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C121C Chrysler Code - Torque Request Signal Denied

Quick Answer

The C121C Chrysler code indicates that the torque request signal from the engine control module (ECM) has been denied. Common causes include Faulty wiring or connectors, Malfunctioning ECM or TCM, Sensor issues (e.g., throttle position sensor, transmission speed sensor). 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 wiring or connectors, Malfunctioning ECM or TCM, Sensor issues (e.g., throttle position sensor, transmission speed sensor).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code C121C Chrysler Description

The C121C Chrysler code indicates that the torque request signal from the engine control module (ECM) has been denied. In simpler terms, this means that the vehicle's ECM has requested a specific amount of torque from the engine, but the signal has been rejected or not properly received by another module in the vehicle's system. This issue can have significant implications for the vehicle's performance and overall driving experience.

OBDII Code C121C Chrysler - Torque Request Signal Denied
C121C Chrysler Code - Torque Request Signal Denied

Common Causes of C121C Chrysler

  1. Faulty wiring or connectors
  2. Malfunctioning ECM or TCM
  3. Sensor issues (e.g., throttle position sensor, transmission speed sensor)
  4. Software glitches within the vehicle's computer systems
  5. Poor electrical connections or grounds

Symptoms of C121C Chrysler

  1. Lack of power or acceleration
  2. Rough idling or stalling
  3. Difficulty shifting gears
  4. Decreased fuel efficiency
  5. Increased emissions

How to Fix C121C Chrysler

  1. Perform a thorough diagnostic scan to retrieve the trouble codes and pinpoint the exact cause of the torque request signal denial.
  2. Inspect the wiring, connectors, and sensors related to the torque request signal to check for any damage or corrosion.
  3. Test the ECM and TCM functionality to ensure they are communicating properly and sending/receiving signals as intended.
  4. Replace any faulty components, such as sensors or modules, that are identified as the root cause of the issue.
  5. Clear the trouble codes from the vehicle's computer system and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix C121C Chrysler

The typical repair costs for addressing the C121C Chrysler code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, expect to pay anywhere from $200 to $500 for parts and labor to resolve this problem. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to get a few quotes from different shops to ensure you're getting a fair price. Additionally, factors such as location, vehicle make and model, and engine type can influence the overall repair costs.

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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.

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