Diagnostic Test

WARNING: This page is about a different car, the 2008 Jeep Commander. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE STATUS OF THE ERROR MESSAGE
NOTE: Ensure the vehicle being tested is a CAN BUS VEHICLE. If not, false error messages may be displayed.

NOTE: Ensure the scan tool is updated to the latest software.

With the scan tool, record the error message.

Disconnect the scan tool from the DLC.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

Does the scan tool display this same error message?

Yes
1. Go To step 2.
No
1. The conditions that caused this error message to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
(D72) DIAGNOSTIC CAN C (+) CIRCUIT SHORTED TO GROUND

Fig 1: Measuring Resistance Between Ground And (D72) Diagnostic CAN C (+) Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Front Control Module C1 harness connector.

Disconnect the scan tool from the DLC.

Measure the resistance between ground and the (D72) Diagnostic CAN C (+) circuit.

Is the resistance below 100.0 ohms?

Yes
1. Repair the (D72) Diagnostic CAN C (+) circuit for a short to ground.
2. Perform BODY VERIFICATION TEST .
No
1. Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Front Control Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST .