P0470: Exhaust Pressure Sensor Malfunction
Can you still drive? You can drive short distances, but reduced power mode may limit speed and acceleration. Extended driving without repair can damage the DPF on diesel vehicles.
What Does P0470 Mean?
Code P0470 indicates a malfunction in the exhaust back pressure sensor circuit. This sensor measures the pressure in the exhaust system and is commonly found on diesel engines with diesel particulate filters (DPF) and turbocharger systems. The ECM uses this data to manage DPF regeneration, turbo boost, and EGR flow calculations.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty exhaust pressure sensor
- Clogged sensor port or pressure line
- Damaged or melted sensor wiring from exhaust heat
- Corroded sensor connector
- Cracked or disconnected pressure hose to the sensor
Symptoms
- Check engine light on
- Reduced engine power
- DPF regeneration problems
- Poor turbo response
- Increased fuel consumption
Diagnostic Steps
- 1Read exhaust pressure sensor data with a scan tool at idle and compare to expected values
- 2Inspect the sensor and its pressure line for blockages or damage
- 3Check sensor wiring and connector for heat damage or corrosion
- 4Verify sensor reference voltage and ground are within specification
- 5Clear the pressure line with compressed air if blocked
- 6Replace the exhaust pressure sensor if readings are irrational
Recommended Parts & Tools
exhaust pressure sensor
sensor pressure line
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $500 |
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Frequently Asked Questions
What does the exhaust pressure sensor do?
The exhaust pressure sensor measures back pressure in the exhaust system. This information is critical for managing diesel particulate filter regeneration, turbocharger operation, and ensuring the exhaust system is not restricted.
Is this code common on diesel trucks?
Yes, P0470 is primarily found on diesel vehicles equipped with DPF systems. The sensor monitors exhaust back pressure to determine when the DPF needs regeneration to burn off accumulated soot.
Community Fix Reports
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