u1186 lost communication with adaptive cruise control module 2

OBD2 Code: U1186

Description: Lost Communication With Adaptive Cruise Control Module 2

Definition: This code indicates that the vehicle’s main computer, also known as the Powertrain Control Module (PCM), has lost communication with the Adaptive Cruise Control Module 2. This can be due to a malfunction in the module itself, wiring issues, or network problems within the vehicle’s onboard communication system.

: Lost communication with adaptive cruise control module 2
Severity: Moderate

Common Causes

Common causes:
– Faulty adaptive cruise control module
– Wiring issues such as loose connections or damaged wires
– Software issues within the module or vehicle’s computer system

Common Misdiagnosis

Lost Communication With Adaptive Cruise Control Module 2
Common Misdiagnosis: Faulty adaptive cruise control module or wiring issues are often misdiagnosed as a problem with the vehicle’s main computer system.

Common Diagnostic Steps

OBD2 Code: U1186
Description: Lost Communication with Adaptive Cruise Control Module 2

• Check for any additional trouble codes that may be present, as they can provide more context or related issues.
• Inspect the wiring and connectors between the Adaptive Cruise Control Module 2 and the vehicle’s main communication network for any signs of damage, corrosion, or loose connections.
• Verify that the Adaptive Cruise Control Module 2 is receiving power and ground. Use a multimeter to check voltage levels at the module’s connector.
• Perform a continuity test on the communication lines (CAN bus) to ensure there are no breaks or shorts in the circuit.
• If equipped, use an OBD-II scanner to attempt re-establishing communication with the module. Check if software updates are available for either the module or vehicle ECU.
• If all physical checks pass, consider replacing the Adaptive Cruise Control Module 2 if it is determined to be faulty after further testing.