P0122: Throttle/Pedal Position Sensor/Switch A Circuit Low
Do not keep driving
Expect very reduced power or limp mode. If other sensor codes appeared simultaneously, say so — that pattern points at one shared supply fault rather than several failures.
What this code means
The throttle position signal is below its valid range, normally a short to ground or a lost reference supply. The module reads this as a permanently closed throttle and will not deliver power. Where several sensors report low at once, the shared five-volt reference is the place to look rather than each sensor in turn.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Failed sensor reference voltage supply · moderate
- Faulty throttle position sensor · moderate
Less common
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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