AutoCodes – RAM – U1401 RAM

U1401 RAM 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 RAM 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 5,492

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

What does this mean?

What are the Possible Causes of the DTC U1401 RAM?

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 RAM?

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 RAM 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 RAM code?

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

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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 U1401 RAM Code

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

The common symptoms include engine misfire, rough idling, stalling, loss of power, and illuminated check engine light.

2. What can cause the OBDII code U1401 RAM to trigger?

The code U1401 RAM can be triggered by issues such as a faulty crankshaft position sensor, damaged wiring or connectors, or ECM (engine control module) failure.

3. How can I diagnose the OBDII code U1401 RAM?

Diagnosing the code U1401 RAM typically involves checking the crankshaft position sensor's signal, inspecting the wiring harness for damages, and testing the ECM for proper functioning.

4. What repair tips can help resolve the OBDII code U1401 RAM?

Repair tips for resolving the code U1401 RAM may include replacing the faulty crankshaft position sensor, repairing or replacing damaged wiring, and reprogramming or replacing the ECM if necessary.

5. Can driving with the OBDII code U1401 RAM pose any risks?

Continuing to drive with the code U1401 RAM may lead to further engine damage, reduced fuel efficiency, and potential safety hazards due to erratic engine behavior.

6. How urgent is it to address the OBDII code U1401 RAM?

It is recommended to address the code U1401 RAM promptly to prevent potential engine performance issues and ensure the safe operation of the vehicle.

7. Are there any recalls related to the OBDII code U1401 RAM?

Recalls related to the code U1401 RAM may vary by vehicle make and model, so it is advisable to check with the manufacturer or a certified dealer for any relevant information.

8. Can a DIY enthusiast repair the OBDII code U1401 RAM?

While some DIY enthusiasts may have the skills to address the code U1401 RAM, professional diagnosis and repair by a qualified mechanic are often recommended for accurate and efficient resolution.

9. How much can it cost to repair the OBDII code U1401 RAM?

The cost of repairing the code U1401 RAM can vary depending on the specific cause, parts needed, labor rates, and the vehicle's make and model. It is advisable to obtain quotes from reputable repair shops.

10. How can I prevent the OBDII code U1401 RAM from recurring?

Regular maintenance, such as inspecting and replacing sensors and wiring as needed, following the manufacturer's service schedule, and driving responsibly, can help prevent the recurrence of the code U1401 RAM.