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Home >> Ford >> 2011 >> Focus S, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions - DTC P0001 Through DTC P0217 - (Except Diesel & Hybrid) >> DTC P0034: Turbocharger/Supercharger Bypass Valve A Control Circuit Low

DTC P0034: Turbocharger/Supercharger Bypass Valve A Control Circuit Low

P0034 - TURBOCHARGER/SUPERCHARGER BYPASS VALVE A CONTROL CIRCUIT LOW

Description:  The powertrain control module (PCM) continuously monitors the TCBY circuit for concerns. This DTC sets when the PCM detects a short to ground in the circuit.
Possible Causes: 
  • Damaged turbocharger bypass (TCBY) valve
  • TCBY circuit short to ground
  • Damaged harness connector
  • Damaged harness
Diagnostic Aids:  Check the harness for intermittent concerns, incorrect connections, routing, alterations and damage due to contact with other components.
This DTC only sets when the valve is commanded closed.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST HN .