Credov

P2122 fault code: what it means

P2122: Accelerator pedal position sensor D circuit low. Power is limited.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. pedal sensor wiring fault
  2. failed accelerator pedal sensor

P2122 by make

Honda

Accelerator pedal position sensor A circuit low. Limp mode possible.

Usual causes: accelerator pedal sensor; wiring fault

Isuzu

Accelerator pedal sensor 1 circuit low. Reduced power mode.

Usual causes: pedal sensor; wiring

LDV

LDV diesel: accelerator pedal sensor 1 circuit low.

Usual causes: pedal sensor; wiring

Mazda

Accelerator pedal position sensor No.1 circuit low. Limp mode with limited power.

Usual causes: accelerator pedal assembly; wiring or connector fault

Nissan

Accelerator pedal position sensor 1 circuit low. Engine may go into limp mode or respond poorly to the pedal.

Usual causes: accelerator pedal assembly (APP sensor 1); wiring or connector fault; sensor power supply 1 circuit

Subaru

Accelerator pedal sensor D circuit low. Poor idle and drivability.

Usual causes: accelerator pedal assembly; wiring fault

Not sure what P2122 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.