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TuningBot DTC Database · v4.37.15

P1639 VAG - Diagnostic Trouble Code (2 interpretations)

Manufacturer-specific interpretation for VAG. All interpretations of P1639

P · PowertrainEngineOBD2

What P1639 means

P1639
Accelerator pedal position (APP) sensor 1/2 - range/performance problem VAG · engine Data confidence 62%

The control module judged the Accelerator pedal position (APP) sensor 1/2 behaviour implausible for the current operating conditions. This is the manufacturer-specific definition used by Audi.

Possible causes

  • Wiring
  • APP sensor
Applies to Audi
P1639
Accelerator Position Sensor 1/2 (G79/G185): Implausible Signal VAG · engine Data confidence 84%

The control module judged the Accelerator Position Sensor 1/2 (G79/G185) signal implausible when compared with other operating data. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 18047. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).

Symptoms

  • Malfunction Indicator Light (MIL) ON
  • Reduced Engine Output

Possible causes

  • Wiring and/or connections faulty
  • Faulty ECM
  • Faulty Accelerator Pedal

Recommended checks

  • Check Measuring Block Readings for Accelerator Pedal
  • Check Voltage Signals from ECM to Throttle Pedal (see factory repair manual)
  • Check Wiring and Connectors from ECM to Accelerator Pedal
Applies to Volkswagen

Related and nearby codes

How to read P1639

P

Powertrain: engine, transmission and driveline systems.

1

Manufacturer-defined range: the meaning can differ between brands.

639

Specific fault index within the subsystem.

Frequently asked questions about P1639

What does P1639 mean?

Diagnostic Trouble Code (2 interpretations). The control module judged the Accelerator pedal position (APP) sensor 1/2 behaviour implausible for the current operating conditions. This is the manufacturer-specific definition used by Audi.

Is P1639 generic or manufacturer-specific?

P1639 is a manufacturer-specific code. In this database it is documented for: VAG. The same number can mean something different on other brands.

Can TuningBot remove P1639 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningStage 1 dyno results for VAG engines See the results →

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