AutoCodes – Chrysler – C121E Chrysler

C121E Chrysler Code - Brake Pressure Sensor Comparative Performance

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Brake Pressure Sensor. Common causes include Air in Brake System, Faulty Brake Switch, Brake Switch harness is open or shorted. 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: C121E Chrysler indicates Brake Pressure Sensor Comparative Performance.
Common causes: Common causes include Air in Brake System, Faulty Brake Switch, Brake Switch harness is open or shorted.
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 7,172

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 C121E 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 C121E Chrysler - Brake Pressure Sensor Comparative Performance - AutoCodes.com — C121E Chrysler Code - Brake Pressure Sensor Comparative Performance

What does this mean?

What are the Possible Causes of the DTC C121E Chrysler?

Air in Brake System
Faulty Brake Switch
Brake Switch harness is open or shorted
Brake Switch circuit poor electrical connection
Faulty Anti-Lock Brake System (ABS) Module

How to Fix the DTC C121E 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 C121E 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.

Need more information about the C121E Chrysler code?

Need more information on how to fix the C121E Chrysler code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C121E 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 C121E Chrysler Code

1. What does OBDII code C121E Chrysler mean?

The OBDII code C121E for Chrysler indicates an issue with the Brake Pressure Sensor Comparative Performance.

2. What are the common symptoms of OBDII code C121E?

Common symptoms of OBDII code C121E may include the ABS warning light illuminating on the dashboard, issues with brake performance, and potential traction control system malfunctions.

3. What are the possible causes of OBDII code C121E in a Chrysler vehicle?

Possible causes of OBDII code C121E in a Chrysler vehicle may include a faulty brake pressure sensor, wiring issues, sensor calibration problems, or issues with the ABS module.

4. How can I diagnose the OBDII code C121E in my Chrysler?

Diagnosing OBDII code C121E typically involves using a diagnostic scanner to retrieve the code, checking the brake pressure sensor and its wiring for any visible damage, and performing a sensor calibration if necessary.

5. Can I still drive my Chrysler with OBDII code C121E present?

It is not recommended to drive your Chrysler with OBDII code C121E present, as it can affect the proper functioning of the ABS and traction control systems, potentially compromising your safety on the road.

6. How can I repair OBDII code C121E in my Chrysler?

Repairing OBDII code C121E may involve replacing the faulty brake pressure sensor, repairing any damaged wiring, performing a sensor calibration, or reprogramming the ABS module as needed.

7. Is it safe to continue driving if the ABS warning light is on due to OBDII code C121E?

Driving with the ABS warning light on due to OBDII code C121E is not recommended, as it indicates potential issues with the brake system that can impact your vehicle's safety and performance.

8. Can OBDII code C121E be reset without fixing the underlying issue?

While you can clear the OBDII code C121E with a diagnostic scanner, it is important to address the underlying issue causing the code to prevent further safety and performance issues with your Chrysler.

9. How much does it typically cost to repair OBDII code C121E in a Chrysler?

The cost of repairing OBDII code C121E in a Chrysler can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can I prevent OBDII code C121E from occurring in my Chrysler?

Regular maintenance, including brake system inspections and servicing, can help prevent OBDII code C121E from occurring in your Chrysler by ensuring the proper functioning of the brake pressure sensor and related components.