u1186 lost communication with adaptive cruise control module
OBD2 Code: U1186
Description: Lost Communication With Adaptive Cruise Control Module
Definition: This code indicates that the vehicle’s main computer (PCM) has not received a signal from the Adaptive Cruise Control (ACC) module. The ACC system is responsible for maintaining a set speed and distance from vehicles ahead, and this code suggests there is a communication issue between the PCM and the ACC module.
Common Causes
U1186 – Lost Communication with Adaptive Cruise Control Module
Common Causes:
- Faulty adaptive cruise control module
- Wiring issues such as damaged wires or poor connections
- Interference from other electronic devices
- Software issues within the vehicle’s network system
Common Misdiagnosis
OBD2 Code: U1186
Description: Lost Communication with Adaptive Cruise Control Module
Common Misdiagnosis: Faulty adaptive cruise control module is often misdiagnosed, while the issue may actually be due to wiring problems or a faulty communication network.
Common Diagnostic Steps
- Verify the code is active by checking if it returns after clearing.
- Inspect and ensure all related fuses are intact and not blown.
- Check for any other communication-related codes that might indicate a broader network issue.
- Examine the wiring harnesses and connectors between the adaptive cruise control module and the vehicle’s main communication bus for damage or corrosion.
- Test the voltage supply to the adaptive cruise control module to ensure it is receiving power.
- Use a scan tool to check for updates or reprogramming needs for the adaptive cruise control module software.
- If possible, perform a continuity test on the CAN bus lines connected to the module.
- Consult technical service bulletins (TSBs) for known issues related to this code on your specific vehicle model.