U0116 Code - Lost Communication With Coolant Temperature Control Module
Quick Answer
The diagnostic trouble code U0116 indicates that the vehicle's engine control module (ECM) has lost communication with the coolant temperature control module. Common causes include Faulty coolant temperature control module, Loose or corroded electrical connections between the ECM and coolant temperature control module, Wiring harness issues. 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
- U0116 indicates Lost Communication With Coolant Temperature Control Module.
- Common causes
- Common causes include Faulty coolant temperature control module, Loose or corroded electrical connections between the ECM and coolant temperature control module, Wiring harness issues.
- 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 U0116 Description
The diagnostic trouble code U0116 indicates that the vehicle's engine control module (ECM) has lost communication with the coolant temperature control module. The coolant temperature control module is responsible for monitoring and regulating the engine's coolant temperature to ensure optimal performance. When communication is lost between the ECM and the coolant temperature control module, it can lead to various issues with the vehicle's cooling system and overall performance.
Common Causes of U0116
- Faulty coolant temperature control module
- Loose or corroded electrical connections between the ECM and coolant temperature control module
- Wiring harness issues
- ECM software or hardware malfunction
- Water damage or corrosion in the control module
Symptoms of U0116
- Check engine light illuminated on the dashboard
- Engine overheating or running hotter than normal
- Inaccurate temperature readings on the coolant temperature gauge
- Engine running rough or misfiring
- Difficulty starting the engine
How to Fix U0116
- Begin by conducting a visual inspection of the wiring harness and electrical connections between the ECM and the coolant temperature control module. Look for any signs of damage, corrosion, or loose connections. Repair or replace any damaged parts as necessary.
- Test the coolant temperature control module using a diagnostic scan tool to check for proper functionality. If the module is found to be faulty, replace it with a new one.
- Clear the diagnostic trouble code from the ECM using a scan tool and perform a test drive to ensure that the communication between the modules has been restored.
- If the issue persists, perform a thorough inspection of the ECM and associated components to identify any underlying issues. Replace or repair any faulty components to restore proper communication.
- Once the repair has been completed, recheck the system for any remaining fault codes and ensure that the vehicle is operating correctly.
Cost to Fix U0116
The cost of repairing a lost communication issue with the coolant temperature control module can vary depending on the specific cause of the problem and the make and model of the vehicle. In general, the cost of parts for this repair can range from $100 to $500, while the labor costs can range from $100 to $300. Overall, the total cost of the repair is typically in the range of $200 to $800. Keep in mind that these estimates are general guidelines and actual costs may vary based on the factors mentioned earlier. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate.
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