P0473: Exhaust Pressure Sensor High Input - Causes, Fixes & Cost [2026]
What is P0473? P0473 sets when the exhaust back-pressure sensor voltage exceeds the calibrated maximum (often >4.8V). Common causes are an unplugged sensor, an open signal wire, or a short to 5V/12V supply.
🎯 Top 3 Causes Ranked by Probability
48%
#1 - Most Likely
Open Signal Wire or Disconnected Sensor
When the signal wire is open, the PCM pull-up pegs voltage at 5V. Often as simple as a pulled-back pin or unseated connector.
🔨 Part
$5-$50
👨🔧 Labor
$50-$180
⚡ DIY
Easy
37%
#2 - Check First
Failed Sensor (Internal Open)
The sensor element has gone open-circuit. Replacement is straightforward.
🔨 Part
$80-$280
👨🔧 Labor
$60-$200
⚡ DIY
Easy
15%
#3 - Less Common
Short to Battery Voltage
Chafed signal wire touching a 12V source. Rare but visible on inspection.
🔨 Part
$10-$60
👨🔧 Labor
$100-$250
⚡ DIY
Medium
🔧 Step-by-Step Diagnosis
- Inspect the EBP sensor connector for pulled pins, missing seal, or full disconnect.
- Key on, read live sensor voltage. A reading near 5V confirms high input.
- Unplug the sensor and short the signal pin to ground at the connector. Voltage on the scan tool should drop to 0V - confirms the wire is good and the sensor is open.
- If voltage stays at 5V with the signal shorted to ground, the signal wire is broken between sensor and PCM.
- Replace the sensor or repair the wire as identified.
🚗 Most Affected Vehicles
🚫 Is It Safe to Drive with P0473?
Short term yes. Expect derate and failed DPF regens. Fix promptly.
❓ Frequently Asked Questions
What is the difference between P0472 and P0473?
P0472 is signal voltage too low (short to ground or shorted sensor). P0473 is signal voltage too high (open circuit or short to power). They are opposite-direction faults.
Will P0473 cause a derate?
On most 2007+ diesels, yes. The PCM defaults to a reduced power map until the signal returns to range.
Is the EBP sensor easy to replace?
Yes on most platforms - it is a single-bolt sensor with a 3-wire connector and a small steel feed tube. 30-60 minutes is typical.
Can a corroded connector cause P0473?
Yes. Corrosion that opens the signal pin will set P0473 because the PCM sees the 5V pull-up with no sensor pulling it down.
Should I replace the EBP tube with the sensor?
If the tube is rusted or clogged, yes - they often go together. A clean tube is essential for the new sensor to read correctly.