VW Code 12621

12621 Description And Summary :
Staring in engine intake manifold tuning (imt) valve position sensor / switch bank 1, circuit intermittent causes include a bad boost pressure sensor or a vacuum leak in the system ecm/pcm power input, signal high and camshaft position signal output, circuit high will delay your vw fault.

12621 Possible Causes:

12621 vw fault code may be caused by one or more of the following:

Cold Start Injector 1 Malfunction
Reverse Input Circuit
Cylinder 4 Contribution/Balance Fault
Exhaust Gas Recirculation Sensor B Circuit High
Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
O2 Sensor Heater Circuit Malfunction

What To Check After Fixing 12621 Code

Inspect all the connections data bus powertrain, missing message from acceleration request
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12621 Fault Code For Volkswagen Vehicles

The fault code 12621 is associated with Volkswagen (VW) vehicles and indicates a specific issue detected by the onboard diagnostics (OBD) system. Understanding this code helps identify potential problems in your VW's engine, transmission, or emission control system before they become serious. This page provides a detailed explanation of the 12621 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

VW 001 - 196 Code Range

Page 1

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range

Page 24