AutoCodes – Jeep – U1402 Jeep

U1402 Jeep 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 Jeep 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 11,614

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 Jeep Description

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

What does this mean?

What are the Possible Causes of the DTC U1402 Jeep?

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 Jeep?

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 Jeep 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 Jeep code?

Need more information on how to fix the U1402 Jeep code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1402 Jeep code diagnosed by a professional: Find a repair shop in your area

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 Jeep Code

1. What are the common symptoms of OBDII code U1402 in a Jeep related to an implausible engine temperature signal?

- Common symptoms include inaccurate temperature readings on the dashboard, overheating or misfiring of the engine, and potential issues with the vehicle's cooling system.

2. What are some possible causes of the U1402 code in a Jeep?

- Possible causes include a faulty engine coolant temperature sensor, wiring or connection issues in the temperature sensor circuit, or a malfunction in the Powertrain Control Module (PCM).

3. How can I diagnose the U1402 code in my Jeep?

- To diagnose the issue, check the engine coolant temperature sensor for proper functionality, inspect the wiring and connectors for any damage or loose connections, and perform a scan with an OBDII scanner to gather more specific data.

4. Can I drive my Jeep with the U1402 code present?

- It is not recommended to drive the vehicle with the U1402 code active, as it can lead to potential engine overheating or other serious issues. It's best to address the problem promptly.

5. How can I repair the U1402 code in my Jeep?

- Repair options may include replacing the engine coolant temperature sensor, repairing any damaged wiring or connections, or reprogramming the PCM to address the implausible temperature signal issue.

6. Will resetting the fault codes make the U1402 code disappear permanently?

- Resetting the fault codes may temporarily clear the code, but if the underlying issue causing the implausible temperature signal is not addressed, the code is likely to reappear.

7. Are there any tips for preventing the U1402 code from reoccurring in my Jeep?

- Regular maintenance of the cooling system, checking the engine coolant level, and promptly addressing any overheating issues can help prevent the U1402 code from reoccurring.

8. Can a DIY enthusiast with basic automotive skills fix the U1402 code in a Jeep?

- Depending on the root cause of the code, a DIY enthusiast with basic skills may be able to address the issue by replacing the engine coolant temperature sensor or checking and repairing wiring connections.

9. How much does it typically cost to repair the U1402 code in a Jeep at a dealership or repair shop?

- The cost of repairing the U1402 code can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor at a dealership or repair shop.

10. Is the U1402 code exclusive to Jeep vehicles, or can it occur in other car makes and models?

- While the U1402 code is specific to Jeep vehicles, similar codes related to implausible engine temperature signals may exist in other car makes and models, each with their unique diagnostic procedures.