Parts for your 2005 Honda Odyssey-Throttle position sensors

2005 Honda Odyssey throttle-position-sensors (TPS)

Yes, the 2005 Honda Odyssey uses throttle-position-sensors. Honda’s own service information for this model (PGM-FI/ETCS sections) identifies an electronic throttle control system with dual throttle position sensors (often labelled TP Sensor A and B) built into the throttle body. The factory parts catalogue supplies the throttle body as an assembly with the sensors integrated, and the diagnostic section lists TPS-related DTCs such as P0121–P0123 and P2135—clear signs the TPS function is fitted and monitored by the ECU.

On a 2005 Odyssey, the TPS tells the engine computer exactly how far the throttle plate is open, so fuelling, ignition timing and idle control can stay crisp and consistent. Because this Odyssey is drive-by-wire, the ECU uses inputs from both the accelerator pedal position (APP) sensors and the twin TPS units in the throttle body to command the motorised throttle plate. That redundancy is there for safety and accuracy.

There’s no scheduled replacement for the TPS, it’s a “monitor and maintain” item. During routine servicing, it’s smart to inspect the throttle body and connector, and gently clean the throttle bore and plate to prevent sticky operation. Use a throttle-body-safe cleaner, avoid soaking the shaft area, and don’t force the plate open by hand. After cleaning, perform the ECU idle learn procedure (via scan tool/HDS, or the manual warm-up and 5-minute idle method) so the computer relearns the correct throttle angle at idle.

• Typical TPS-related symptoms: erratic idle, surging, flat spots on tip-in, poor fuel economy, limp-home behaviour, or a check engine light with codes like P0121, P0122, P0123 or P2135. Similar symptoms with P2138 point more to the accelerator pedal sensors.
• Basic checks: scan live data for smooth throttle angle from closed to wide open with no dropouts, inspect the wiring and connector for corrosion or chafing, confirm good grounds and 5V reference.

If diagnosis confirms a failed TPS on this Odyssey, the usual repair is replacing the throttle body assembly, as the sensors are factory-calibrated and not meant to be adjusted separately. Fit a quality unit (gasket included), torque fasteners evenly, and reconnect the intake ducting with no air leaks. After installation, clear codes and run the throttle/idle learn. Most workshops allow about 1–1.5 hours. Owners in Australia and New Zealand will find this is a fairly straightforward job for a competent technician with the right scan tool.

Does the 2005 Odyssey have a replaceable TPS, or do they need the whole throttle body?

The throttle position sensors are integrated into the electronic throttle body on this model. Honda supplies the complete assembly, and there’s no factory adjustment procedure for the TPS. Some aftermarket sensors exist, but results vary because calibration is critical. Most workshops replace the throttle body and then carry out the idle/throttle learn.

What fault codes usually point to a TPS issue on a 2005 Odyssey?

Common ECU codes include P0121 (TPS range/performance), P0122 (TPS low voltage), P0123 (TPS high voltage) and P2135 (TP sensor correlation). If you see P2138, that’s typically the accelerator pedal position sensors rather than the TPS. Always confirm with live data and wiring checks before replacing parts.

Idle is high or hunting after cleaning or replacing the throttle body—what now?

That’s often a learned-value issue. Make sure there are no air leaks at the intake duct or throttle body gasket, then perform the ECU idle learn procedure (via HDS or the manual warm-up and 5-minute idle method with all accessories off). If it still misbehaves, recheck for vacuum leaks and confirm the throttle plate isn’t being held open by carbon at the edges.