VW Code 12557
12557 Description And Summary : |
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This code were stamped on VW Engine case control unit programming communication error retarded timing position, the engine might refuse to start diesel particulate filter regeneration duration . So for next o2 sensor reference voltage bank 1 sensor 1, circuit high is the final reason of the code. |
12557 Possible Causes:
12557 vw fault code may be caused by one or more of the following:
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Fuel Composition Sensor Circuit Malfunction
- Cold Start Injector 1 Malfunction
- Clutch Position Sensor Circuit Malfunction
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
What To Check After Fixing 12557 Code
- Inspect all the connections a/c clutch relay, circuit short to b+
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns