SCR INJECTOR PRESSURE SENSOR HIGH
Indicates high pressure detected in the SCR injector system.
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What it means (plain English)
The SCR system is using a pressure sensor to monitor how much fluid is being injected to reduce emissions. If the pressure reading goes above the normal range, it indicates a potential problem with the injector or high pressure in the system.
What the computer is actually seeing
The engine control module (ECM) is reading a pressure value from the SCR injector pressure sensor. If this value exceeds the normal operating range, typically around 5-10 PSI during normal operation, the code will set.
What a healthy reading looks like
Typical pressure readings should fall between 5 to 10 PSI. Values consistently above this range trigger the code.
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. Verify the fault code with a scan tool. Clear the code and see if it returns immediately.
- 22. Inspect electrical connectors and wiring related to the SCR pressure sensor for damage, corrosion, or loose connections. Repair as necessary.
- 33. Check SCR fluid level and ensure it is within the specified range, topping off if necessary.
- 44. Use a pressure gauge to measure the SCR injector pressure. Compare the reading to expected values (5-10 PSI). If pressure is excessive, investigate SCR injector and system plumbing for blockages or faults.
- 55. Test the SCR injector pressure sensor using a multimeter. Measure output voltage. It should vary proportionally to changes in pressure (normally around 0.5V to 4.5V). If it’s fixed or outside expected range, replace the sensor.
Common causes
- Faulty SCR injector pressure sensor
- Clogged SCR injector
- Issues with SCR system plumbing
- Faulty ECM calibration
- Electrical issues (wiring or connectors)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you may experience issues with emissions and potential limp mode. Fix this soon.
Will this code come back after repairs?
If all faults are addressed correctly, the code should not return.
Does this code relate to the engine performance?
It primarily affects emissions control; it won't cause engine power loss directly.
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