P0507 - Idle Control System RPM Higher Than Expected
P0507 means idle speed is higher than the ECM expects. The fault is often caused by extra air entering the engine or throttle control not returning to the expected idle position, but throttle body faults, wiring issues, vacuum leaks, PCV leaks, intake leaks, or idle relearn problems can all create the same high-idle condition.
Code first. Confirm symptoms and checks before pricing parts.
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Common Next Steps
Turn the code into the next check.
Compare trims at idle, 2500 RPM, and cruise before pricing sensors.
Check intake boots, PCV hoses, and post-MAF leak paths.
Inspect MAF contamination and airflow data after intake leaks are considered.
Look for cracked ducts, loose clamps, and unmetered air after the MAF.
Related Inspection
Code Overview
P0507 means idle speed is higher than the ECM expects. The fault is often caused by extra air entering the engine or throttle control not returning to the expected idle position, but throttle body faults, wiring issues, vacuum leaks, PCV leaks, intake leaks, or idle relearn problems can all create the same high-idle condition.
Common Causes
- Dirty throttle body, sticking throttle plate, or idle air control valve issue
- Vacuum leak, PCV leak, brake-booster leak, or intake gasket leak
- MAF data error, throttle position error, or idle relearn issue
- Electrical load, charging voltage, or A/C request affecting idle control
- Vehicle speed sensor or wheel speed data fault where idle or shift strategy is affected
Symptoms
- High idle
- Low idle or stalling
- Speedometer dropout for VSS faults
- Harsh or delayed shifts on some vehicles
- Rough idle when loads are applied
Diagnostic Steps
- Check for air leaks and fuel trims before replacing idle or throttle components
- Inspect throttle body deposits, cable binding where applicable, and idle air passages
- Verify commanded idle versus actual idle with A/C, steering, and electrical loads applied
- Perform throttle or idle relearn only after mechanical and air-leak issues are corrected
- For speed sensor faults, compare scan-tool vehicle speed to wheel speed and instrument cluster behavior
- Verify repair with hot idle in park/drive, decel to stop, A/C load, and road test
Diagnostic Insight
P0507 should be treated as a high-idle airflow and throttle-control problem before replacing the throttle body.
- Carbon buildup, throttle-body sticking, or an incomplete idle relearn are common first checks.
- If idle stays high after throttle inspection, vacuum, PCV, and intake leaks should move up the list quickly.
- Commanded throttle angle, actual throttle position, and idle behavior should be reviewed before parts are replaced.
Repair Difficulty
Moderate
General difficulty estimate for the most common repair path.
Likely Repairs & Cost Guides
Confirm the repair path before pricing parts.
Start here when carbon buildup or a sticking throttle plate is visible and the throttle body still responds correctly.
Use this when cleaning, inspection, and relearn are needed before replacement is justified.
Move here when idle stays high after throttle inspection or fuel trims suggest extra air.
Price this when throttle data, sticking, or actuator testing confirms the assembly is the fault.
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Next Steps
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