Injector Control Pressure Regulator Circuit High
The P2625 code means the vehicle's onboard diagnostic system has detected: Injector Control Pressure Regulator Circuit High. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $1200 (parts and labor)
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Common Symptoms
- Excessively high injection pressure
- Harsh engine running
- Injector seal leaks from over-pressure
- Loud diesel knock
Probable Causes (Ranked by Likelihood)
- IPR valve stuck closed building excess pressure Very High
- Short to voltage in IPR control circuit High
- ECM commanding full pressure erroneously Moderate
- Blocked oil drain passage from IPR Low
Step-by-Step Diagnostic Procedure
-
Monitor ICP pressure for over-pressure condition
-
Test IPR valve solenoid for stuck position
-
Check IPR control circuit for short to power
-
Inspect IPR oil drain for blockage
Frequently Asked Questions
Can high ICP damage injectors?
Yes. Excessive injection control pressure can overwhelm injector seals, cause injector stiction, and lead to premature injector failure.
What does diesel knock indicate with P2625?
Over-pressurized injectors deliver too much fuel too aggressively, causing excessively rapid combustion that produces the characteristic knocking sound.
How do I release excess ICP pressure safely?
Turn off the engine and wait for pressure to bleed down naturally. Do not attempt to open the high-pressure oil system while pressurized.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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