P0122 is one of the electrical faults around the throttle. The engine won't take throttle or barely responds, the check engine light is on, and the Sea-Doo often runs with reduced power. The good news is that with this code the cause is often a connector or a wire, and you can check that yourself.
What BRP says about P0122
The official BRP fault code list has eight wordings for P0122. They fall into two groups, and which one applies depends on the vehicle and the control module:
| Sensor involved | BRP wording |
|---|---|
| Throttle accelerator sensor 1 (TAS) | Short circuit to ground, open circuit or short to ground, TAS 1 fault |
| Throttle position sensor (TPS) | Shorted to ground or open circuit, shorted to ground, throttle position sensor voltage too low |
The TAS reads how far you squeeze the throttle. The TPS sits on the throttle body and reports where the plate actually is. Either way, P0122 means the signal is too low. That typically happens when the signal wire touches ground or the circuit is open. The plain-language text in the app tells you which of the two sensors your machine is talking about.
For context: per the BRP list, P0123 is the opposite, shorted to battery or voltage too high. P0222 covers throttle accelerator sensor 2 shorted to ground, and P2135 means TAS 1 and TAS 2 don't agree.
Common causes
- Corroded or wet connector at the throttle sensor or the throttle body.
- Chafed wire that touches ground on the hull, frame or engine.
- Broken wire or a pin that backed out of the connector.
- Damage after work on the handlebar, throttle lever or throttle body.
- Failed sensor.
The right check order
- Write down the code and text: TAS or TPS? Active or stored? Any related codes like P0222 or P2135?
- Check the battery, so you don't mistake a voltage problem for a sensor fault.
- Unplug the affected sensor connector with the key off, clean it and check for water and green crust.
- Live data wiggle test: key on, engine off, roll the throttle slowly from closed to full and back. The value should rise and fall smoothly. Then gently wiggle the harness. If the value jumps, you found the spot.
- Clear and test ride. If P0122 comes right back as active, the circuit is permanently faulty.
- Replace the sensor only once wiring and connector are definitely good. After throttle body work, do a TPS reset.
Reading and clearing P0122 with the app
M-JET DIAGNOSTIC connects to the diagnostic port over Bluetooth and shows P0122 in plain language with its status, often with a possible cause and check steps. Live data shows throttle and throttle plate values in real time, which is perfect for the wiggle test. The TPS reset relearns the throttle after a replacement. Only run it with a stable power supply and according to the manufacturer's instructions. For the basics of reading codes on a Sea-Doo, see Sea-Doo fault code reading without a dealer.
Clearing is not a repair. As long as the wire is shorting to ground, the code will come back.
When to take it to a shop
If the connector check and the wiggle test don't turn anything up, the harness needs proper measurements. The same goes for several throttle sensor codes at once, or a code that returns right after a new sensor. A machine that doesn't respond reliably to the throttle shouldn't be ridden more than necessary anyway.
Frequently asked questions
Is P0122 the same on Sea-Doo and Can-Am?
The principle is, a signal that is too low. Whether it refers to the throttle accelerator sensor or the throttle position sensor depends on the vehicle and module, per BRP. The app shows it in plain language.
Will a TPS reset fix P0122?
Not for a short to ground or an open circuit. Fix the wiring first, then relearn if needed.
Why does P0122 only show up sometimes?
That almost always points to a loose contact or moisture in a connector. A wiggle test with live data finds those spots fastest.
