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U1421 Chrysler Code - Implausible Ignition Key Off Time Received

Quick Answer

The U1421 Chrysler diagnostic trouble code (DTC) refers to an "Implausible Ignition Key Off Time Received." This code indicates that the vehicle's onboard computer has detected a discrepancy or inconsistency in the amount of time the ignition key has been in the off position. Common causes include Faulty ignition switch, Malfunctioning key fob or key sensor, Wiring issues or electrical faults. 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
U1421 Chrysler indicates Implausible Ignition Key Off Time Received.
Common causes
Common causes include Faulty ignition switch, Malfunctioning key fob or key sensor, Wiring issues or electrical faults.
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 U1421 Chrysler Description

The U1421 Chrysler diagnostic trouble code (DTC) refers to an "Implausible Ignition Key Off Time Received." This code indicates that the vehicle's onboard computer has detected a discrepancy or inconsistency in the amount of time the ignition key has been in the off position. In modern vehicles, the ignition key off time is used by various systems to determine when to power down or enter sleep mode. When the computer receives an implausible ignition key off time signal, it may not be able to accurately control certain functions, leading to potential performance issues.

OBDII Code U1421 Chrysler - Implausible Ignition Key Off Time Received
U1421 Chrysler Code - Implausible Ignition Key Off Time Received

Common Causes of U1421 Chrysler

  1. Faulty ignition switch
  2. Malfunctioning key fob or key sensor
  3. Wiring issues or electrical faults
  4. Problem with the body control module (BCM)

Symptoms of U1421 Chrysler

  1. Difficulty starting the vehicle
  2. Intermittent stalling or engine misfires
  3. Erratic behavior of electronic components (lights, radio, etc.)
  4. Loss of power or performance issues

How to Fix U1421 Chrysler

  1. Diagnose the issue using a diagnostic scanner to retrieve the specific trouble code and pinpoint the source of the problem.
  2. Inspect the ignition switch, key fob, and key sensor for any visible damage or malfunctions.
  3. Check the wiring connections and electrical components related to the ignition system for any loose connections or shorts.
  4. Replace any faulty components, such as the ignition switch, key fob, key sensor, or BCM, as needed.
  5. Clear the DTC from the vehicle's computer and test the vehicle to ensure the issue has been resolved.

Cost to Fix U1421 Chrysler

The typical repair costs for addressing a U1421 Chrysler code can vary depending on the specific cause of the issue and the required repairs. On average, the cost of replacing an ignition switch can range from $150 to $300, while replacing a key fob or sensor may cost between $50 and $200. If the issue is related to wiring or electrical faults, the repair costs can vary significantly based on the extent of the damage and the time required for diagnosis and repair. Overall, the total repair cost, including parts and labor, can range from $200 to $500 or more. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple shops to ensure a competitive price.

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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 U1421 Chrysler Code

1. What does the OBDII code U1421 for Chrysler mean?

The U1421 code indicates an issue with the Ignition Key Off Time Received that is deemed implausible by the vehicle's computer system.

2. What are the common symptoms associated with code U1421?

Common symptoms may include intermittent starting problems, engine stalling, and issues with the vehicle's immobilizer system.

3. What are the possible causes of the U1421 code?

Potential causes of the U1421 code can include a faulty ignition key, a problem with the key fob, issues with the immobilizer system, or a malfunction in the vehicle's electronic control module.

4. How can I diagnose the U1421 code?

Diagnosing the U1421 code typically involves using a diagnostic scanner to retrieve the code and checking the ignition system components for any visible damage or faults.

5. Can I still drive my vehicle with the U1421 code present?

It is not recommended to drive your vehicle with the U1421 code present, as it can lead to potential starting and stalling issues that may affect the safety and performance of the vehicle.

6. How can I repair the U1421 code?

Repairing the U1421 code may involve resetting the fault code with a diagnostic scanner, replacing the ignition key or key fob, checking and repairing any wiring or connection issues, or reprogramming the vehicle's electronic control module.

7. Do I need a professional mechanic to fix the U1421 code?

While some simple fixes like checking the key and resetting the code can be done by the vehicle owner, more complex issues related to the immobilizer system or electronic control module may require the expertise of a professional mechanic.

8. How much does it cost to repair the U1421 code?

The cost of repairing the U1421 code can vary depending on the underlying cause of the issue, the parts needed for replacement, and the labor costs charged by the mechanic or dealership.

9. Can the U1421 code reoccur after repairs?

If the root cause of the U1421 code is not properly addressed during repairs, it is possible for the code to reoccur. Therefore, it's essential to diagnose the issue accurately and fix it completely to prevent future occurrences.

10. Is the U1421 code a serious problem?

While the U1421 code may not always cause immediate vehicle breakdown, it can lead to starting and stalling issues that affect the drivability and safety of the vehicle. It is recommended to address the problem promptly to avoid further complications.

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