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Home >> Jeep >> 2021 >> Grand Cherokee L Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (5.7L - DTCS U0155 To U1494) >> DTC Troubleshooting >> U12A8-Lost Communication With Master Cylinder Pressure Sensor >> 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 and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE ABS MODULE FOR DTCS 
    1. With the scan tool, read DTCs in the ABS Module.

      Are there any DTCs in the ABS Module?

      Yes 

      No