Injector Control Pressure Too Low - Engine Cranking
The P2291 code means the vehicle's onboard diagnostic system has detected: Injector Control Pressure Too Low - Engine Cranking. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $300 - $2500 (parts and labor)
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What Are the Symptoms of P2291?
- Engine cranks but does not start
- Extended cranking time before startup
- White smoke during cranking attempts
- Check Engine Light on after failed start
- Engine starts only after multiple attempts
What Causes P2291? (Most Likely First)
- High-pressure oil pump not building pressure during cranking Very High
- IPR valve stuck open or leaking High
- Low engine oil level or wrong oil viscosity Moderate
- Standpipe or branch tube O-ring leaking internally Moderate
Can I Still Drive with P2291?
No — stop driving. P2291 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
Can I drive with code P2291?
No, the engine typically will not start or runs very poorly. Do not force extended cranking as it can drain the battery and potentially damage the starter.
What causes P2291?
Very common on Ford 6.0L Powerstroke diesels. The high-pressure oil system has known issues with standpipe O-rings and IPR valves leaking down pressure.
Is P2291 expensive to fix?
Expect $300 to $2500. Ford 6.0L Powerstroke high-pressure oil system repairs are labor intensive and often require removal of the turbo and intake manifold.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2291?
-
Verify engine oil level is at the full mark with correct viscosity
-
Monitor ICP sensor pressure during cranking (should build above 500 PSI)
-
Test the IPR valve for proper sealing and operation
-
Check for internal oil leaks at standpipes and branch tubes
-
Inspect the high-pressure oil system for restrictions
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P2291 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P2291?
- 2003-2010 Ford F-250 6.0L Powerstroke
- 2003-2010 Ford F-350 6.0L Powerstroke
- 2005-2012 Ford E-Series 6.0L Diesel
- 2004-2010 Ford Excursion 6.0L Diesel
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