P00AF on Ford
Turbocharger/Supercharger Boost Control "A" Module Performance
P00AF on Ford vehicles indicates turbocharger/supercharger boost control "a" module performance. Au7o has documented this code across 1 Ford model — most commonly on F-150. The PCM uses a boost control module/solenoid ('A') to command the turbocharger or supercharger to the requested boost level. This code sets when the actual boost response does not match the commanded value, indicating the boost control 'A' module or its mechanical linkage is not performing correctly. Typical repair costs on Ford range from $50 to $700, depending on the specific model and root cause.
Common Causes of P00AF
- •Faulty boost control solenoid/module
- •Sticking wastegate or variable-vane mechanism
- •Boost/vacuum leak in control lines
- •Wiring or connector faults
- •Restricted charge-air path or failing turbo
P00AF on Ford by Model
Ford F-150(2 issues)
- EcoBoost Turbo Underboost (P0299) — Boost Leaks, Bypass Valve Diaphragm, and Warped Air Deflector2011-2025
P0299 sets when actual boost is about 4 psi or more below the commanded value for several seconds, dropping the truck into reduced-power limp mode (orange wrench light). On EcoBoost F-150s the most common causes are NOT the turbos themselves but cheaper upstream parts: a loose or popped cold-side intercooler boot/clamp, a torn orange rubber diaphragm inside the electronic turbocharger bypass (blow-off) valve, and cracked charge-pipe couplers. On 14th-gen (2021+) trucks a specific failure is the plastic upper radiator air deflector warping and blocking the passenger-side turbo intake snorkel, starving that turbo for air (updated part ML3Z-8310-D). Wastegate-actuator sticking can also contribute. Owners frequently — and wrongly — replace turbochargers when a smoke test would have found a hose or the bypass-valve diaphragm.
- EcoBoost Turbocharger Wastegate Actuator Rattle2011-2024
Both the 3.5L and 2.7L EcoBoost turbos use exhaust wastegates whose actuator arm/linkage develops play as the bushings wear. The result is a distinctive metallic rattle — most noticeable for the first ~30-60 seconds after a cold start and at light throttle — coming from the turbo area. It is one of the most-searched EcoBoost noises because it sounds alarming but is usually a wear/NVH issue rather than an immediate failure. Ford has issued TSBs: 3.5L wastegate-rattle bulletins and a 2025 TSB for 2024 2.7L trucks (built on/before Oct 4, 2024) where a missing wave spring between the wastegate actuator lever arm and the turbine housing causes the rattle on both turbos.
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View P00AF across all makes →Frequently Asked Questions
What does P00AF mean on Ford?▼
P00AF stands for "Turbocharger/Supercharger Boost Control "A" Module Performance." The PCM uses a boost control module/solenoid ('A') to command the turbocharger or supercharger to the requested boost level. This code sets when the actual boost response does not match the commanded value, indicating the boost control 'A' module or its mechanical linkage is not performing correctly. On Ford specifically, this code is documented across 1 model.
What causes P00AF on Ford vehicles?▼
Common causes on Ford: Faulty boost control solenoid/module, Sticking wastegate or variable-vane mechanism, Boost/vacuum leak in control lines, Wiring or connector faults, Restricted charge-air path or failing turbo. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P00AF on a Ford?▼
Repair costs on Ford range from $50 to $700, depending on the specific model and root cause.
Which Ford models have P00AF documented?▼
Au7o has documented P00AF on 1 Ford model: F-150.