u001c refers to a communication issue within the vehicles network specifically indicating a problem with the high speed can communication bus

OBD2 Code: U001C

Description: High Speed CAN Communication Bus (-) Open

Definition: This code indicates that there is an open circuit in the high-speed Controller Area Network (CAN) communication bus, which may lead to issues in data transmission between various control modules in the vehicle.

: High severity

Common Causes

Common causes:
– Faulty high speed CAN communication bus
– Loose or corroded connections in the network
– Short circuit in the high speed CAN communication bus
– Malfunctioning control modules connected to the network

 

Common Misdiagnosis

OBD2 Code: U001C
Description: High-Speed CAN Communication Bus Performance
Common Misdiagnosis: Faulty control module replacement without checking for wiring issues or loose connections.

 

Common Diagnostic Steps

OBD2 Code: U001C
Description: High Speed CAN Communication Bus
Common Diagnostic Steps:

1. Check for any other stored trouble codes that might be related to communication issues.
2. Inspect the CAN bus wiring and connectors for damage, corrosion, or disconnection.
3. Verify the integrity of the ground connections associated with the CAN network.
4. Use a scan tool to check for proper communication between modules on the CAN bus.
5. Perform a continuity test on the CAN high and low circuits to ensure there are no breaks in the wiring.
6. If equipped, use an oscilloscope to analyze the waveform of the CAN signals for irregularities.
7. Consult vehicle-specific repair manuals or technical service bulletins (TSBs) for known issues related to this code.
8. If necessary, replace faulty components such as control modules or damaged wiring harnesses.