Excessive SCR Emitter System Pressure
The SCR system is reporting high pressure levels.
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What it means (plain English)
The computer is detecting that the pressure in the SCR system is higher than it should be, which can indicate a blockage or pump issue.
What the computer is actually seeing
The SCR pressure sensor reads higher than expected values, often above 100 kPa (14.5 psi) depending on the engine load and conditions.
What a healthy reading looks like
Normal SCR system pressure should be between 30 to 70 kPa (around 4.35 to 10.15 psi) under normal operation.
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.
- 1Check SCR system pressure with a scan tool or pressure gauge. Is it above 100 kPa (14.5 psi)? If yes, proceed to step 2.
- 2Inspect all DEF lines for blockages, kinks, or leaks. Any visible damage? If yes, repair as necessary and retest pressure.
- 3Test the SCR pressure sensor output with a multimeter. Is the voltage between 0.5V to 4.5V under normal flow? If not, replace the sensor.
- 4Check the DEF pump operation. Is it delivering fluid correctly? If the pump is not working, replace it and retest the system.
Common causes
- Blocked DEF lines
- Faulty SCR pressure sensor
- Failed DEF pump
- Exhaust restriction
- Faulty SCR systemcomponents
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle?
It's not recommended to drive the vehicle for long distances as it may affect emissions control and performance.
Will this error come back?
It can come back if the underlying issue such as a blockage or faulty sensor is not addressed.
Why is this code paired with other SCR codes?
High pressure can affect multiple components in the SCR system, causing multiple codes to trigger.
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