P0472 — Exhaust Pressure Sensor A Circuit Low — 7.3 Power Stroke
P0472 means the PCM sees an abnormally low voltage from Exhaust Pressure Sensor A on a 7.3L Power Stroke 1999-2003. On this platform the EBP sensor and…
What it means
The PCM is detecting a low signal from the exhaust back-pressure sensor circuit. On 7.3L Power Stroke 1999-2003 Super Duty/Excursion the EBP system is present for cold idle warm-up; the engine is HEUI with no common rail, no VGT, no EGR/DPF/SCR.12
Most likely causes
- EBP sensor signal shorted to ground or internally failed low — Wiring or sensor fault pulls the signal low; typical EBP circuit low condition on 7.3L.12
- EBP sensor connector corrosion / oil contamination — Exhaust-side heat and moisture degrade the connector, causing low voltage reading.12
- EBP sensor supply/reference voltage low or open — Loss of 5 V reference or power to the sensor makes the signal read low.1
- EBP tube plugged or sensor port blocked — A blocked pressure tube can cause an implausible low reading from the sensor.2
- PCM input fault for EBP circuit — Internal PCM input issue can read the EBP signal low.1
How to diagnose
- Verify code and freeze frame; confirm P0472 on 7.3L Power Stroke 1999-2003.
- Inspect EBP sensor and wiring at the exhaust manifold/pipe and along the harness for heat damage, chafing, corrosion, oil contamination.
- Check EBP sensor reference voltage and ground at the connector with key on; compare to spec.
- Measure EBP signal voltage at idle and with engine warm; compare to expected range and to a known-good reference.
- Inspect and clear the EBP pressure tube and sensor port for soot/plugging; verify tube integrity.
- Perform a wiggle test on the EBP harness while monitoring live data to reveal intermittent low signal.
- If electrical tests pass, compare EBP PID to a similar vehicle or substitute a known-good sensor to isolate sensor vs wiring/PCM.
Parts and tools you may need
- Digital multimeter
- Scan tool with live data
- Safety glasses and gloves
- Contact cleaner
- Basic hand tools
Tools you’ll need
- digital multimeter — Measures reference voltage, ground, and signal voltage at the EBP sensor connector to confirm a low signal or short to ground.
- OBD-II scan tool — Reads P0472, freeze frame, and live EBP PID to verify low signal and monitor changes during wiggle tests.
- borescope — Inspects the EBP pressure tube and sensor port for soot plugging without removing components.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Wiring or connector repair | $10–$100 | 1–4 hrs | DIY with tools and a manual |
| Exhaust backpressure sensor | $60–$200 | 0.5–1.5 hrs | Easy DIY |
| ECM/PCM replacement (programmed) | $600–$2,000 | 1–3 hrs | Shop |
Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If wiring tests are inconclusive, the EBP circuit is intermittent, or PCM input is suspected, have a qualified diesel technician diagnose and repair. Do not attempt high-pressure oil or exhaust repairs without proper training and safety equipment.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Repair videos: P0472 on the 7.3 Power Stroke
Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.
Spotted an error, or something missing? Tell us
Run a 7.3 Power Stroke? This goes straight to the editor — it is not published.