P0506 on Chevrolet
Idle Air Control System RPM Lower Than Expected
P0506 on Chevrolet vehicles indicates idle air control system rpm lower than expected. Au7o has documented this code across 2 Chevrolet models — most commonly on Corvette, Equinox. This code means the engine computer detected that the engine's idle speed is lower than the target idle RPM it commanded. The PCM controls idle speed through the idle air control valve or electronic throttle and sets this code when the actual idle drops below expected. A low or rough idle can cause stalling, hesitation, and reduced drivability. Typical repair costs on Chevrolet range from $150 to $5,000, depending on the specific model and root cause.
Common Causes of P0506
- •Vacuum leak in intake or hoses
- •Dirty or carbon-clogged throttle body
- •Faulty idle air control (IAC) valve
- •Dirty or failing mass airflow sensor
- •Clogged PCV system or EGR sticking open
- •Worn or dirty fuel injectors
- •Excessive engine load from accessories
P0506 on Chevrolet by Model
Chevrolet Corvette(1 issue)
- LT2 Broken Valve Spring Failure on Engines Built June-September 20202020-2021
A defective supplier batch of valve springs went into GM V8 engines built between June 1 and September 15, 2020, including the 6.2L LT2 in the C8 Stingray. Springs broke at astonishingly low mileage — documented C8 failures at 57 miles and at 115 miles, one of which required a flatbed tow. A broken spring drops valve control on that cylinder, producing a misfire, an audible tapping or clattering engine noise, a check engine light, and in the worst case valve-to-piston contact that destroys the head or the engine. GM acknowledged the defect in service bulletin PIP5752A on September 22, 2020, covering seven V8 families (L87, LT1, LT2, LT4, L82, L84, L8T). Owners subsequently reported failures on engines built past the September 15 cutoff, and GM extended the affected build window, so the published date range should be treated as a floor rather than a boundary. This is a discrete supplier defect and is unrelated to the LT2's lifter-tick and DFM behavior.
Chevrolet Equinox(1 issue)
- Turbo Wastegate Regulator Solenoid Failure Causing Overboost/Underboost and Reduced Engine Power2016-2022
The turbocharger wastegate regulator solenoid (and the wastegate actuator linkage) on the turbo engines can stick, weaken, or freeze - moisture and oil condensate can jam the solenoid in cold weather. The result is erratic boost control that trips overboost or underboost faults and throws the vehicle into limp mode with a 'Engine Power Is Reduced' message, sometimes limited to ~15 mph. Testing shows wastegates weakening as early as ~8k miles on hard-used examples. This is a boost-control defect separate from the covered charge-air-cooler condensation issue.
Looking for P0506 on a different make?
View P0506 across all makes →Frequently Asked Questions
What does P0506 mean on Chevrolet?▼
P0506 stands for "Idle Air Control System RPM Lower Than Expected." This code means the engine computer detected that the engine's idle speed is lower than the target idle RPM it commanded. The PCM controls idle speed through the idle air control valve or electronic throttle and sets this code when the actual idle drops below expected. A low or rough idle can cause stalling, hesitation, and reduced drivability. On Chevrolet specifically, this code is documented across 2 models.
What causes P0506 on Chevrolet vehicles?▼
Common causes on Chevrolet: Vacuum leak in intake or hoses, Dirty or carbon-clogged throttle body, Faulty idle air control (IAC) valve, Dirty or failing mass airflow sensor, Clogged PCV system or EGR sticking open. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0506 on a Chevrolet?▼
Repair costs on Chevrolet range from $150 to $5,000, depending on the specific model and root cause.
Which Chevrolet models have P0506 documented?▼
Au7o has documented P0506 on 2 Chevrolet models: Corvette, Equinox.