An open or shorted signal wire. A missing 5-volt reference. A failed throttle position sensor.

P0122 Throttle/Pedal Position Sensor/Switch "A" Circuit Low

Q: What does P0122 mean?

P0122 means throttle position sensor A's signal is too low, from wiring or a failed sensor, usually with reduced power. The throttle position sensor A signal voltage is too low, usually from an open wire, a missing 5-volt reference or a failed sensor.

Throttle

P0122 means throttle position sensor A's signal is too low, from wiring or a failed sensor, usually with reduced power.

The throttle position sensor A signal voltage is too low, usually from an open wire, a missing 5-volt reference or a failed sensor.

Can I keep driving? Not if you can avoid it.

Expect reduced power or limp mode, possibly without warning. Get it fixed before relying on the vehicle.

Common causes

An open or shorted signal wire
A missing 5-volt reference
A failed throttle position sensor

Symptoms

Reduced power or limp mode
Poor acceleration
Check-engine light

What to check first

Check the connector and wiring at the throttle body.
Check for 5 volts at the sensor's reference wire with the key on.
Check the signal voltage at closed throttle against spec.
Replace the sensor or throttle body if power and ground are good.

What does P0122 mean on your vehicle?

The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about P0122

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Related codes

General guidance for P0122 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.