AutoCodes – Dodge – U1420 Dodge

U1420 Dodge Code - Implausible Electronic Gear Select Signal Received

Quick Answer

This diagnostic checks for the validity and availability of the Shift Lever Position signal which is sent by the Electronic Shift Module (ESM) via a CAN message. Common causes include Faulty Electronic Shift Module (ESM), Electronic Shift Module (ESM) harness is open or shorted, Electronic Shift Module (ESM) 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: U1420 Dodge indicates Implausible Electronic Gear Select Signal Received.
Common causes: Common causes include Faulty Electronic Shift Module (ESM), Electronic Shift Module (ESM) harness is open or shorted, Electronic Shift Module (ESM) 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 3,499

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 May 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1420 Dodge Description

This diagnostic checks for the validity and availability of the Shift Lever Position signal which is sent by the Electronic Shift Module (ESM) via a CAN message. A CAN signal state is defined for each of five stable lever positions: 'Park', 'Reverse', 'Neutral', 'Drive' and 'Autostick'. CAN signal states are defined for six non-stable positions: 'Up', 'Down', 'P-R', 'R-N', 'N-D' and 'D-A'. The diagnostic checks the validity by verifying the received CAN signal state corresponds to one of the possible lever positions. The diagnostic also checks the availability by verifying the valid bit. When the Shift Lever Position signal is invalid or missing, then the Diagnostic Trouble Code (DTC) U1420 will set. The failure is detected if at least one of the following malfunctions is verified: 1) Signal Not Available Check: When the signal is not available, the ESM sends an SNA default value. If the TCM reads this value, then DTC U1420 is set. 2) Signal Invalid Value Check: If the signal value is equal to a different value than the defined values for the lever position, the Shift Lever Position value is considered not valid, then DTC U1420 is set.

OBDII Code U1420 Dodge - Implausible Electronic Gear Select Signal Received - AutoCodes.com — U1420 Dodge Code - Implausible Electronic Gear Select Signal Received

What does this mean?

What are the Possible Causes of the DTC U1420 Dodge?

Faulty Electronic Shift Module (ESM)
Electronic Shift Module (ESM) harness is open or shorted
Electronic Shift Module (ESM) circuit poor electrical connection
Faulty Powertrain Control Module (PCM)
Faulty Transmission Control Module (TCM)

How to Fix the DTC U1420 Dodge?

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 U1420 Dodge 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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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 Dodge Code

1. What are common symptoms of the U1420 OBDII code in a Dodge vehicle?

- Common symptoms include issues with shifting gears, transmission not engaging properly, warning lights on the dashboard, and reduced vehicle performance.

2. What does the U1420 code "Implausible Electronic Gear Select Signal Received" mean in a Dodge?

- This code indicates that the transmission control module has detected an implausible electronic gear select signal, which can affect the proper operation of the transmission.

3. What are potential causes of the U1420 code in a Dodge?

- Possible causes include faulty gear selector switch, damaged wiring or connectors, issues with the transmission control module, or a malfunction in the transmission itself.

4. How can I diagnose the U1420 code in my Dodge?

- Diagnosing the U1420 code typically involves using a diagnostic scanner to retrieve the code, checking the gear selector switch, inspecting the wiring and connectors for damage, and testing the transmission control module.

5. Can I continue driving my Dodge with the U1420 code present?

- It is not recommended to continue driving with the U1420 code present, as it can lead to further transmission issues and potential safety hazards. It is best to address the problem promptly.

6. How can I repair the U1420 code in my Dodge?

- Repairing the U1420 code may involve replacing the gear selector switch, repairing damaged wiring or connectors, resetting the transmission control module, or addressing any underlying transmission issues.

7. Will resetting the fault codes clear the U1420 code in my Dodge?

- Resetting the fault codes may temporarily clear the U1420 code, but if the underlying issue is not addressed, the code is likely to return. It is recommended to diagnose and repair the root cause of the problem.

8. Can a DIY enthusiast fix the U1420 code in a Dodge?

- While some aspects of diagnosing and repairing the U1420 code may be possible for DIY enthusiasts, dealing with transmission-related issues can be complex. It is advisable to seek professional help for proper diagnosis and repair.

9. How much does it cost to fix the U1420 code in a Dodge?

- The cost of fixing the U1420 code can vary depending on the root cause of the issue, parts needed for repair, and labor costs. It is recommended to get a diagnostic inspection to determine the exact cost.

10. Is the U1420 code a common issue in Dodge vehicles?

- The U1420 code "Implausible Electronic Gear Select Signal Received" is not uncommon in Dodge vehicles, especially in models with electronic gear selectors. Regular maintenance and timely repairs can help prevent this issue.