What does code P1639 mean on Volkswagen vehicles?
The ECU detects that accelerator pedal position sensor signals are out of range or do not correlate correctly.
OBD-II Code Volkswagen
P1639 — Volkswagen — Accelerator Pedal Position Sensor 1/2 Range/Performance Problem
The ECU detects that accelerator pedal position sensor signals are out of range or do not correlate correctly.
Common symptoms
- Limited acceleration
- limp mode
Possible causes
- Faulty APP sensors
- signal correlation fault
Initial recommendation
Replace accelerator pedal position sensor assembly and perform adaptation.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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