AutoCodes – Chrysler – C1420 Chrysler

C1420 Chrysler Code - Rear Differential Control Circuit Current Performance

Quick Answer

The Final Differential Control Module (FDCM) monitors the Rear Differential Solenoid. Common causes include Faulty Final Differential Control Module (FDCM), Final Differential Control Module (FDCM) harness is open or shorted, Final Differential Control Module (FDCM) circuit poor electrical connection. 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: C1420 Chrysler indicates Rear Differential Control Circuit Current Performance.
Common causes: Common causes include Faulty Final Differential Control Module (FDCM), Final Differential Control Module (FDCM) harness is open or shorted, Final Differential Control Module (FDCM) circuit poor electrical connection.
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 890

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 Sep 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1420 Chrysler Description

The Final Differential Control Module (FDCM) monitors the Rear Differential Solenoid. The FDCM sets the OBDII code when the Rear Differential Solenoid is not to factory specifications.

OBDII Code C1420 Chrysler - Rear Differential Control Circuit Current Performance - AutoCodes.com — C1420 Chrysler Code - Rear Differential Control Circuit Current Performance

What does this mean?

What are the Possible Causes of the DTC C1420 Chrysler?

Faulty Final Differential Control Module (FDCM)
Final Differential Control Module (FDCM) harness is open or shorted
Final Differential Control Module (FDCM) circuit poor electrical connection

How to Fix the DTC C1420 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 C1420 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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Get the C1420 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 C1420 Chrysler Code

1. What does the OBDII code C1420 mean on a Chrysler vehicle?

C1420 indicates an issue with the Rear Differential Control Circuit, specifically related to its current performance, suggesting an electrical fault or malfunction in the system.

2. What are common symptoms of the C1420 code?

Symptoms may include the Check Engine Light or service light illuminating, reduced traction control performance, or unusual noises or behaviors from the rear differential.

3. What causes the C1420 code to appear?

Possible causes include a faulty rear differential actuator, damaged wiring or connectors in the control circuit, a blown fuse, or a malfunctioning control module.

4. Is it safe to drive with the C1420 code active?

While the vehicle may still be drivable, traction control or all-wheel drive functionality could be impaired, potentially affecting handling in slippery conditions.

5. How can I diagnose the C1420 code?

Start by inspecting the wiring and connectors for damage or corrosion, check the rear differential actuator for proper operation, and use a multimeter to test electrical continuity in the circuit.

6. Can a blown fuse cause the C1420 code?

Yes, a blown fuse in the differential control circuit can interrupt power and trigger the C1420 code.

7. How do I fix the C1420 code on my Chrysler?

Repairs may involve replacing a damaged rear differential actuator, repairing or replacing faulty wiring, or resetting the control module after resolving the issue.

8. Can a software update fix the C1420 code?

In rare cases, a software update for the vehicle's control module may resolve the issue if it's related to a programming error.

9. What tools are needed to fix the C1420 code?

You may need an OBDII scanner, a multimeter for electrical testing, and basic tools to access and inspect the rear differential components.

10. How much does it cost to repair the C1420 code?

Repair costs can vary, ranging from $100-$500 depending on whether it's a simple wiring repair or the replacement of a rear differential actuator or module.