Closed Throttle Position Switch Malfunction
The P0510 code indicates a malfunction in the closed throttle position switch circuit. This switch is part of the throttle position sensor (TPS) and tells the PCM when the throttle is fully closed. A fault can cause incorrect idle control, poor acceleration, and may trigger the check engine light.
01. Most Common Causes
- Faulty throttle position sensor (TPS)
- Wiring or connector issues in the TPS circuit
- Carbon buildup on throttle body affecting switch operation
02. Symptoms You Will Notice
- Check engine light on
- Rough idle or stalling
- Poor acceleration or hesitation
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0510 is present.
Step 2: Inspect TPS wiring and connector for damage or corrosion.
Step 3: Test TPS voltage with a multimeter at closed throttle (should be ~0.5V).
Step 4: Check for carbon buildup on throttle body and clean if necessary.
Step 5: Replace TPS if voltage readings are out of spec.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as it can cause stalling or poor drivability, which may be unsafe.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the vehicle and shop rates.