No Communication With ECM (Active)

Test 1 - Test 3:

Test 4 - Test 6:

SYMPTOM
NO COMMUNICATION WITH ECM (ACTIVE)

WHEN MONITORED
With the ignition on.

SET CONDITION
This DTC will set if the Automatic Temperature Control (ATC) fails to receive all messages from the ECM.

POSSIBLE CAUSES
- Can c bus circuit(S) shorted or open
- Engine control module DTC(S) present
- Engine control module's power/ground circuit(s) shorted or open
- Engine control module
- CAN C BUS (+)/CAN C BUS (-) circuit(S) open to engine control module
- Automatic temperature control (ATC)
- CAN C BUS (+)/CAN C BUS (-) CIRCUIT(S) open to automatic temperature control