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 MANUALSJEEP2010GRAND CHEROKEE LAREDO, 5.7 T, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICES(PARK ASSIST MODULE (PTS) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGB128F-25-PTS SENSOR 2-SIGNAL SHAPE / WAVEFORM FAILUREDIAGNOSTIC TEST
2010 Jeep Grand Cherokee Laredo, 5.7 T, 4WD
Diagnostic Test
2010 Jeep Grand Cherokee Laredo, 5.7 T, 4WDSECTION Diagnostic Test
- CHECK FOR ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, remove any ice, snow, mud, dirt, or other obstructions from the front/rear fascia.
- Turn the ignition on.
- 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 .
- PARK ASSIST SENSOR
- Verify that none of the possible causes mentioned above are present. Repair as necessary.
If possible none of the causes mentioned above are present, view repair.
Repair
- Replace the Park Assist Sensor in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- Verify that none of the possible causes mentioned above are present. Repair as necessary.
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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.