What causes fault code P0510?

• Most likely: Faulty idle position switch (microswitch) or integrated TPS sensor • Likely: Incorrect adjustment of the throttle stop screw or linkage • Possible: Open circuit or short to ground in the wiring between switch and ECU • Rare: Dirty or carbon-fouled throttle body preventing mechanical closure

How do you fix fault code P0510?

STEP 1: Inspect throttle linkage and cable for binding. Ensure the throttle plate closes fully. Clean throttle body carbon deposits. STEP 2: Inspect connector and wiring harness for damage. Use a multimeter to test the switch: Continuity (approx. 0 Ohm) should be present when closed, and Open Circuit (OL) when the throttle is opened. STEP 3: Check reference voltage from ECU (typically 5V or 12V). Verify that the voltage signal changes state when the throttle moves. STEP 4: Adjust the switch or TPS according to OEM specifications if applicable. If the internal contact is faulty, replace the switch or TPS assembly. STEP 5: Clear codes and perform a throttle body relearn procedure using a scan tool.

Powertrain (Engine & Gearbox)Standard EOBD

P0510 - Closed Throttle Position Switch Malfunction

Q: What are the symptoms of fault code P0510?

• Check Engine Light (MIL) illuminated • Rough or abnormally high idle speed • Hesitation or jerking during deceleration • Difficulty passing emissions testing • Possible 'Limp home mode' in some vehicle models

Last updated:1 February 2026

Related:Throttle Position Sensor (TPS), Throttle Body, Engine Control Module (ECM/ECU), Idle Air Control (IAC) Valve

System

Powertrain (Engine & Gearbox)

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P0503

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Technical Description

P0510 indicates a malfunction in the Closed Throttle Position Switch circuit. This switch informs the Engine Control Unit (ECU) when the throttle plate is fully closed, which is essential for idle speed control, deceleration fuel cut-off, and engine braking strategies. If the ECU does not detect a change in voltage when the throttle reaches its closed position, the code is triggered. In modern Drive-by-Wire systems, this function is typically integrated into the TPS (Throttle Position Sensor), but older systems utilize a dedicated micro-switch.

Possible Causes

Faulty idle position switch (microswitch) or integrated TPS sensor

Incorrect adjustment of the throttle stop screw or linkage

Open circuit or short to ground in the wiring between switch and ECU

Dirty or carbon-fouled throttle body preventing mechanical closure

Symptoms

Check Engine Light (MIL) illuminated

Rough or abnormally high idle speed

Hesitation or jerking during deceleration

Difficulty passing emissions testing

Possible 'Limp home mode' in some vehicle models

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P0510 - Closed Throttle Position Switch Malfunction

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P0510 - Closed Throttle Position Switch Malfunction

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