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 MANUALSJEEP2009PATRIOT LIMITED, EDG, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 ((ALL WHEEL DRIVE (AWD) MODULE - ELECTRICAL DIAGNOSTICS))DTC TROUBLESHOOTINGU0423-IMPLAUSIBLE DATA RECEIVED FROM CLUSTER/CCNDIAGNOSTIC TEST
2009 Jeep Patriot Limited, EDG, Standard
Diagnostic Test
2009 Jeep Patriot Limited, EDG, StandardSECTION Diagnostic Test
WARNING: This page is about a different variant/trim than selected.
- CHECK FOR TIPM CAN BUS DTCS
- With the scan tool, read TIPM DTCs.
Are there any TIPM CAN BUS DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing .
- Perform AWD Control Module VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, All Wheel Drive (AWD) - Standard Procedure .
No
- Go to step 2
- With the scan tool, read TIPM DTCs.
- CHECK IF CLUSTER/CCN DTCS ARE PRESENT
- With the scan tool, read CLUSTER/CCN DTCs.
Are there any CLUSTER/CCN DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to DTC-Based Diagnostics/NODE, Cabin Compartment (CCN) - Diagnosis and Testing
- Perform AWD Control Module VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, All Wheel Drive (AWD) - Standard Procedure .
No
- Using the schematics as a guide, check the AWD Control Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the AWD Control Module in accordance with the Service Information.
- Perform AWD Control Module VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, All Wheel Drive (AWD) - Standard Procedure .
- With the scan tool, read CLUSTER/CCN DTCs.
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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.