What Does P2291 Mean?
The fuel injection control pressure is too low specifically during engine cranking conditions. This indicates the high-pressure fuel system cannot build sufficient pressure to start the engine, common in diesel and direct injection gasoline engines.
Safety Warning
Vehicle will experience no-start or extremely difficult starting conditions. May leave driver stranded in unsafe locations.
Common Causes
40%
High-pressure fuel pump not building pressure during cranking
25%
Injector leaking back excessive fuel preventing pressure buildup
20%
Low-pressure supply pump not delivering adequate feed pressure
10%
Fuel pressure relief valve stuck open or leaking
5%
Air in high-pressure fuel system preventing prime
Diagnostic Steps
1
Step 1: Monitor injection control pressure during cranking with scan tool to verify low pressure condition
2
Step 2: Check fuel supply pressure from low-pressure pump before high-pressure pump inlet
3
Step 3: Perform high-pressure pump mechanical test and check drive coupling condition
4
Step 4: Test individual injector leak-back rates to identify excessive internal leakage
5
Step 5: Bleed air from high-pressure system and verify all connections are sealed properly
Estimated Repair Cost
$400 - $3,000
Parts + labor, varies by vehicle and location
The fuel injection control pressure is too low specifically during engine cranking conditions. This indicates the high-pressure fuel system cannot build sufficient pressure to start the engine, common in diesel and direct injection gasoline engines.
The most common cause of P2291 (Injector Control Pressure Too Low - Engine Cranking) is: High-pressure fuel pump not building pressure during cranking
Typical repair costs for P2291 range from $400 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will experience no-start or extremely difficult starting conditions. May leave driver stranded in unsafe locations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2291 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
