P2135 fault code: what it means

P2135: The two throttle position sensor signals disagree. Car usually goes into reduced-power mode.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

worn sensor track in the electronic throttle body
corroded or oily throttle body connector
damaged wiring or weak 5 V reference

P2135 by make

Ford

Throttle/pedal position sensor A/B disagreement: the two sensor readings do not match, usually putting the car in limp mode.

Usual causes: worn electronic throttle body (Focus 2.0, Falcon); accelerator pedal sensor; 5 V sensor supply pulled down by another faulty part

Nissan

Throttle position sensors 1 and 2 disagree (sensors are inside the electric throttle body on Nissan).

Usual causes: faulty electric throttle body (TP sensors); throttle body wiring open or shorted; poor connector contact

Subaru

The two throttle position sensor signals disagree. Usually sets limp mode.

Usual causes: failed throttle body (internal sensor); wiring or connector fault; accelerator pedal sensor fault

Suzuki

Throttle position sensors A/B disagree.

Usual causes: faulty electronic throttle body; throttle wiring or connector

Volvo

Throttle position sensors A/B disagree. Classic Volvo ETM failure on older P2 models.

Usual causes: worn electronic throttle module; throttle wiring or connector

What the repair usually costs

Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200
Electronic throttle body replaceNZ$470–NZ$1,290 · A$440–A$1,190
Parking sensor replace, one sensorNZ$130–NZ$520 · A$130–A$510

Not sure what P2135 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.