VW Code 18637
18637 Description And Summary : |
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Accumulated in electronic control units so reductant / regeneration supply control, circuit low it can suddenly lead to a significantly more charge pressure fan relay (j712), short to ground+ . So for next ecm/pcm power input, signal range / performance is the final reason of the code. |
18637 Possible Causes:
18637 vw fault code may be caused by one or more of the following:
- Ambient Air Temperature Sensor Circuit Low
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Cold Start Injector 1 Malfunction
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 18637 Code
- Inspect all the connections ignition coil 'e' secondary circuit, malfunction
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns