Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2009COMMANDER SPORT, 3.7 K, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESPARK ASSIST MODULE (PTS) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU0423-00-IMPLAUSIBLE DATA RECEIVED FROM CLUSTER/CCNDIAGNOSTIC TEST
2009 Jeep Commander Sport, 3.7 K, RWD
Diagnostic Test
2009 Jeep Commander Sport, 3.7 K, RWDSECTION Diagnostic Test
- CHECK FOR ACTIVE DTC
- Turn the ignition on.
- With the scan tool, record and erase Park Assist Module DTCs.
- Wait 30 seconds.
- With the scan tool, read Park Assist Module DTCs.
Is this DTC active?
Yes
- Go to step 2
No
- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- INSTRUMENT CLUSTER IS ACTIVE ON THE CAN C INTERIOR BUS
- With the scan tool, select ECU View.
- Verify that the Instrument Cluster is active on the bus.
Is the Instrument Cluster active on the bus?
Yes
- Go to step 3
No
- Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing and perform the No Response from Cluster/CCN diagnostic procedure.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- DTCS STORED OR ACTIVE IN THE INSTRUMENT CLUSTER
- Check for Ignition Switch DTCs in the Instrument Cluster.
Are any DTCs active or stored in the Instrument Cluster?
Yes
- Refer to DTC-Based Diagnostics/NODE, Cabin Compartment (CCN) - Diagnosis and Testing and perform the appropriate diagnostic procedure.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Go to step 4
- Check for Ignition Switch DTCs in the Instrument Cluster.
- ACTIVE DTCS IN THE FCM
- With the scan tool, select ECU View and select FCM.
- With the scan tool, read active DTCs.
Are any Communication DTCs active in the FCM?
Yes
- Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Diagnosis and Testing and perform the appropriate diagnostic procedure.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Replace and program the Park Assist Module in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.