1. 0hour repair time.

Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Costs may vary based on shop rates and the complexity of the repair needed.

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Details of the c121c OBD Code

C121C code indicates a steering angle sensor calibration error in the vehicle’s system.

OBD code C121C means there is a steering angle sensor not initialized.

This code is triggered by the ABS module when it detects that the steering angle sensor has not been calibrated or initialized properly.

The steering angle sensor is a critical component of the vehicle’s stability control system, as it provides information on the steering wheel angle and rate of turn.

When the sensor is not initialized correctly, it can lead to issues with the vehicle’s stability control system and ABS operation.

Mechanic’s Tech Notes

Code C121C indicates a steering angle sensor not initialized or calibrated properly.

OBDII code C121C indicates a fault in the torque request signal denied.

To diagnose, check the Transmission Control Module (TCM) power and ground using a multimeter.

Verify TCM communication over the Controller Area Network (CAN) using a scan tool.

Visually inspect wiring harnesses and connectors for damage, and ensure connector pins are intact and free of corrosion.

Reflashing the TCM may be necessary to resolve the issue.

FAQ

1. What does OBD code C121C indicate in a vehicle?

OBD code C121C indicates a fault in the AntiLock Brake System (ABS) module or Powertrain Control Module (PCM). Check wiring and connectors for damage.

2. What are the common symptoms associated with OBD code C121C?

Common symptoms for OBD code C121C include ABS warning light on, engine light on. Causes may be faulty ABS module or PCM. Inspect wiring and connectors for damage.

3. How can I diagnose and repair OBD code C121C in my vehicle?

Diagnose OBD code C121C by checking ABS module and PCM for faults. Inspect wiring harness and connectors for damage or corrosion.

Wrap Up

If your ABS light is on and you see OBDII code c121c, it may indicate an issue with the steering angle sensor.

This could be caused by a faulty sensor, damaged wiring, or poor connections in the steering angle sensor circuit.

To address OBDII code c121c, check the wiring harness and connectors related to the steering angle sensor.

Look for any signs of damage, corrosion, or loose connections.

Consider replacing the steering angle sensor if necessary to resolve the problem.