Modern Caterpillar engines use sophisticated valve actuation systems—including oil pressure-controlled actuators and electrical solenoids—to fine-tune combustion and boost efficiency. But when something goes wrong, the ECM throws specific fault codes tied to the valve train. Here are such codes worth investigating ASAP.

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Code 1922-7 – Intake Valve Actuation Oil Pressure Control Valve: Not Responding Properly

Cause: The valve is not reacting to ECM signals—possibly stuck or failed.
Troubleshooting Tips:

• Inspect the solenoid connector for oil or moisture intrusion.
• Use CAT ET to command valve operation and monitor feedback.
• Replace the solenoid if mechanical or electrical response is abnormal.

Code 1905-5 – Intake Valve Actuator #5: Current Below Normal

Cause: Electrical signal to the actuator is weaker than expected.
Troubleshooting Tips:

• Measure resistance across actuator terminals.
• Check wiring harness for shorts or open circuits.
• Replace actuator if resistance is out of range or no response during test.

Code 1903-6 – Intake Valve Actuator #3: Current Above Normal

Cause: Excess current draw usually indicates internal coil failure or short.
Troubleshooting Tips:

• Inspect for melted connector pins or overheated actuator housing.
• Compare current draw to other actuators using CAT ET.
• Replace actuator or wiring harness as needed.

Code 2738-4 – Turbo Compressor Inlet Pressure: Voltage Below Normal (May Affect VVA Logic)

Cause: Low pressure or false reading may impact variable valve timing behavior.
Troubleshooting Tips:

• Confirm turbo and intake system pressure is within spec.
• Replace or recalibrate the sensor if readings are inaccurate.

Code 2610-6 – Cylinder #5 Injector Actuator #2: Current Above Normal

Cause: Overcurrent indicates the injector actuator solenoid may be shorted.
Troubleshooting Tips:

• Check the ECM driver circuit for injector 5.
• Measure coil resistance and voltage at idle.
• Replace actuator or ECM driver if confirmed faulty.

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Valve train control systems have evolved—but with complexity comes sensitivity. If you’re seeing actuator or solenoid codes, don’t ignore them. Diagnosing these early prevents power loss, fuel inefficiency, and head damage.