Exhaust Pressure Sensor High

What it means

P0473 is stored when the engine control module measures a voltage in the Exhaust Pressure circuit above the expected maximum, typically because the signal wire is shorted to battery voltage or the circuit is open and pulled up internally.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Symptoms

• Check engine light on, often with no change in driveability
• Failed emissions inspection
• Slight increase in fuel consumption
• Smell from the exhaust in some cases

Common causes

1. Damaged, chafed or corroded wiring in the Exhaust Pressure circuit
2. Corroded, loose or water-damaged connector terminals
3. Failed Exhaust Pressure component (sensor, solenoid or actuator)
4. Poor ground connection for the module or component
5. Faulty control module driver (rare, confirm all else first)

How to diagnose

1. Read freeze frame data and note when the code set (cold start, under load, after rain)
2. Inspect the Exhaust Pressure connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
3. Measure supply voltage and ground at the connector with the key on
4. Check the signal wire for shorts to ground or battery and for continuity to the control module
5. Test or substitute the Exhaust Pressure only after wiring and connectors are confirmed good
6. Clear the code and complete a drive cycle to confirm the repair

Related codes

Nearby codes in this group

• P0472Exhaust Pressure Sensor Low
• P0474Exhaust Pressure Sensor Intermittent
• P0471Exhaust Pressure Sensor Range/Performance
• P0475Exhaust Pressure Control Valve
• P0470Exhaust Pressure Sensor
• P0476Exhaust Pressure Control Valve Range/Performance
• P0469EVAP Purge Flow Sensor Circuit Intermittent
• P0477Exhaust Pressure Control Valve Low