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U1421 Dodge Code - Implausible Ignition Key Off Time Received

Quick Answer

The U1421 diagnostic trouble code (DTC) for Dodge vehicles indicates an "Implausible Ignition Key Off Time Received" error. Common causes include Faulty ignition switch sensors, Wiring issues or shorts in the electrical system, Malfunctioning Engine Control Module (ECM). 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 Dodge indicates Implausible Ignition Key Off Time Received.
Common causes
Common causes include Faulty ignition switch sensors, Wiring issues or shorts in the electrical system, Malfunctioning Engine Control Module (ECM).
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 12, 2024
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Code U1421 Dodge Description

The U1421 diagnostic trouble code (DTC) for Dodge vehicles indicates an "Implausible Ignition Key Off Time Received" error. This means that the Engine Control Module (ECM) has detected an inconsistency in the data related to the time the ignition key has been turned off. In simpler terms, the ECM is receiving information that does not align with the expected parameters for the ignition key being turned off, which can lead to various issues within the vehicle's systems.

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

Common Causes of U1421 Dodge

  1. Faulty ignition switch sensors
  2. Wiring issues or shorts in the electrical system
  3. Malfunctioning Engine Control Module (ECM)
  4. Communication error between ECM and other control modules
  5. Faulty ignition key cylinder

Symptoms of U1421 Dodge

  1. Difficulty starting the engine
  2. Engine stalling unexpectedly
  3. Rough idling or misfiring
  4. Decreased fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix U1421 Dodge

  1. Begin by connecting a diagnostic scanner to retrieve the specific details of the U1421 code and verify the issue.
  2. Inspect the ignition switch sensors and wiring for any signs of damage or malfunction. Replace any faulty components.
  3. Check for loose connections or corrosion in the electrical system and address any issues found.
  4. If necessary, reprogram or replace the Engine Control Module (ECM) to ensure proper communication with the ignition system.
  5. Test the vehicle to confirm that the issue has been resolved and clear the DTC codes from the ECM memory.

Cost to Fix U1421 Dodge

The cost of repairing the U1421 code for an "Implausible Ignition Key Off Time Received" error can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this type of problem can range from $150 to $500, including parts and labor. It's essential to factor in additional diagnostic time and potential component replacements when budgeting for this repair. Keep in mind that rates at auto repair shops can fluctuate based on location, vehicle make and model, and the complexity of the repair. Consider obtaining quotes from multiple mechanics to find the best price for your specific situation.

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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 Dodge Code

1. What are the common symptoms of OBDII code U1421 in a Dodge vehicle?

The common symptoms include issues with starting the vehicle, intermittent stalling, and the engine running rough.

2. What does the OBDII code U1421 Dodge mean?

The code U1421 indicates an implausible ignition key off time received by the vehicle's powertrain control module (PCM).

3. What are the possible causes of the U1421 code in a Dodge?

Potential causes include a faulty ignition switch, a wiring issue in the ignition system, a malfunctioning PCM, or a communication error between modules.

4. How can I diagnose the U1421 code in my Dodge?

Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, inspecting the ignition system components, and testing the PCM and communication circuits.

5. Is it safe to drive with the U1421 fault code present in a Dodge vehicle?

It is generally not recommended to drive with the U1421 code present, as it can lead to unpredictable engine behavior and potential safety hazards.

6. Can I reset the U1421 code in my Dodge without fixing the underlying issue?

While you can clear the code with a diagnostic scanner, it is crucial to address the root cause to prevent the code from reappearing and to ensure proper vehicle operation.

7. How much does it typically cost to repair the U1421 code in a Dodge?

The cost of repair can vary depending on the specific cause of the code, but it may involve replacing the ignition switch, repairing wiring issues, or reprogramming the PCM. Costs can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast fix the U1421 code issue in a Dodge?

DIY enthusiasts with experience in automotive repair and access to the necessary tools may be able to diagnose and address simpler causes of the U1421 code, such as checking and repairing wiring connections.

9. How urgent is it to address the U1421 fault code in a Dodge?

It is advisable to address the U1421 code promptly to prevent potential drivability issues, further damage to engine components, and ensure the safety and reliability of the vehicle.

10. Will the U1421 code cause my Dodge to fail an emissions test?

The U1421 code alone may not cause a vehicle to fail an emissions test, but it is essential to address the underlying issue to maintain proper engine performance and emissions control.

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