Rolling Code Failure

Test 1:

Test 2 - 4:

SYMPTOM
ROLLING CODE FAILURE VIN MISMATCH

WHEN MONITORED
At ignition on after ignition on during any rolling code handshake that occurs with the ECM due to a SKREEM or ECM reset.

SET CONDITION
When a PCM STATUS message with a Valid Key status is not received by the SKREEM within 3.5 seconds of transmitting the last Valid Key Code message to the ECM.

POSSIBLE CAUSES
- verifying ECM VIN
- Replace SKREEM and check DTC'S
- Intermittent wiring harness problem
- ECM