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U1402 Jeep Code - Implausible Engine Temperature Signal Received

Quick Answer

The U1402 code for Jeep vehicles indicates that an implausible engine temperature signal has been received by the Engine Control Module (ECM). Common causes include Faulty engine temperature sensor, Wiring or connection issues in the temperature sensor circuit, Malfunctioning ECM. 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 Faulty engine temperature sensor, Wiring or connection issues in the temperature sensor circuit, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code U1402 Jeep Description

The U1402 code for Jeep vehicles indicates that an implausible engine temperature signal has been received by the Engine Control Module (ECM). This means that the ECM has detected a discrepancy between the expected engine temperature and the actual temperature readings it is receiving. This discrepancy can result in various issues that can affect the vehicle's performance and overall functionality.

OBDII Code U1402 Jeep - Implausible Engine Temperature Signal Received
U1402 Jeep Code - Implausible Engine Temperature Signal Received

Common Causes of U1402 Jeep

  1. Faulty engine temperature sensor.
  2. Wiring or connection issues in the temperature sensor circuit.
  3. Malfunctioning ECM.
  4. Cooling system problems, such as a faulty thermostat or water pump.
  5. Low coolant levels or coolant leaks.

Symptoms of U1402 Jeep

  1. Fluctuating engine temperature gauge readings.
  2. Engine overheating or running hotter than usual.
  3. Engine misfires or rough idling.
  4. Decreased fuel efficiency.
  5. Illumination of the check engine light on the dashboard.

How to Fix U1402 Jeep

  1. Diagnose the issue by using a scan tool to read the U1402 code and identify the specific cause of the implausible engine temperature signal.
  2. Inspect the engine temperature sensor and its wiring for any damage or corrosion. Replace the sensor if necessary.
  3. Check the ECM for any faults or programming issues that could be causing the error code. Reset or reprogram the ECM as needed.
  4. Verify the functionality of the cooling system components, such as the thermostat and water pump, to ensure proper engine temperature regulation.
  5. Clear the U1402 code from the ECM memory after completing the repairs and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix U1402 Jeep

The typical repair costs for addressing an implausible engine temperature signal can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty engine temperature sensor can cost between $50 and $200, while diagnosing and repairing wiring or ECM issues may range from $100 to $500 or more. Cooling system repairs, such as replacing a thermostat or water pump, can add additional costs to the overall repair bill.

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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 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.

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