[SOLVED] Dodge C121D Code: Quick Fix For Brake Pressure Sensor

The OBD code C121D for Dodge indicates a fault in the AntiLock Brake System (ABS) Module.

Symptoms include the ABS Warning Light and Engine Light being illuminated.

Possible causes are a faulty Brake Master Cylinder, Brake Booster, ABS Module, or issues with the ABS Module harness or circuit connection.

This issue should be addressed promptly to ensure safe braking operation.

A potential fix involves inspecting and repairing any damaged components or wiring connections related to the ABS system.

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

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Symptoms of the Dodge c121d OBD Code

The Dodge C121D fault code typically triggers when there is an issue with the ABS pump motor circuit.

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 than usual.
Unusual noises coming from the ABS system.

Causes of the Dodge c121d OBD Code

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Possible triggers for Dodge fault code C121D include ABS module issues or wheel speed sensor malfunctions.

C121D can be caused by a faulty Brake Master Cylinder.
A faulty Brake Booster.
A faulty AntiLock Brake System (ABS) Module.
An AntiLock Brake System (ABS) Module harness that is open or shorted.
An AntiLock Brake System (ABS) Module circuit with poor electrical connection.

Fixing Dodge Error Code c121d Step By Step

Resolve the Dodge C121D fault code by inspecting the wheel speed sensor circuit for issues.

To fix the Dodge OBDII code C121D, start by reviewing the possible causes and visually inspecting the wiring harness and connectors.
Check for any damaged components and examine the connector pins for signs of being broken, bent, pushed out, or corroded.
Next, perform a thorough check of the wheel speed sensors and their wiring for any issues.
Test the wheel speed sensor signals using a scan tool to identify any faulty sensors.
Replace any faulty wheel speed sensors or repair any damaged wiring as necessary.
Finally, clear the fault codes and test drive the vehicle to ensure the issue has been resolved.

Cost Of Fixing Dodge c121d Fault Code

The repair for Dodge fault code C121D may involve replacing the ABS pump motor circuit.

The cost to diagnose and fix the Dodge OBD code C121D typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.

Costs depend on shop rates, complexity of the issue, and any additional parts or labor needed for the repair.

Details of the Dodge c121d OBD Code

Dodge fault code C121D relates to the steering angle sensor.

Dodge OBD code C121D indicates an ABS pump motor supply low voltage fault.

This fault is triggered by the ABS module when it detects that the voltage supplied to the ABS pump motor is below the specified threshold.

The ABS pump motor is involved in the vehicle’s antilock braking system, which helps prevent wheel lockup during braking.

When this fault occurs, it can affect the proper operation of the ABS system, potentially compromising vehicle safety.

Mechanic’s Tech Notes

For Dodge code C121D, check the wheel speed sensor circuit for issues causing erratic speed readings.

To diagnose and fix OBDII code C121D on a Dodge, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.

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

If the TCM does not respond, reprogramming or reflashing may be necessary.

Visually inspect the wiring harness and connectors for any damage, focusing on broken, bent, or corroded pins.

Ensure all connections are secure.

If the issue persists, consider consulting a professional for further diagnosis and repair.

FAQ

1. What does OBD code C121D indicate in a Dodge vehicle?

OBD code C121D in a Dodge indicates an issue with the AntiLock Brake System (ABS). Check brake components, wiring, and connectors for faults.

2. What are the common symptoms associated with OBD code C121D in a Dodge?

Common symptoms for OBD code C121D in a Dodge include ABS warning light on, engine light on. Causes may be faulty brake components. Fix: Inspect and repair as needed.

3. How can I diagnose and repair OBD code C121D in my Dodge vehicle?

Diagnose and repair OBD code C121D in Dodge: Symptoms ABS & Engine Lights ON. Causes Faulty Brake Master Cylinder, Booster, ABS Module. Fix Inspect wiring, connectors, components.

Wrap Up

If your Dodge is displaying OBD code c121d and you’re experiencing issues with the ABS system, it could be caused by a faulty wheel speed sensor, damaged wiring harness, or poor electrical connection at the sensor.

To address Dodge OBD code c121d, start by inspecting the wheel speed sensor and its wiring for any visible damage.

Test the sensor’s resistance and check the connectors for corrosion or looseness.

Replace the sensor if necessary and ensure proper connection to resolve the ABS system problem.