OBD-II Code
P0471
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)
$200–$1,400
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$200 to $1,400 (depending on whether DPF service is needed).
P0471 is the range/performance variant of P0470 — the EBP sensor signal is in range electrically but doesn't track plausibly against engine load, turbo boost commanded, or expected back-pressure curves.
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 procedureP0471 is the range/performance variant of P0470 — the EBP sensor signal is in range electrically but doesn't track plausibly against engine load, tur…
P0471 is the range/performance variant of P0470 — the EBP sensor signal is in range electrically but doesn't track plausibly against engine load, turbo boost commanded, or expected back-pressure curves. The ECM cross-references EBP against MAF, MAP, commanded turbo vane position, and EGR duty cycle; when EBP fails to rise under load, stays elevated at idle, or lags transient throttle inputs, P0471 sets.
Cheapest-first ladder
- Datalog EBP voltage alongside MAP and commanded turbo position during a 15-minute warm drive — EBP should rise smoothly with load from 0.8V idle baseline to 2.5-3.5V under heavy acceleration on diesels (proportional to the 0-30 psi scale), or 1.0-2.0V on gas applications under load (proportional to 0-10 psi).
- Flat or lagging EBP under load with healthy boost numbers means the sensor's pressure tube is partially clogged — soot accumulation on diesels is the #1 cause.
- Elevated EBP at idle (above 1.5V on a diesel) with no load means actual exhaust restriction — DPF saturation, collapsed exhaust pipe, or stuck-shut variable-geometry turbo vanes.
- Remove the sensor and clear the pressure tube with a stiff wire and compressed air; reinstall and recheck.
- If the tube is clear and the sensor still reads implausibly, swap-test with a known-good unit before tearing further. Before condemning the EBP sensor, check whether the DPF has recently failed a regen cycle — a partially loaded DPF reads as elevated EBP and the ECM flags the sensor when the DPF is the actual culprit ($1,200 DPF service vs. $250 sensor swap that fixes nothing).
Vehicle-specific patterns2003-2007 Ford 6.0L Powerstroke is the canonical P0471 — same soot-clogged EBP tube as P0470 but the sensor still reads partially, just lagging or bi…
- 2003-2007Ford 6.0L Powerstroke is the canonical P0471 — same soot-clogged EBP tube as P0470 but the sensor still reads partially, just lagging or biased low; the dual-tube delete kit is the permanent fix.
- 2008-2010Ford 6.4L Powerstroke shares the issue with the added complication of the regen-event EBP spike that ages the sensor faster.
- 2011-2016Duramax LML throws P0471 from DPF saturation reading back to the EBP sensor as elevated baseline.
- 2007-2018Duramax L5P sees the issue less frequently due to improved DPF management.
- 2007-2018RAM Cummins 6.7L throws P0471 from soot-clogged tubes plus stuck variable-geometry turbo vanes creating real elevated back-pressure.
- 2009-2014VW 2.0 TDI throws P0471 from a sensor that drifts after extended highway-only duty cycles (no regen events) loading the DPF.
Estimated repair$200 to $1,400 (depending on whether DPF service is needed).
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