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U1402 Chrysler Code - Implausible Engine Temperature Signal Received

Quick Answer

The U1402 Chrysler code indicates that the Engine Control Module (ECM) has detected an implausible engine temperature signal. Common causes include Faulty engine temperature sensor, Wiring or connection issues between the sensor and ECM, Corroded or damaged sensor connectors. 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 Chrysler indicates Implausible Engine Temperature Signal Received.
Common causes
Common causes include Faulty engine temperature sensor, Wiring or connection issues between the sensor and ECM, Corroded or damaged sensor connectors.
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 Chrysler Description

The U1402 Chrysler code indicates that the Engine Control Module (ECM) has detected an implausible engine temperature signal. This means that the ECM has received a signal from the engine temperature sensor that does not match the expected values. The engine temperature sensor is responsible for monitoring the temperature of the engine coolant and transmitting this information to the ECM. When the ECM receives an implausible signal, it can affect the vehicle's performance and potentially lead to engine overheating or other issues.

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

Common Causes of U1402 Chrysler

  1. Faulty engine temperature sensor.
  2. Wiring or connection issues between the sensor and ECM.
  3. Corroded or damaged sensor connectors.
  4. ECM software or hardware malfunction.
  5. Coolant leakage affecting sensor readings.

Symptoms of U1402 Chrysler

  1. Check engine light is illuminated on the dashboard.
  2. Fluctuating or inaccurate temperature gauge readings.
  3. Engine overheating or running hotter than usual.
  4. Poor fuel efficiency.
  5. Engine misfires or stalling.

How to Fix U1402 Chrysler

  1. Begin by diagnosing the issue using a scan tool to read the fault codes and monitor live engine data.
  2. Inspect the engine temperature sensor and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance and voltage output to determine if it is functioning correctly.
  4. Replace the engine temperature sensor if it is found to be faulty.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix U1402 Chrysler

The typical repair costs for addressing an implausible engine temperature signal can range from $100 to $300, depending on the specific cause of the issue and the cost of parts. This estimate includes the cost of a new engine temperature sensor and any labor charges for diagnosis and installation. It is important to note that actual repair costs may vary based on factors such as the vehicle's make and model, location, and the rates charged by the auto repair shop. It is recommended to obtain a detailed quote from a trusted mechanic before proceeding with the repair.

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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 Chrysler Code

1. What are the common symptoms of an U1402 Chrysler trouble code?

- Common symptoms include erratic engine temperature readings on the dashboard, overheating warning lights, and potential engine performance issues.

2. What could cause the U1402 code to trigger in a Chrysler vehicle?

- The U1402 code typically triggers when the Engine Control Module (ECM) receives an implausible signal related to engine temperature from the sensors.

3. How serious is the U1402 code in a Chrysler vehicle?

- The U1402 code should be addressed promptly to prevent potential engine overheating and damage due to inaccurate temperature readings.

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

- Yes, a malfunctioning engine coolant temperature sensor is a common cause of the U1402 code as it can send incorrect signals to the ECM.

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

- DIY repair tips include checking and potentially replacing the engine coolant temperature sensor, ensuring proper wiring connections, and resetting the code after the repair.

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

- It is not recommended to drive with the U1402 code as it can lead to inaccurate engine temperature readings and potential overheating issues.

7. How can a mechanic diagnose the U1402 code in a Chrysler vehicle?

- A mechanic can use a diagnostic scanner to read the code, inspect the engine coolant temperature sensor, check the wiring for any faults, and perform a thorough system test.

8. Can extreme weather conditions trigger the U1402 code in a Chrysler car?

- Yes, extreme weather conditions such as very high or very low temperatures can sometimes cause erratic readings and trigger the U1402 code.

9. Are there any recalls related to the U1402 code in Chrysler vehicles?

- It is advisable to check with the manufacturer or authorized service centers for any recalls or known issues related to the U1402 code in Chrysler vehicles.

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

- The cost of repairing the U1402 code can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, or ECM reprogramming, with costs ranging from $100 to $500 or more.

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