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Engine-Codes – Generic – U1420

U1420 Code - Implausible Electronic Gear Select Signal Received

Quick Answer

The U1420 diagnostic trouble code (DTC) indicates that an implausible electronic gear select signal has been received by the vehicle's onboard computer system. Common causes include Faulty electronic gear select sensor, Wiring issues in the electronic gear select system, Transmission control module malfunction. 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
U1420 indicates Implausible Electronic Gear Select Signal Received.
Common causes
Common causes include Faulty electronic gear select sensor, Wiring issues in the electronic gear select system, Transmission control module malfunction.
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 06, 2024
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Code U1420 Description

The U1420 diagnostic trouble code (DTC) indicates that an implausible electronic gear select signal has been received by the vehicle's onboard computer system. This code is typically associated with vehicles that have an automatic transmission with an electronic gear shift mechanism. When this code is triggered, it means that the computer has detected a discrepancy between the gear selected by the driver and the gear that the transmission is actually in. This can lead to issues with shifting, performance, and overall drivability of the vehicle.

OBDII Code U1420 - Implausible Electronic Gear Select Signal Received
U1420 Code - Implausible Electronic Gear Select Signal Received

Common Causes of U1420

  1. Faulty electronic gear select sensor
  2. Wiring issues in the electronic gear select system
  3. Transmission control module malfunction
  4. Software glitch in the onboard computer system

Symptoms of U1420

  1. Difficulty shifting gears
  2. Erratic shifting patterns
  3. Transmission not engaging
  4. Check engine light illuminated on the dashboard

How to Fix U1420

  1. Diagnose the issue using a professional OBD-II scanner to pinpoint the exact cause of the U1420 code.
  2. Inspect the electronic gear select sensor and wiring for any signs of damage or corrosion. Replace any faulty components.
  3. Check the transmission control module for proper functioning and reprogram if necessary.
  4. Clear the DTC from the computer's memory and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, consult a professional mechanic for further diagnostic testing and potential repair.

Cost to Fix U1420

The typical repair costs for addressing the U1420 code can range from $200 to $500, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary depending on factors such as location, vehicle make and model, and engine type. It is recommended to check local rates for a more accurate estimate.

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Code U1420 Information for Specific Makes

  • U1420 Chrysler — Implausible Electronic Gear Select Signal Received
  • U1420 Dodge — Implausible Electronic Gear Select Signal Received
  • U1420 Jeep — Implausible Electronic Gear Select Signal Received
  • U1420 RAM — Implausible Electronic Gear Select Signal Received
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 U1420 Code

1. What are the common symptoms of OBDII code U1420?

- Common symptoms include issues with shifting gears, difficulty engaging the transmission, and potential sporadic stalling of the vehicle.

2. What can cause the OBDII code U1420 to trigger?

- The code U1420 can be triggered by a faulty gear selector switch, wiring issues in the gear selector circuit, or a malfunction in the transmission control module.

3. How can I diagnose the cause of the U1420 code?

- To diagnose the U1420 code, you can use a diagnostic scanner to retrieve the code, inspect the gear selector switch and its wiring for any damage, and perform a thorough examination of the transmission control module.

4. Can a DIYer repair the U1420 code issue?

- Depending on your skill level, you may be able to repair the U1420 code issue yourself by replacing the faulty gear selector switch or repairing any damaged wiring in the circuit. However, for more complex issues with the transmission control module, it's recommended to seek professional help.

5. Are there any simple repair tips for the U1420 code?

- One simple repair tip for the U1420 code is to check and ensure all connections related to the gear selector switch are secure and free from corrosion. Additionally, inspecting the wiring harness for any signs of wear or damage can also help resolve the issue.

6. Can driving with the U1420 code present cause further damage to the vehicle?

- Driving with the U1420 code present can potentially cause further damage to the transmission system if the underlying issue is not addressed promptly. It's recommended to address the code and have the necessary repairs done as soon as possible.

7. Is it safe to continue driving with the U1420 code illuminated?

- It is not recommended to continue driving with the U1420 code illuminated, as it indicates a potential issue with the electronic gear select signal. Continued driving may lead to transmission problems and safety hazards.

8. How much does it typically cost to repair the U1420 code?

- The cost to repair the U1420 code can vary depending on the root cause of the issue and labor rates in your area. Repairs may range from a simple switch replacement costing a couple of hundred dollars to more complex wiring or module repairs costing more.

9. Will resetting the trouble codes make the U1420 code disappear permanently?

- Resetting the trouble codes may temporarily clear the U1420 code, but if the underlying issue is not resolved, the code is likely to reappear. It's crucial to diagnose and address the root cause to prevent the code from recurring.

10. How long does it typically take to repair the U1420 code?

- The time it takes to repair the U1420 code can vary based on the complexity of the issue. Simple repairs like replacing a gear selector switch can be done in a few hours, while more involved repairs involving the transmission control module may take longer and require professional expertise.

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