OBD-II Code P0470 — What It Means & How to Fix It

What Does This Error Mean?

P0470 means the engine computer detected an abnormal signal from the exhaust pressure sensor. This sensor monitors pressure in the exhaust system, often used on diesel engines with variable geometry turbochargers. When the signal is out of range or erratic, the computer logs P0470. You may notice reduced engine power, poor fuel economy, or a rough-running engine.

Affected Models

Diesel trucks and SUVs (2003+)
Common in Ford 6.0L and 6.4L Power Stroke diesels
Common in Dodge/Ram 5.9L and 6.7L Cummins
Common in Duramax-powered GM trucks
Some import diesel vehicles

Common Causes

Faulty exhaust pressure sensor (also called backpressure sensor) sending a bad signal
Wiring harness to the exhaust pressure sensor is damaged, corroded, or has a broken connector
Exhaust pressure sensor port or tube is clogged with soot and carbon
Exhaust leak upstream of the sensor affecting the pressure reading
PCM/ECM failure causing a false sensor reading (rare)

How to Fix It

Locate the exhaust pressure sensor. On most diesel trucks it is mounted on the exhaust manifold, DPF (diesel particulate filter), or the connecting tube between them. It will have a single or two-wire electrical connector.

Refer to your vehicle's service manual for the exact sensor location. On Ford Power Stroke engines it is near the turbocharger.
Inspect the wiring harness and connector going to the sensor. Look for chafed wires, melted insulation, corrosion in the connector pins, or a cracked connector body. Repair any damage found.

Heat damage is common near exhaust components. Even a slightly loose connector can cause this code.
Locate the small port or tube that connects to the sensor. Use a thin wire or compressed air to clear any soot or carbon buildup from the port and tube.

A clogged port is a very common cause on high-mileage diesels. Carbon blocks the passage and gives the sensor a false reading.
Use a scan tool to monitor the exhaust pressure sensor live data. At idle, readings should be close to atmospheric pressure. If the reading is stuck, pegged high, or jumpy, the sensor itself is likely faulty.

Compare readings to the expected values in your vehicle's service data. A healthy sensor shows smooth, steady readings that change with engine load.
Replace the exhaust pressure sensor if cleaning and wiring checks did not resolve the issue. Clear the code and drive 50 to 100 miles to confirm it does not return.

Always use a quality replacement sensor. Cheap aftermarket sensors on diesels are known to fail quickly due to heat and vibration.

When to Call a Professional

If cleaning the sensor port and checking wiring does not clear the code, a shop can diagnose and replace the sensor. Exhaust pressure sensors typically cost $20 to $80 for the part. Labor is usually 30 to 60 minutes at a shop. Total repair cost is typically $100 to $250.

Frequently Asked Questions

Is P0470 a diesel-only code?

P0470 is almost always found on diesel engines. Gasoline engines rarely have exhaust pressure sensors. If you have a gas vehicle with P0470, check that a sensor was not added as part of a performance or emissions modification.

Can I drive with P0470?

In most cases, yes — but power and fuel economy may be reduced. On some vehicles, the engine may enter a reduced-power or limp mode. You should diagnose and fix this code soon to avoid damage to the turbocharger or DPF system.

Will P0470 cause me to fail emissions?

Yes. An illuminated check engine light is an automatic emissions test failure in most states. Fix the code and verify the check engine light is off before going in for testing.