Parts for your 2015 Honda Accord-Throttle position sensors

2015 Honda Accord throttle position sensors — what they do and how to look after them

Referencing Honda service information for the 2013–2017 Accord (Electronic Throttle Control System), factory diagnostic charts that track “TP Sensor A/B” signals, and OE parts catalogues, the 2015 Honda Accord does use throttle position sensors. They’re built into the electronic throttle body as dual, redundant sensors, while the accelerator pedal has its own accelerator pedal position sensors. That applies to both the 2.4‑litre K24W and 3.5‑litre J35Y engines, so a TPS is definitely relevant on this model.

The throttle position sensors tell the engine computer exactly where the throttle plate sits. On a 2015 Accord, that live data helps the ECU manage air, fuel, spark and idle quality, and also talks to the auto transmission, cruise and stability systems so take‑off feels smooth and shifts are tidy. If the signals drift, drop out or don’t agree with each other, the ECU logs a fault (often P0121–P0123 or P2135), limits throttle as a safety move, and the driver may notice flat acceleration, surging, harsh shifting or an idle that won’t settle.

Because the TPS is integrated into the throttle body, it isn’t adjustable and usually isn’t sold as a separate piece. If diagnosis confirms a TPS fault, the right repair is replacing the throttle body assembly and using a new gasket. Before committing to parts, it’s wise to check the connector and loom under the bonnet for moisture, corrosion or a chafed wire. After throttle body work or a battery disconnect, do an idle/throttle learn so the ECU can recalibrate airflow. On Hondas that means warming the engine, ensuring all accessories are off, then letting it idle undisturbed for several minutes, a proper scan tool can run the procedure more quickly. For routine care, every 30–50,000 kilometres, clean the throttle bore and plate with a throttle‑body safe cleaner, don’t force the plate by hand, and make sure the intake duct is tight and crack‑free to avoid unmetered air sneaking in.

• Watch for tell‑tales like a MIL, limp‑home behaviour, hesitant throttle or a hunting idle.
• Use scan data: TP% should rise smoothly from roughly 10% (key on) to about 80–90% at wide‑open throttle.
• If replacing the body: fit a new gasket, torque fasteners to spec, clear codes, perform the idle learn and road‑test.
• Choose genuine or quality OE‑equivalent parts, cheap units often trigger correlation faults.
• For intermittents, do a gentle wiggle test on the harness while watching TP A/B voltages.

1. Does a 2015 Accord have a separate TPS that can be replaced on its own?

   No. On this model the TPS is built into the electronic throttle body as a paired sensor set, so the fix for a failed sensor is to replace the throttle body assembly. The accelerator pedal has its own position sensors, which are part of the pedal module.

2. Is a relearn needed after cleaning or replacing the throttle body?

   Yes. A throttle/idle learn lets the ECU relearn airflow and target idle. Warm the engine fully, turn all accessories off, and let it idle undisturbed for several minutes, or use a scan tool to run the procedure. Skipping this can leave the Accord with a shaky idle or delayed throttle response.

3. What fault codes point to a TPS issue on a 2015 Accord?

   Common codes include P0121, P0122, P0123 and P2135 for throttle position performance or correlation. Some related ETCS codes (like throttle actuator performance) can appear too. If you see P2138, that one usually relates to the accelerator pedal sensors rather than the throttle body.