Adaptive Cruise Control Module (ACC)

U0401-00-IMPLAUSIBLE DATA RECEIVED FROM PCM

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously monitored with the engine running and the Adaptive Cruise Control (ACC) Module in normal mode.

- Set Condition:
The ACC Module receives an implausible (default/error value or toggle error or parity error are present) message from the Powertrain Control Module (PCM) for 600 millisecond. The ACC module will disable the ACC system and the ACC UNAVAILABLE message will display in the Cabin Compartment Node (CCN). Once the Diagnostic Trouble Code (DTC) goes to stored, the ACC system will return to normal operation. The DTC will be cleared after a 100 consecutive key cycles of the STORED DTC.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. VERIFY DTC IS ACTIVE

NOTE: Diagnose all communication DTCs before continuing.

1. Ignition on, engine not running.
2. With the scan tool, read ACC DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors, pay particulate attention the CAN circuits.
- Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.

2. VERIFY PCM IS ACTIVE ON CAN C BUS
1. With the scan tool, select ECU View.
2. Verify that the PCM active on the bus.

Is the PCM active on the bus?

Yes

- Go To 3

No

- Perform the U0100-LOST COMMUNICATION WITH ECM/PCM diagnostic procedure. U0100

3. CHECK FOR ACTIVE OR STORED DTCs IN PCM
1. With the scan tool, read PCM DTCs.

Are any DTCs active or stored in the PCM?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 4

4. CHECK FOR ACTIVE OR STORED COMMUNICATION DTCs IN BCM
1. With the scan tool, read BCM DTCs.

Are any active or stored PCM Communication DTCs set in the BCM?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection

No

- Replace and program the ACC Module.
- Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test.