P0470
UniversalThe Exhaust Pressure Sensor (EPS) detects exhaust gas pressure, and a P0470 code indicates a general malfunction in the circuit or the sensor itself. This often means the sensor is sending an incorrect or implausible signal to the Powertrain Control Module (PCM).
Medium SeverityThis code signifies that the exhaust pressure sensor, a component critical for monitoring exhaust gas flow and back pressure, is not functioning correctly. This malfunction can lead to issues with engine performance and regeneration cycles in diesel particulate filter systems, impacting fuel economy and emissions.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before working on exhaust components. Wear appropriate safety gear, including gloves and eye protection. Exercise caution around hot exhaust parts. If working with electrical components, disconnect the battery before beginning any repair to prevent electrical shock or damage.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or sluggish acceleration
- Poor fuel economy
- Excessive black smoke from exhaust (especially in diesel engines)
- Failure of Diesel Particulate Filter (DPF) regeneration (diesel engines)
Common Causes
- Faulty exhaust pressure sensor
- Clogged or restricted exhaust pressure sensor tube/port
- Wiring harness open or shorted
- Poor electrical connection at the sensor
- Damaged exhaust system component causing abnormal back pressure (less common)
Frequently reported on: Ford F-250/F-350 6.7L Power Stroke (2011-2016), Chevrolet Silverado/GMC Sierra 6.6L Duramax (2007-2016), Ram 2500/3500 6.7L Cummins (2010-2017)
Diagnostic Steps
- Locate the exhaust pressure sensor. It is typically found near the exhaust manifold or on the exhaust pipe, often with a tube running to the exhaust stream.
- Inspect the wiring harness and connector for any visible damage, corrosion, or loose connections. Repair as necessary.
- Disconnect the electrical connector from the sensor.
- If accessible, remove the exhaust pressure sensor. Be careful as exhaust components can be fragile or seized.
- Inspect the sensor port and any connecting tube for carbon buildup or blockages. Clean if possible.
- Install a new exhaust pressure sensor, ensuring it is properly seated and the electrical connector is securely reattached.
- Clear the P0470 code using an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
While replacing the exhaust pressure sensor can be a DIY task, it is crucial to have the system properly diagnosed if the issue persists after replacement or if other related codes are present. A professional can use advanced diagnostic tools to verify sensor readings and check for issues within the exhaust system or wiring harness.
Commonly Asked Questions
What does the exhaust pressure sensor do?
The exhaust pressure sensor monitors the pressure of exhaust gases and sends this information to the engine's computer. This data is crucial for engine performance, fuel efficiency, and proper operation of emission control systems, especially in diesel engines with DPFs.
Can I drive with a P0470 code?
While you may be able to drive with a P0470 code, it is not recommended for extended periods. It can lead to reduced engine power, poor fuel economy, and potential damage to emission control systems like the DPF due to improper regeneration.
Is a P0470 code always a faulty sensor?
Not always. While a faulty sensor is common, the code can also be triggered by a clogged sensor tube, damaged wiring, a poor electrical connection, or even excessive back pressure in the exhaust system itself. Thorough diagnosis is key.
How do I clear the P0470 code?
After performing repairs, you can clear the P0470 code using an OBD-II scanner. Once cleared, drive the vehicle to allow the engine's computer to complete its diagnostic cycles and confirm the repair was successful.
What tools do I need to fix P0470?
You will typically need an OBD-II scanner to read and clear codes, a socket wrench set (often with deep sockets or specialty wrenches depending on sensor location), and possibly a wire brush or carbon cleaner if the sensor port is clogged. Always check your vehicle's specific repair manual.