U1402 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 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.
Code U1402 Description
What are the Possible Causes of the DTC U1402?
- 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?
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 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 code?
Need more information on how to fix the U1402 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U1402 code diagnosed by a professional: Find a repair shop in your area
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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