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U1402 Dodge Code - Implausible Engine Temperature Signal Received

Quick Answer

The U1402 code for Dodge vehicles indicates that an implausible engine temperature signal has been received by the Engine Control Module (ECM). Common causes include Faulty Engine Coolant Temperature Sensor: A malfunctioning temperature sensor can send incorrect readings to the ECM, Wiring Issues: Damaged or corroded wiring in the temperature sensor circuit can disrupt the signal transmission, ECM Malfunction: A faulty ECM can misinterpret temperature data and trigger the U1402 code. 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 Dodge indicates Implausible Engine Temperature Signal Received.
Common causes
Common causes include Faulty Engine Coolant Temperature Sensor: A malfunctioning temperature sensor can send incorrect readings to the ECM, Wiring Issues: Damaged or corroded wiring in the temperature sensor circuit can disrupt the signal transmission, ECM Malfunction: A faulty ECM can misinterpret temperature data and trigger the U1402 code.
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 07, 2024
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Code U1402 Dodge Description

The U1402 code for Dodge vehicles indicates that an implausible engine temperature signal has been received by the Engine Control Module (ECM). This means that the ECM is detecting a discrepancy between the actual engine temperature and the expected or programmed temperature. The engine temperature is a critical parameter for the proper functioning of the engine and its components. When the ECM receives an incorrect or implausible signal, it can lead to various issues that affect the vehicle's performance, emissions, and overall functionality.

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

Common Causes of U1402 Dodge

  1. Faulty Engine Coolant Temperature Sensor: A malfunctioning temperature sensor can send incorrect readings to the ECM.
  2. Wiring Issues: Damaged or corroded wiring in the temperature sensor circuit can disrupt the signal transmission.
  3. ECM Malfunction: A faulty ECM can misinterpret temperature data and trigger the U1402 code.
  4. Software Glitch: An issue in the ECM's programming can cause it to receive implausible temperature signals.

Symptoms of U1402 Dodge

  1. Check Engine Light: The most common symptom associated with the U1402 code is the illumination of the Check Engine Light on the dashboard.
  2. Inaccurate Temperature Gauge: The temperature gauge on the instrument cluster may show incorrect readings or fluctuate erratically.
  3. Engine Performance Issues: The vehicle may experience poor acceleration, rough idling, or stalling due to incorrect temperature readings affecting fuel delivery and ignition timing.
  4. Overheating: In severe cases, the engine may overheat due to incorrect temperature signals, leading to potential damage to engine components.
  5. Reduced Fuel Efficiency: Incorrect temperature readings can result in poor fuel efficiency as the engine may not operate optimally.

How to Fix U1402 Dodge

  1. Diagnostic Testing: Use a scan tool to retrieve the trouble code and perform diagnostic tests to pinpoint the root cause of the issue.
  2. Inspect Temperature Sensor: Check the engine coolant temperature sensor for proper operation and replace it if faulty.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as needed.
  4. ECM Inspection: Verify the ECM's functionality and reprogram or replace it if necessary.
  5. Clear Codes: After repairs are completed, clear the trouble code and test drive the vehicle to ensure the issue is resolved.

Cost to Fix U1402 Dodge

The typical repair costs for addressing the U1402 code can vary depending on the specific cause of the issue. In general, replacing a faulty engine coolant temperature sensor can cost between $50 and $150, while diagnosing and repairing wiring issues or ECM malfunctions may range from $100 to $500 or more. Labor costs at auto repair shops usually range from $80 to $150 per hour, with additional charges for parts and diagnostic time. It's advisable to consult with a professional mechanic to get an accurate estimate based on the vehicle's make and model, as well as the extent of the repairs needed.

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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 Dodge Code

1. What are the common symptoms of U1402 OBDII code in a Dodge vehicle?

- Common symptoms include erratic engine temperature readings on the gauge, overheating warnings, and potential engine performance issues.

2. What are the possible causes of the U1402 code in a Dodge vehicle?

- The U1402 code typically indicates a fault with the Engine Control Module (ECM), faulty engine temperature sensor, wiring issues, or a malfunction in the cooling system.

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

- Diagnosing the U1402 code involves checking the engine temperature sensor, inspecting the wiring for any damage, and testing the ECM for proper functionality using a diagnostic scanner.

4. Can a faulty engine temperature sensor cause the U1402 code in a Dodge?

- Yes, a faulty engine temperature sensor can trigger the U1402 code by sending implausible temperature readings to the ECM.

5. What are some repair tips for fixing the U1402 code in a Dodge vehicle?

- Repair tips include replacing the engine temperature sensor, repairing any damaged wiring, resetting the ECM, and ensuring the cooling system is functioning properly.

6. Is it safe to continue driving with the U1402 code present in a Dodge vehicle?

- It is not recommended to drive with the U1402 code present as it can lead to engine overheating and potential damage if the actual engine temperature is not accurately monitored.

7. How much does it typically cost to repair the U1402 code in a Dodge vehicle?

- The cost of repairing the U1402 code can vary depending on the underlying cause, but it may range from $100 to $300 for parts and labor.

8. Can a DIY enthusiast fix the U1402 code issue in a Dodge vehicle?

- Depending on the level of expertise, a DIY enthusiast may be able to address the U1402 code by following repair guides and using the necessary tools for sensor replacement or wiring repairs.

9. Will resetting the ECM clear the U1402 code in a Dodge vehicle?

- Resetting the ECM may temporarily clear the U1402 code, but if the underlying issue persists, the code is likely to reappear after driving the vehicle.

10. How long does it take to repair the U1402 code in a Dodge vehicle?

- The repair time for the U1402 code can vary based on the diagnostic process and the specific repair needed, but it typically takes a few hours to a day to address the issue completely.

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