AutoCodes – RAM – U1402 RAM

U1402 RAM Code - Implausible Engine Temperature Signal Received

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Transmission Control Module (TCM) receives a Signal Not Available (SNA) message from the Powertrain Control Module (PCM) or an incorrect Controller Area Network (CAN) message from the PCM. Common causes include Check for Powertrain Control Module (PCM) codes, Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) 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: U1402 RAM indicates Implausible Engine Temperature Signal Received.
Common causes: Common causes include Check for Powertrain Control Module (PCM) codes, Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) 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 673

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U1402 RAM Description

OBDII Code U1402 RAM - Implausible Engine Temperature Signal Received - AutoCodes.com — U1402 RAM Code - Implausible Engine Temperature Signal Received

What does this mean?

What are the Possible Causes of the DTC U1402 RAM?

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

How to Fix the DTC U1402 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 U1402 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 U1402 RAM code?

Need more information on how to fix the U1402 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 U1402 RAM Code

1. What are the common symptoms of OBDII code U1402 RAM titled Implausible Engine Temperature Signal Received?

The common symptoms include inaccurate temperature readings on the dashboard, engine overheating or cooling issues, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code U1402 RAM?

The code U1402 RAM may be triggered by a faulty engine temperature sensor, wiring issues related to the sensor, a malfunctioning PCM (Powertrain Control Module), or a software glitch.

3. How can I diagnose the cause of OBDII code U1402 RAM?

Diagnosing the issue involves using an OBDII scanner to read the code, checking the engine temperature sensor for proper operation, inspecting the sensor wiring for damages, and testing the PCM for faults.

4. Can driving with OBDII code U1402 RAM cause further damage to the vehicle?

Continuing to drive with this code may lead to engine damage due to potential overheating or cooling system malfunctions. It is recommended to address the issue promptly to prevent further damage.

5. How can I repair OBDII code U1402 RAM?

Repairing the code may involve replacing the faulty engine temperature sensor, repairing damaged wiring, or reprogramming the PCM to resolve any software issues causing the fault code.

6. Is it safe to drive my vehicle with OBDII code U1402 RAM if the engine temperature appears normal?

While the engine temperature may appear normal, it is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the engine temperature signal, which could cause unexpected problems.

7. Can a DIY enthusiast fix OBDII code U1402 RAM at home?

Depending on the cause of the code, some DIY enthusiasts may be able to address the issue at home by replacing the engine temperature sensor or repairing wiring. However, proper diagnosis and repair are essential to ensure the problem is fixed correctly.

8. How much does it typically cost to repair OBDII code U1402 RAM at a repair shop?

The cost of repair can vary depending on the underlying cause of the code, the labor rates of the repair shop, and the cost of any necessary parts. It is recommended to obtain quotes from multiple shops for an accurate estimate.

9. Will resetting the check engine light turn off OBDII code U1402 RAM?

Resetting the check engine light without addressing the underlying issue will not resolve OBDII code U1402 RAM. The code is likely to reappear until the root cause of the problem is fixed.

10. How urgent is it to address OBDII code U1402 RAM?

It is recommended to address OBDII code U1402 RAM promptly to prevent potential engine damage and ensure the vehicle operates correctly. Ignoring the issue may lead to more severe problems in the future.