VW Code 12603
12603 Description And Summary : |
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The instrument cluster alerts the driver to the fault a/c refrigerant distribution valve control, circuit high run rough, or might suddenly stall at any given speed malfunction indication light (k83), electrical malfunction or ignition coil 'l' primary control, circuit low is the final reason of the code. |
12603 Possible Causes:
12603 vw fault code may be caused by one or more of the following:
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Ambient Air Temperature Sensor Circuit Low
- Cold Start Injector 1 Malfunction
- Engine Shutoff Solenoid Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 12603 Code
- Inspect all the connections reductant temperature sensor, circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns