AutoCodes – Chrysler – C121C Chrysler

C121C Chrysler Code - Torque Request Signal Denied

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Yaw Control/Traction Control System. Common causes include Faulty Anti-Lock Brake System (ABS) Module, Faulty Powertrain Control Module (PCM). 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: C121C Chrysler indicates Torque Request Signal Denied.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Module, Faulty Powertrain Control Module (PCM).
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 12,129

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C121C Chrysler Description

The Anti-Lock Brake System (ABS) Module monitors the Yaw Control/Traction Control System. The ABS Module sets the OBDII code if engine management relevant for Automatic Yaw Control/Traction Control System control can be accomplished.

OBDII Code C121C Chrysler - Torque Request Signal Denied - AutoCodes.com — C121C Chrysler Code - Torque Request Signal Denied

What does this mean?

What are the Possible Causes of the DTC C121C Chrysler?

Faulty Anti-Lock Brake System (ABS) Module
Faulty Powertrain Control Module (PCM)

How to Fix the DTC C121C 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 C121C 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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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 C121C Chrysler Code

1. What are common symptoms of OBDII code C121C in a Chrysler vehicle?

- Common symptoms include the engine stalling, loss of power, and issues with acceleration.

2. What does the OBDII code C121C Chrysler Torque Request Signal Denied mean?

- This code indicates that the engine control module (ECM) has denied a torque request from another module in the vehicle.

3. What are possible causes of the C121C code in a Chrysler vehicle?

- Possible causes include a faulty ECM, issues with the torque request signal circuit, or problems with related sensors or components.

4. How can I diagnose the C121C code in my Chrysler vehicle?

- Diagnosing the C121C code typically involves using a scan tool to retrieve the code, checking the related circuits and components for any faults, and performing a thorough inspection.

5. Can I still drive my Chrysler vehicle with the C121C code present?

- It is not recommended to drive the vehicle with the C121C code present, as it can lead to further damage and safety risks. It's best to address the issue promptly.

6. How can I repair the C121C code in my Chrysler vehicle?

- Repairing the C121C code may involve repairing or replacing the faulty ECM, addressing issues with the torque request signal circuit, or fixing any related sensor or component problems.

7. Is it possible to reset the C121C code in a Chrysler vehicle without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Are there any maintenance tips to prevent the C121C code from appearing in my Chrysler vehicle?

- Regular maintenance, including checking and replacing sensors, maintaining the ECM, and ensuring all electrical connections are secure, can help prevent the C121C code from appearing.

9. Will the C121C code cause my Chrysler vehicle to fail an emissions test?

- Yes, the C121C code can cause your vehicle to fail an emissions test, as it indicates a problem with the engine control system.

10. Can a DIY enthusiast without extensive automotive experience fix the C121C code in a Chrysler vehicle?

- While some aspects of addressing the C121C code may be within reach of a DIY enthusiast, it is generally recommended to seek assistance from a professional mechanic due to the complexity of the issue.