Engine Aftertreatment System 1, Exhaust Pressure Sensor Out of Range - High
The exhaust pressure sensor reading is too high for the system's parameters.
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What it means (plain English)
The exhaust pressure sensor measures how much exhaust pressure is in the system. If it's reading higher than it should, it means there might be a blockage or failure in the system.
What the computer is actually seeing
The Engine Control Module (ECM) detects an exhaust pressure reading outside the predefined threshold, usually more than 5 psi when the engine is idling and more than 15 psi under load.
What a healthy reading looks like
Expected exhaust pressure is typically between 1-5 psi at idle and should not exceed 15 psi at full load.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the exhaust system for any visible blockages or damage. Clear any obstructions found. Is the blockage gone?
- 22. Inspect the exhaust pressure sensor wiring and connectors for damage or corrosion. Repair any faults found. Is the wiring intact?
- 33. Using a scan tool, monitor the exhaust pressure readings while the engine runs. Are values within expected ranges?
- 44. If high readings persist, test the exhaust pressure sensor with a multimeter. Compare resistance values against specifications. Is the sensor defective?
- 55. Check the exhaust for leaks that might affect pressure readings. Are there any noticeable leaks?
Common causes
- Blocked exhaust system
- Faulty exhaust pressure sensor
- Damaged wiring or connectors to the sensor
- Faulty turbocharger or wastegate
- Exhaust system leaks
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive long distances; it may lead to further damage to the exhaust system.
Will the code come back if I clear it?
If the underlying issue is not resolved, it likely will return.
Why does this code pair with SPN 6730?
SPN 6730 indicates a problem with the aftertreatment system, which can cause similar high pressure readings.
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