Exhaust Pressure Sensor Circuit High
The P0473 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust pressure sensor that is higher than the expected range. This sensor monitors backpressure in the exhaust system, often related to the diesel particulate filter (DPF) or exhaust gas recirculation (EGR) system. A high circuit condition can be caused by a faulty sensor, wiring issues, or actual high exhaust backpressure due to a clogged DPF or exhaust restriction.
01. Most Common Causes
- Faulty exhaust pressure sensor
- Short to voltage in sensor wiring or connector
- Clogged diesel particulate filter (DPF) or exhaust system restriction
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Excessive exhaust smoke
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0473 and check for additional codes.
Step 2: Visually inspect the exhaust pressure sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor voltage signal with a multimeter; compare to manufacturer specifications.
Step 4: Check exhaust backpressure with a gauge to rule out a clogged DPF or exhaust restriction.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to reduced performance and potential damage to the exhaust system or engine. Limp mode may activate, limiting speed.
How much does it cost to fix?▼
The cost to diagnose and repair P0473 typically ranges from $50 to $150 for sensor replacement, but can be higher if the DPF needs cleaning or replacement.