AutoCodes – Generic – U1401

U1401 Code - Implausible Engine Speed Signal Received

Quick Answer

The purpose of the diagnostic is to monitor the Controller Area Network (CAN) BUS, the transmitted messages on the CAN BUS and the validity of the CAN signals. Common causes include Check for Powertrain Control Module (PCM) codes, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted. 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: U1401 indicates Implausible Engine Speed Signal Received.
Common causes: Common causes include Check for Powertrain Control Module (PCM) codes, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted.
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 9,025

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 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1401 Description

The purpose of the diagnostic is to monitor the Controller Area Network (CAN) BUS, the transmitted messages on the CAN BUS and the validity of the CAN signals. Several control units are connected to the CAN BUS which send their messages cyclically in a defined time window. The messages contain multiple signals representing vehicle information. The Diagnostic Trouble Code (DTC) sets when the Transmission Control Module (TCM) detects an incorrect CAN ID from the Powertrain Control Module (PCM).

OBDII Code U1401 - Implausible Engine Speed Signal Received - AutoCodes.com — U1401 Code - Implausible Engine Speed Signal Received

What does this mean?

What are the Possible Causes of the DTC U1401?

Check for Powertrain Control Module (PCM) codes
Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U1401?

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 U1401 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.

Need more information about the U1401 code?

Need more information on how to fix the U1401 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1401 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1401 Chrysler — Implausible Engine Speed Signal Received
U1401 Dodge — Implausible Engine Speed Signal Received
U1401 Jeep — Implausible Engine Speed Signal Received
U1401 RAM — Implausible Engine Speed 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 U1401 Code

1. What are the common symptoms of OBDII code U1401 (Implausible Engine Speed Signal Received)?

- Common symptoms include erratic engine performance, stalling, rough idling, and issues with vehicle acceleration.

2. What are the possible causes of OBDII code U1401?

- Possible causes include a faulty engine speed sensor, wiring issues, poor connections, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code U1401?

- The diagnosis typically involves using a diagnostic scan tool to retrieve the code, checking the engine speed sensor for proper operation, inspecting wiring for damage, and testing the ECM for faults.

4. Can driving with OBDII code U1401 cause further damage to my vehicle?

- It is not recommended to drive with this code as it can lead to further engine issues and potential safety hazards. It is advisable to address the problem promptly.

5. How can I repair OBDII code U1401?

- Repair methods may include replacing the faulty engine speed sensor, repairing damaged wiring or connections, and reprogramming or replacing the ECM if necessary.

6. Is it safe to continue driving my vehicle if I clear the OBDII code U1401 without fixing the issue?

- Clearing the code without addressing the underlying problem may temporarily resolve the symptoms, but the issue will likely resurface, so it is not safe to continue driving without a proper repair.

7. Can a DIY enthusiast fix OBDII code U1401, or is professional help required?

- Depending on your experience and tools available, some individuals may be able to diagnose and repair this code themselves. However, complex issues or electrical work may require professional assistance.

8. Will resetting the ECM clear OBDII code U1401?

- Resetting the ECM may temporarily clear the code, but if the underlying issue persists, the code is likely to return. It is essential to diagnose and fix the root cause of the problem.

9. How long does it typically take to repair OBDII code U1401?

- The repair time can vary based on the specific cause of the code, availability of parts, and the expertise of the person performing the repair. It can range from a few hours to a day in some cases.

10. Can OBDII code U1401 be prevented in the future?

- Regular vehicle maintenance, including checking and replacing sensors as needed, inspecting wiring for damage, and addressing any ECM issues promptly, can help prevent this code from occurring.