What Does P2289 Mean?
The injector control pressure remains abnormally high even after the engine has been shut off. This suggests the pressure relief system is not functioning properly, trapping pressure in the system.
Common Causes
45%
Stuck-closed or failed IPR valve not releasing pressure at shutdown
25%
Blocked or restricted fuel/oil return line preventing pressure bleed-down
15%
Failed check valve in pressure system stuck closed
10%
Contaminated fuel/oil causing IPR valve sticking or sludge buildup
5%
Faulty ICP sensor reading residual pressure incorrectly
Diagnostic Steps
1
Step 1: Key on/engine off - monitor ICP pressure reading and verify it matches atmospheric baseline
2
Step 2: Start engine, then shut off and monitor pressure decay rate; should drop to near-zero within specification time
3
Step 3: Remove and inspect IPR valve for contamination, scoring, or mechanical binding
4
Step 4: Check return line flow by disconnecting at tank and observing fuel return during pressure relief
5
Step 5: Replace IPR valve if stuck; clean system and replace filters if contamination is found
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The injector control pressure remains abnormally high even after the engine has been shut off. This suggests the pressure relief system is not functioning properly, trapping pressure in the system.
The most common cause of P2289 (Injector Control Pressure Too High - Engine Off) is: Stuck-closed or failed IPR valve not releasing pressure at shutdown
Typical repair costs for P2289 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Trapped pressure can cause hard starting and fuel spray hazards during service. May prevent proper engine restart.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2289 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System - High Pressure Injection Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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