P1506 on Ford
Idle Air Control Overspeed Error
P1506 on Ford vehicles indicates idle air control overspeed error. Au7o has documented this code across 1 Ford model — most commonly on Ranger. This manufacturer-specific code (common on Ford, Lincoln, Mazda, Mercury) means the engine computer detected that idle speed is higher than the target the Idle Air Control (IAC) system is commanding. The IAC valve meters air into the engine at idle to hold a steady RPM; when actual idle RPM runs too high, this overspeed code sets. You may notice a fast or surging idle. It is usually caused by unmetered air entering the engine (a vacuum leak) or a sticking IAC valve rather than a serious engine fault. Typical repair costs on Ford range from $100 to $450, depending on the specific model and root cause.
Common Causes of P1506
- •Vacuum leak letting in extra air
- •Dirty, sticking, or faulty idle air control (IAC) valve
- •Carboned-up or dirty throttle body
- •Stuck-open throttle plate or binding linkage
- •Faulty PCV system or leaking gasket
- •Wiring or connector fault at the IAC valve
P1506 on Ford by Model
Ford Ranger(1 issue)
- Throttle Position Sensor and Idle Air Control Related Stalling/Hanging Idle2000-2011
Many owners of 2000-2011 Rangers report intermittent high idle, unstable idle, or stalling when coming to a stop, often traced to a failing throttle position sensor, dirty or failing idle air control valve, or both. The problem is especially common on older cable-throttle trucks where carbon buildup and sensor wear accumulate with age. Symptoms can be inconsistent, which leads to repeated parts swapping before the root cause is isolated.
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View P1506 across all makes →Frequently Asked Questions
What does P1506 mean on Ford?▼
P1506 stands for "Idle Air Control Overspeed Error." This manufacturer-specific code (common on Ford, Lincoln, Mazda, Mercury) means the engine computer detected that idle speed is higher than the target the Idle Air Control (IAC) system is commanding. The IAC valve meters air into the engine at idle to hold a steady RPM; when actual idle RPM runs too high, this overspeed code sets. You may notice a fast or surging idle. It is usually caused by unmetered air entering the engine (a vacuum leak) or a sticking IAC valve rather than a serious engine fault. On Ford specifically, this code is documented across 1 model.
What causes P1506 on Ford vehicles?▼
Common causes on Ford: Vacuum leak letting in extra air, Dirty, sticking, or faulty idle air control (IAC) valve, Carboned-up or dirty throttle body, Stuck-open throttle plate or binding linkage, Faulty PCV system or leaking gasket. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1506 on a Ford?▼
Repair costs on Ford range from $100 to $450, depending on the specific model and root cause.
Which Ford models have P1506 documented?▼
Au7o has documented P1506 on 1 Ford model: Ranger.