Diagnostic Test
CHECK FOR AN ACTIVE DTC
- Turn the ignition on.
- With the scan tool, read DTCs and record on the repair order.
Is the DTC active or pending?
Yes
- Refer to U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE and perform the U0121-Lost Communication with Anti-Lock Brake Module diagnostic procedure.
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the Stored Lost Communication DTCs diagnostic procedure.