Code Definition

P2135 — Throttle / Pedal Position Sensor / Switch A / B Voltage Correlation

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2135

P2135 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2135 is stored, the module has detected a correlation fault — two sensors that should track each other have diverged beyond tolerance; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2135 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Electronic throttle control systems use two independent position sensors so the ECM can continuously cross check one against the other, since a single undetected sensor failure could otherwise produce an unintended throttle opening. The two channels are deliberately given different characteristics, either an offset slope where B reads approximately half of A, or an inverse slope where B falls as A rises, so that no single wiring fault can make both report the same plausible value. P2135 sets when the two signals fall outside their designed relationship by more than the calibrated tolerance for...

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