7000 - 7999: 7200

7200-LOST COMMUNICATION WITH ECM/PCM

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- BCM is configured correctly
- Set Condition:
Bus messages not received from the ECM/PCM for approximately 500 ms.





Diagnostic Test

1. VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.
Is this DTC active?

Yes

- Go To 2

No

- Refer to the Stored Lost Communication test procedure. Stored Lost Communication DTCs
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read all active DTCs from all modules.

NOTE: Check for BCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

- Diagnose and repair the DTC.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests

No

- Go To 3

3. VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the ECM/PCM is active on the bus.
Is the ECM/PCM active on the bus?

Yes

- Go To 4

No

- Refer to the No Response test procedure.Communications - Verbose Codes
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network Diagnostics.
Is there more than one module with active DTCs "Logged Against" the ECM/PCM?

Yes

- Replace/update the ECM/PCM.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests

No

- Replace/update the module that set this DTC.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests