OBD-II Code
P0472
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)
$20–$450
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$20 (DIY tube cleaning) to $450 (sensor + tube + harness pigtail labor).
P0472 means the Exhaust Back Pressure (EBP) sensor is reporting a voltage below the ECM's calibrated low threshold — typically below 0.2-0.5V on a 0-5V analog sensor or below the equivalent digital floor on a CAN-based sensor.
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 procedureP0472 means the Exhaust Back Pressure (EBP) sensor is reporting a voltage below the ECM's calibrated low threshold — typically below 0.2-0.5V on a 0-…
P0472 means the Exhaust Back Pressure (EBP) sensor is reporting a voltage below the ECM's calibrated low threshold — typically below 0.2-0.5V on a 0-5V analog sensor or below the equivalent digital floor on a CAN-based sensor.
Cheapest-first ladder on a shop floor
- Unplug the EBP sensor and inspect the connector for soot, oil, or water intrusion — diesel EBP sensors mount on a tube that bolts directly to the exhaust manifold and the connector ends up living in a heat-soaked, oil-misted hellscape; a $5 wire brush and a dab of dielectric grease fixes maybe 20% of P0472s.
- Scan live data and compare EBP psi to expected: a healthy naturally-aspirated gas engine reads 0-2 psi at idle and climbs to 5-10 psi at WOT; a stock turbo gas engine reads 1-3 psi at idle and 15-30 psi at full boost; a diesel reads 1-4 psi at idle and 30-50 psi at full load with the exhaust brake engaged. P0472 means the sensor is reading flat or near-zero when the engine is loaded — almost always a clogged sensor tube (carbon-packed orifice the gas can't reach) or a broken signal wire shorted to ground.
- Backprobe the sensor signal wire with a DMM at key-on engine-off — should sit at the sensor's reference voltage (usually 0.5V or thereabouts); a hard 0V means short-to-ground in the harness, a floating reading means open circuit. Expensive-misdiagnosis caveat: diesel EBP sensor tubes plug solid with soot from extended idle and short-trip duty cycles — clean the tube with carb cleaner and a length of MIG wire before condemning the $80-150 sensor; a $5 cleaning saves the part nine times out of ten on a Powerstroke or Cummins.
Vehicle-specific patterns2003-2007 Ford 6.0L Powerstroke (F-250/350/Excursion) is the most common P0472 ticket in North American diesel shops — the EBP sensor sits on the pas…
- 2003-2007Ford 6.0L Powerstroke (F-250/350/Excursion) is the most common P0472 ticket in North American diesel shops — the EBP sensor sits on the passenger-side valve cover with a tube routed to the up-pipe and the tube clogs from soot every 40-80k miles; the fix is almost never the sensor, it's pulling the tube and clearing it with carb cleaner and compressed air.
- 2008-2010Ford 6.4L Powerstroke runs a similar setup and fails the same way, often paired with DPF-related codes when the truck spends too much time at idle.
- 2007-2010Duramax LMM (and to a lesser extent the 2011-2016 LML and 2017+ L5P) uses the EBP signal as part of DPF differential-pressure logic — a low EBP reading shows up alongside P244A/P2459 regen codes; clean the lines before condemning anything.
- 2007-2009RAM Cummins 6.7L uses the EBP signal to command the exhaust brake actuator; a P0472 on a Cummins kills exhaust-brake function until the soot is cleared. Common diesel concern: soot-bound EBP plumbing from extended highway non-regen cruise — recommend an active regen via scan tool (Forscan, EdgeFCS, AlfaOBD) before parts.
Estimated repair$20 (DIY tube cleaning) to $450 (sensor + tube + harness pigtail labor).
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