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 MANUALSJEEP2023CHEROKEE TRAILHAWKREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOLLISION/AVOIDANCEPARK ASSIST MODULE (PAM) - DTCS B12B2-2A TO B1297-12DTC TROUBLESHOOTINGB128E-25-PTS-SENSOR -1-SIGNAL SHAPE / WAVEFORM FAILUREDIAGNOSTIC TEST

2023 Jeep Cherokee Trailhawk

Diagnostic Test

2023 Jeep Cherokee TrailhawkSECTION Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. Verify the Park Assist Sensor is not damaged and properly connected before proceeding with this diagnostic procedure.
2. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
3. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
4. With the scan tool, erase all DTCs.
5. Turn the ignition off for a minimum of 10.0 seconds.
6. Turn the ignition on.
7. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
8. With the scan tool, read PAM DTCs.
  Did the DTC return?
  
  Yes
  - Refer to 2.
  No
  - Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
INSPECT SENSOR
1. Inspect exterior of bumper for snow, ice or dirt covering sensor.
2. Inspect sensor connections for snow, ice or dirt.
3. Inspect for a missing or improperly mounted decoupling ring.
4. Inspect for correct installation.
  Were any of the conditions found?
  
  Yes
  - Go To 3
  No
  - Go To 4
CLEAN OR REPAIR AND RETEST FOR DTCS
1. Turn the ignition off.
2. Clean or repair park assist sensor.
3. Turn the ignition on.
4. With the scan tool, erase all DTCs.
5. Turn the ignition off for a minimum of 10.0 seconds.
6. Turn the ignition on.
7. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
8. With the scan tool, read PAM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Cleaning or repairing the park assist sensor eliminated the fault.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CLEAN AND RETEST FOR DTCS
1. Turn the ignition off.
2. Remove park assist sensor.
3. Clean park assist sensor.
4. Reinstall the park assist sensor.
5. Turn the ignition on.
6. With the scan tool, erase all DTCs.
7. Turn the ignition off for a minimum of 10.0 seconds.
8. Turn the ignition on.
9. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read PAM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 5
  No
  - Cleaning park assist sensor eliminated the fault.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all ECUs and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read PAM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Park Assist Sensor in accordance with the Service Information. Refer to SENSOR, PARK ASSIST, REMOVAL and SENSOR, PARK ASSIST, INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Cleaning park assist sensor eliminated the fault.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

RENDER: 1.0x

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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.