P0222–P2132 Throttle/Pedal Position Sensor/Switch B Circuit Low
The voltage on this circuit is sitting near zero. Typically a short to earth, or a sensor that has failed to its low end.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P0222 | Throttle/Pedal Position Sensor/Switch B Circuit Low | Investigate soon |
P0227 | Throttle/Pedal Position Sensor/Switch C Circuit Low | Investigate soon |
P2132 | Throttle/Pedal Position Sensor/Switch F Circuit Low | Investigate soon |
The definition
P0222: Throttle/Pedal Position Sensor/Switch B Circuit Low.
P0222 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- Unplug the sensor. If the reading jumps to full scale, the wiring is fine and the sensor has failed low.
- Check the sensor's 5V supply and its earth before condemning the sensor itself.
What actually causes this on a VAG
This is about the second, back-up channel of the electronic throttle system - either in the accelerator pedal module or in the throttle body, depending on your engine. "Circuit low" means the ECU is seeing the voltage on that channel sitting below anything it considers possible, effectively down near zero. That's an electrical complaint rather than a worn-sensor one: a broken wire, a lost supply, or the signal touching earth somewhere. Expect the EPC light and limp mode, because the ECU will not trust a throttle system it can't cross-check - and while limp mode is the car protecting you, a sudden drop to reduced power is a good reason to get it fixed rather than driven around.
Most likely causes, in order
- Damaged wiring or a bad connector. A broken conductor, a pushed-back pin, or a chafed loom touching bare metal will all pull the signal down. If the footwell has ever been damp - blocked plenum/scuttle drains are a known cause of that on VAG cars - say so, because corrosion in footwell connectors follows on from it. A meter on the connector, back-probed with the plug still connected, will confirm it without removing anything.
- Loss of the sensor's reference supply. One 5-volt feed from the ECU often serves several sensors at once. If that feed is broken or shorted, everything on it reads implausibly low together, so a handful of unrelated-looking codes appearing at the same moment is a strong hint that the supply, not the pedal, is the problem. Checking that the sensor is actually being fed comes before anything gets replaced.
- Failed sensor internally. The pedal module or throttle body unit can fail internally so that the second channel simply reads nothing. This is the answer once the wiring, supply and earth have been proven good - not before. On most VAG cars the pedal sensor is only sold as a complete pedal assembly.
Worth knowing: A "low" code is normally chased down with a multimeter and a wiring diagram on a stationary car - no road test and no special equipment needed. If a garage proposes fitting a pedal assembly or a throttle body without first proving the supply, the earth and the signal wire at the plug, they're doing it in the wrong order and you may end up paying twice.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P0222 mean?
P0222 means Throttle/Pedal Position Sensor/Switch B Circuit Low. The voltage on this circuit is sitting near zero. Typically a short to earth, or a sensor that has failed to its low end.
Can I drive with P0222?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.