U1402 Code - Implausible Engine Temperature Signal Received
Quick Answer
The U1402 code indicates that the Engine Control Module (ECM) has detected an implausible signal related to the engine temperature. Common causes include Faulty engine coolant temperature sensor, Wiring or connector issues in the temperature sensor circuit, ECM software malfunction. 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 indicates Implausible Engine Temperature Signal Received.
- Common causes
- Common causes include Faulty engine coolant temperature sensor, Wiring or connector issues in the temperature sensor circuit, ECM software malfunction.
- 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 U1402 Description
The U1402 code indicates that the Engine Control Module (ECM) has detected an implausible signal related to the engine temperature. This means that the temperature reading being received by the ECM is not within the expected range, causing confusion in the system. The engine temperature is a crucial parameter for the ECM to adjust fuel mixture, ignition timing, and other engine functions for optimal performance and efficiency. An incorrect temperature reading can lead to poor engine performance, decreased fuel efficiency, and potential damage to the engine if not addressed promptly.
Common Causes of U1402
- Faulty engine coolant temperature sensor.
- Wiring or connector issues in the temperature sensor circuit.
- ECM software malfunction.
- Cooling system problems such as low coolant level or a malfunctioning thermostat.
- Electrical issues such as a short circuit or voltage spike affecting the temperature signal.
Symptoms of U1402
- Check engine light is illuminated on the dashboard.
- Engine running hotter or colder than normal.
- Reduction in fuel efficiency.
- Engine performance issues such as rough idling or stalling.
How to Fix U1402
- Begin by using a diagnostic scanner to retrieve the trouble codes and verify the U1402 code related to the engine temperature signal.
- Inspect the engine coolant temperature sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
- Check the coolant level in the system and ensure there are no leaks. Top up or repair as needed.
- Test the thermostat to ensure it is functioning correctly and replace if faulty.
- Clear the trouble codes from the ECM memory and perform a test drive to verify that the issue has been resolved.
Cost to Fix U1402
The cost of repairing an implausible engine temperature signal can vary depending on the specific cause of the issue. On average, you can expect to pay anywhere from $100 to $300 for parts and labor. Keep in mind that labor rates at auto repair shops can range from $80 to $150 per hour, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle model. Additionally, the cost of any necessary parts will also impact the total repair bill.
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Code U1402 Information for Specific Makes
- U1402 Chrysler — Implausible Engine Temperature Signal Received
- U1402 Dodge — Implausible Engine Temperature Signal Received
- U1402 Jeep — Implausible Engine Temperature Signal Received
- U1402 RAM — Implausible Engine Temperature Signal Received
Frequently Asked Questions about U1402 Code
1. What are the common symptoms of an OBDII code U1402 (Implausible Engine Temperature Signal Received)?
- Common symptoms include erratic engine temperature gauge readings, engine overheating or running too cold, and potential issues with the vehicle's cooling system.
2. What are the possible causes of an U1402 code?
- Possible causes include a faulty engine coolant temperature (ECT) sensor, wiring issues in the ECT circuit, a malfunctioning engine control module (ECM), or a software glitch in the vehicle's computer system.
3. How can I diagnose the U1402 code related to an implausible engine temperature signal?
- To diagnose the issue, you can use an OBDII scanner to read the code, check the ECT sensor's resistance with a multimeter, inspect the wiring for damage, and perform a thorough visual inspection of the cooling system components.
4. Is it safe to continue driving with an U1402 code indicating an implausible engine temperature signal?
- It is not recommended to continue driving with this code present, as it can lead to potential engine damage or overheating issues. It is best to address the problem promptly.
5. How can I repair an U1402 code related to an implausible engine temperature signal?
- Repair options include replacing the faulty ECT sensor, repairing any damaged wiring, resetting the ECM, or updating the vehicle's software to address any glitches causing the code.
6. Can a DIY enthusiast fix an U1402 code at home?
- Depending on your skill level and access to tools, DIY enthusiasts may be able to address an U1402 code by replacing the ECT sensor or repairing wiring issues. However, more complex diagnostics may require professional help.
7. Are there any preventive measures to avoid getting an U1402 code?
- Regular maintenance of the cooling system, checking the ECT sensor for signs of wear, and addressing any engine temperature-related issues promptly can help prevent the occurrence of an U1402 code.
8. How long does it typically take to repair an U1402 code?
- The repair time for an U1402 code can vary depending on the exact cause of the issue. Simple fixes like replacing an ECT sensor may take less than an hour, while more complex diagnostics and repairs can take longer.
9. Will an U1402 code clear itself over time?
- In some cases, if the issue causing the U1402 code is intermittent or temporary, the code may clear itself after several drive cycles. However, it is still recommended to diagnose and address the underlying problem.
10. Can an U1402 code be a false alarm?
- While rare, false alarms for an U1402 code can occur due to temporary sensor malfunctions or software glitches. It is advisable to confirm the issue through proper diagnosis before dismissing the code as a false alarm.
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