What Does P2623 Mean?
The PCM has detected an open circuit or complete loss of signal in the injector control pressure regulator circuit. This code applies to diesel engines with electronic high-pressure fuel injection systems.
Safety Warning
Engine may not start, run rough, or experience severe power loss. Continued operation may cause fuel system damage or injector failure.
Common Causes
35%
Open or broken wiring in injector pressure regulator control circuit
30%
Failed injector control pressure regulator valve or solenoid
20%
Corroded or damaged connector at pressure regulator
15%
Faulty PCM with failed output driver circuit
Diagnostic Steps
1
Step 1: Inspect injector pressure regulator connector for corrosion, oil contamination, or damaged pins
2
Step 2: Check wiring continuity from PCM to injector pressure regulator on all circuits
3
Step 3: Measure resistance of injector pressure regulator solenoid (typically 2-8 ohms depending on system)
4
Step 4: Monitor commanded versus actual fuel rail pressure with scan tool during operation
5
Step 5: Test PCM output signal to regulator with oscilloscope for proper PWM or voltage signal
Estimated Repair Cost
$250 - $1,500
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or complete loss of signal in the injector control pressure regulator circuit. This code applies to diesel engines with electronic high-pressure fuel injection systems.
The most common cause of P2623 (Injector Control Pressure Regulator Circuit/Open) is: Open or broken wiring in injector pressure regulator control circuit
Typical repair costs for P2623 range from $250 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine may not start, run rough, or experience severe power loss. Continued operation may cause fuel system damage or injector failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2623 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
Diesel 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.
