u1198 module communication failure

U1198: Lost Communication With Telematic Control Module

Description: This code indicates that the vehicle’s control modules have lost communication with the telematic control module.

Definition: The U1198 code is set when there is a loss of communication between the telematic control module and other modules in the vehicle, which could be due to wiring issues, a faulty telematic control module, or network problems.

U1198 Module Communication Failure

P0600 – Serial Communication Link Malfunction: Severe

P0601 – Internal Control Module Memory Check Sum Error: Severe

P0602 – Control Module Programming Error: Severe

P0603 – Internal Control Module Keep Alive Memory (KAM) Error: Severe

Common Causes

Common Causes:

• Faulty module communication circuit
• Loose or corroded wiring connections
• Defective control module
• Software issues in the control module
• Interference from other electronic devices

Common Misdiagnosis

Common Diagnostic Steps

OBD2 Code: U1198 – Module Communication Failure

Description: This code indicates a communication failure between modules in the vehicle’s network.

Common Diagnostic Steps:

1. Check for any other stored trouble codes that might be related to communication issues.
2. Inspect all relevant wiring and connectors for signs of damage, corrosion, or disconnection.
3. Verify that the battery voltage is within the correct range, as low voltage can affect module communication.
4. Use a scan tool to check for proper operation of the affected modules and ensure they are receiving power and ground signals.
5. If applicable, update or reprogram the software of the affected modules to ensure compatibility and resolve potential glitches.
6. Perform a continuity test on the communication lines (CAN bus) to identify any breaks or shorts in the circuit.
7. If no faults are found with wiring or connections, consider replacing the module that is not communicating properly after verifying it is indeed faulty.