OBD-II Code
P1247
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$35–$3,500
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P1247 is a Ford EcoBoost-family code indicating Turbo Boost Pressure Low — the PCM commanded a target boost pressure based on throttle and rpm, the MAP sensor in the intake (or charge-air-cooler outlet on 3.5L EcoBoost) reported actual boost, and the delivered pressure fell below threshold (typically more than 3 psi short of target for more than two seconds under load).
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1247 is a Ford EcoBoost-family code indicating Turbo Boost Pressure Low — the PCM commanded a target boost pressure based on throttle and rpm, the M…
P1247 is a Ford EcoBoost-family code indicating Turbo Boost Pressure Low — the PCM commanded a target boost pressure based on throttle and rpm, the MAP sensor in the intake (or charge-air-cooler outlet on 3.5L EcoBoost) reported actual boost, and the delivered pressure fell below threshold (typically more than 3 psi short of target for more than two seconds under load).
Cheapest-first ladder
- visually inspect every charge-air-cooler hose, clamp, and coupler from turbo outlet to throttle body — the cold-side intercooler hose at the throttle body on 3.5L EcoBoost F-150s is the number-one failure point and will literally pop off the throttle body under hard acceleration.
- With engine off, pressure-test the intake tract from compressor outlet to throttle body at 20 psi using a turbo smoke machine; a 5-second leak-down should hold above 18 psi.
- Scan live data and watch commanded vs actual boost; under load a 3.5L EcoBoost should hit 12 to 18 psi commanded and actual within 1 psi at WOT in 3rd gear.
- The expensive misdiagnosis is replacing a turbocharger ($1,800 to $3,500 each on 3.5L EcoBoost) for a $35 popped coupler — always verify the boost tract is sealed before condemning a turbo.
Vehicle-specific patterns2011-2014 Ford F-150 3.5L EcoBoost trucks pop the cold-side intercooler hose at the throttle body — Ford issued multiple TSBs (14-0194 and related) a…
- 2011-2014Ford F-150 3.5L EcoBoost trucks pop the cold-side intercooler hose at the throttle body — Ford issued multiple TSBs (14-0194 and related) and an updated stiffer hose part.
- 2013-2018Ford Focus ST 2.0L EcoBoost cracks the plastic intake manifold near the PCV port, dropping boost and setting P1247 alongside P0299 underboost.
- 2017-2020Ford F-150 3.5L EcoBoost (second-gen, twin-scroll) sets P1247 when the wastegate actuator rod backs off its retaining clip from vibration.
- 2015-2019Ford Edge/Lincoln MKX 2.7L EcoBoost suffers carbon buildup on the wastegate flapper.
Estimated repair$35 to $3,500.
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