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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 267 (DTCS P3442 To U1418, Checking For No Crank, No Response & Intermittent DTC) >> U0121-Lost Communication With Anti-Lock Brake Module >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

    Turn the ignition on.

    With a scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS article for diagnostic procedures and for further possible causes.

    No 

    1. Refer to the *CHECKING FOR AN INTERMITTENT DTC  Diagnostic Procedure.
    2. Perform *PCM VERIFICATION TEST .
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