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Home >> Jeep >> 2023 >> Wagoneer Carbide, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 27 (5.7L - DTCS U1199 To U1817) >> DTC Troubleshooting >> U120C-Lost Brake Booster Signal >> Diagnostic Test

Diagnostic Test

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  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCS.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. ABS COMMUNICATION RELATED DTCS IN OTHER MODULES 
    1. With the scan tool, read DTCs in the ABS Module.

      Is the ABS Module setting any DTCs against the Brake Booster Pressure Sensor?

      Yes 

      No