Source-backed diagnostic reference

P2135 Code: Meaning & Diagnostic Guide

Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

Reference status: This page preserves source-backed code definitions for discovery. Manufacturer/model applicability, repair steps and safety conclusions are not treated as verified unless a manufacturer-specific verified report is available.

What does P2135 mean?

AUDI: Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue Source
GENERIC: Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation Source
GENERIC: Throttle/Pedal Position Sensor "A"/"B" Voltage Correlation Source

P2135 quick answer

P2135 generally means the vehicle detected a mismatch between related throttle or accelerator-pedal position signals. The code identifies a signal-correlation problem; it does not by itself confirm which part, if any, has failed.

Is P2135 generic or manufacturer-specific?

P2135 has a generic source-backed definition in this database, with additional manufacturer-labelled references for AUDI. The exact vehicle make, model, year and powertrain should be confirmed before using a definition for diagnosis.

How P2135 works in the vehicle

The engine controller compares signals from position sensors labeled A and B. “Voltage correlation” means those signals do not agree as expected. The precise signal strategy and diagnostic procedure can vary by vehicle.

P2135 symptoms

Depending on the vehicle and the underlying issue, possible symptoms may include reduced engine power, uneven acceleration, or a warning light. A code alone does not establish which symptoms will occur.

Possible causes of P2135

Possible causes depend on the vehicle. Sensor, wiring, connector, or control-module problems are listed in one manufacturer-specific reference, but that listing does not establish that any of them applies to every vehicle with P2135.

How to diagnose P2135

Record all stored codes and available freeze-frame data before clearing anything.
Check the vehicle-specific service information for how P2135 is defined and tested.
Have a qualified technician inspect relevant connectors and wiring for visible damage or poor connections.
Use vehicle-appropriate diagnostic equipment to compare the position-sensor signals and follow the manufacturer's test procedure.
Confirm the cause with test results before replacing parts.

How to fix P2135

The repair depends on the confirmed cause and the vehicle. A technician may need to address a wiring or connection issue, a sensor-related fault, or another problem identified by vehicle-specific testing. Do not replace parts based on the code alone.

Can I drive with P2135?

Driving impact can vary. If acceleration or power is reduced, the vehicle behaves unpredictably, or warning indicators appear, stop in a safe place and seek professional advice. Consult the owner's manual for vehicle-specific guidance.

P2135 frequently asked questions

Does P2135 confirm that a throttle or pedal sensor has failed?

No. It reports a mismatch between related position signals, not a confirmed failed component.

Can P2135 have different causes on different vehicles?

Yes. The signal strategy and diagnostic procedure can vary, so use the service information for the specific vehicle.

Can I keep driving with P2135?

The impact varies. If the vehicle has reduced power, unpredictable acceleration, or other concerning behavior, stop safely and seek professional guidance.

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