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DTC P1A1B: Brake System Control Module - Forced Engine Running

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P1A1B - BRAKE SYSTEM CONTROL MODULE - FORCED ENGINE RUNNING

Description:  This DTC indicates the antilock braking system (ABS) module requested the engine on.
Possible Causes: 
  • Intake air system leak
  • Positive crankcase ventilation (PCV) system
  • Vacuum leak
  • Vacuum pump
  • Vacuum pump circuit
Diagnostic Aids:  Check for any unmetered air leaks. Diagnose any air intake system related DTCs.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.