Your Selected Vehicle
Parts for your 2009 Honda Odyssey-Throttle position sensors
Explore 4WD & Adventure
2009 Honda Odyssey throttle position sensor: purpose, faults, and servicing tips
On the 2009 Honda Odyssey, a throttle position sensor is definitely used. Honda’s 2009 Odyssey Service Manual (Electronic Throttle Control System section) and the Honda OBD-II DTC index list twin throttle position sensors (TP Sensor A and TP Sensor B) built into the electronic throttle body. Independent repair databases such as ALLDATA and Mitchell 1 back this up, noting there’s no separate, cable-era TPS, instead, it’s integrated with the throttle actuator motor.
The throttle position sensors tell the powertrain control module exactly how far the throttle plate is open. Because this Odyssey runs drive-by-wire, the system relies on two TPS signals for redundancy and safety. Those signals help the engine computer manage fuelling, ignition timing, transmission shift quality, cruise control, and cylinder deactivation. If the readings don’t make sense, the van can go into limp-home mode to protect the driveline.
- Common clues of a TPS/throttle body issue: hesitant take-off, surging idle, poor economy, inconsistent gear changes, traction/VSA lights on, and fault codes like P0121–P0123, P0221–P0223, or P2135.
- There’s no scheduled TPS replacement, but the throttle body should be inspected and cleaned of carbon every 30,000–50,000 kilometres, especially if most driving is around town.
On this model, the TPS isn’t serviceable on its own. If testing confirms a faulty sensor, the fix is a complete throttle body assembly. After replacement (or a thorough clean), a throttle/idle relearn is needed so the computer can re‑establish the correct plate position and idle control.
- Battery support on a charger to keep voltage stable.
- Remove intake ducting, never pry the throttle plate by hand.
- If cleaning, use throttle body cleaner and a lint‑free cloth, avoid soaking the motor or sensors.
- Refit with a new gasket, reconnect harnesses. Don’t touch any stop screws.
- Perform idle relearn via scan tool, or warm the engine fully and let it idle with all accessories off for about 5 minutes, then another 5 minutes with A/C on. Clear any DTCs and road test.
Good workshops also check the harness and connector for moisture or pin tension issues, as these can mimic a failing sensor. Quality parts matter here, cheap throttle bodies can cause repeat faults. Expect roughly 0.8–1.2 hours of labour plus parts, depending on access and relearn time.
FAQs
Where is the throttle position sensor on a 2009 Honda Odyssey?
The TPS is built into the electronic throttle body mounted on the intake. It’s not a separate bolt-on sensor. The pedal has its own accelerator pedal position sensor, which is a different component.
Can the TPS be replaced on its own?
No. On this model the TPS is integrated with the throttle body and actuator. If the sensor fails, the complete throttle body assembly is replaced, followed by an idle/throttle relearn.
Do I need a relearn after cleaning or replacing the throttle body?
Yes. After cleaning or replacement, the ECU needs to relearn the throttle and idle positions. Use a scan tool procedure where available, or perform a warm-up and 5-minute idle with accessories off, then 5 minutes with A/C on.
