AutoCodes – Chrysler – C121D Chrysler

C121D Chrysler Code - Brake Pressure Sensor Circuit

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Brake Pressure Sensor. Common causes include Faulty Brake Master Cylinder, Faulty Brake Booster, Faulty Anti-Lock Brake System (ABS) Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C121D Chrysler indicates Brake Pressure Sensor Circuit.
Common causes: Common causes include Faulty Brake Master Cylinder, Faulty Brake Booster, Faulty Anti-Lock Brake System (ABS) Module.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 6,243

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C121D Chrysler Description

The Anti-Lock Brake System (ABS) Module monitors the Brake Pressure Sensor. The ABS Module sets the OBDII code when the Brake Pressure Sensor is not to factory specifications.

OBDII Code C121D Chrysler - Brake Pressure Sensor Circuit - AutoCodes.com — C121D Chrysler Code - Brake Pressure Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC C121D Chrysler?

Faulty Brake Master Cylinder
Faulty Brake Booster
Faulty Anti-Lock Brake System (ABS) Module
Anti-Lock Brake System (ABS) Module harness is open or shorted
Anti-Lock Brake System (ABS) Module circuit poor electrical connection

How to Fix the DTC C121D Chrysler?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C121D Chrysler code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

Get the C121D Chrysler code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C121D Chrysler Code

1. What are common symptoms of OBDII code C121D in a Chrysler related to the brake pressure sensor circuit?

- Common symptoms include the ABS warning light illuminating on the dashboard, loss of ABS functionality, and potential issues with the vehicle's braking system.

2. What are some possible causes of OBDII code C121D in a Chrysler related to the brake pressure sensor circuit?

- Possible causes may include a faulty brake pressure sensor, wiring issues in the circuit, a malfunctioning ABS module, or low brake fluid levels.

3. How can I diagnose OBDII code C121D in a Chrysler related to the brake pressure sensor circuit?

- Diagnosis typically involves using an OBDII scanner to retrieve the fault code, performing a visual inspection of the brake pressure sensor and its wiring, and conducting further tests using a multimeter if needed.

4. Is it safe to continue driving my Chrysler with OBDII code C121D related to the brake pressure sensor circuit?

- It is not recommended to continue driving the vehicle with this code illuminated, as it may compromise the effectiveness of the braking system and ABS functionality.

5. Can I reset OBDII code C121D in my Chrysler related to the brake pressure sensor circuit by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is important to diagnose and address the root cause of the issue to prevent the code from reappearing.

6. How can I repair OBDII code C121D in my Chrysler related to the brake pressure sensor circuit?

- Repair options may include replacing the faulty brake pressure sensor, repairing damaged wiring, resetting the ABS module, or addressing any other underlying issues identified during diagnosis.

7. Are there any DIY tips for troubleshooting OBDII code C121D related to the brake pressure sensor circuit in a Chrysler?

- DIY tips may include checking the brake fluid level, inspecting the brake pressure sensor for physical damage, and ensuring proper connections in the sensor circuit.

8. Will fixing OBDII code C121D related to the brake pressure sensor circuit in my Chrysler require specialized tools?

- Depending on the exact cause of the issue, fixing the code may require basic tools such as a multimeter, socket set, and OBDII scanner, along with specific tools for accessing and testing the brake pressure sensor.

9. How long does it typically take to repair OBDII code C121D in a Chrysler related to the brake pressure sensor circuit?

- The repair time can vary based on the specific cause of the code, but it may take anywhere from a few hours to a full day to diagnose and address the issue effectively.

10. Can a mechanic help me with diagnosing and repairing OBDII code C121D related to the brake pressure sensor circuit in my Chrysler?

- Yes, a qualified mechanic with experience in handling ABS and brake system issues can assist in diagnosing and repairing OBDII code C121D to ensure the safety and proper functionality of your vehicle.