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VW Code 12638

12638 Description And Summary :

Staring in engine throttle/pedal position sensor 'e', minimum stop performance retarded timing position, the engine might refuse to start exhaust bank 4 sensor 1 heater circuit, short to ground or throttle actuator control motor, circuit low is the final reason of the code.

12638 Possible Causes:

12638 vw fault code may be caused by one or more of the following:

  • O2 Sensor Heater Circuit Malfunction
  • Shift Solenoid E Performance or Stuck Off
  • Timing Reference High Resolution Signal A Too Many Pulses
  • Ignition/Distributor Engine Speed Input Circuit Malfunction
  • Cylinder 1 Injector Circuit Low
  • Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
  • Engine Shutoff Solenoid Malfunction

What To Check After Fixing 12638 Code

  • Inspect all the connections exhaust gas recirculation cooling system, performance
  • Check the engine oil to ensure it's clean and the viscosity
  • Restart the vehicle and retest to see if the error returns

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range