Injector Control Pressure Too Low - Engine Cranking
What does P2291 mean?
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.
Common Symptoms
- 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
Probable Causes (Ranked by Likelihood)
- 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
Step-by-Step Diagnostic Procedure
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Verify engine oil level is at the full mark with correct viscosity
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Monitor ICP sensor pressure during cranking (should build above 500 PSI)
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Test the IPR valve for proper sealing and operation
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Check for internal oil leaks at standpipes and branch tubes
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Inspect the high-pressure oil system for restrictions
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.