7000 - 7999: 7200

7200-LOST COMMUNICATION WITH ECM

For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

- 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 for approximately 500 ms.





1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1. 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 the BODY VERIFICATION TEST Verification Tests.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. 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

- Perform the appropriate diagnostic procedure.Testing and Inspection
- Perform the BODY VERIFICATION TEST Verification Tests.

No

- Go To 3

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

Is the ECM active on the bus?

Yes

- Go To 4

No

- For No Response from ECM diagnostic procedures. Communications - Verbose Codes
- Perform the BODY VERIFICATION TEST Verification Tests.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs "Logged Against" the ECM?

Yes

- Replace/update the ECM.
- Perform the ECM VERIFICATION TEST Verification Tests.

No

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