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Engine-Codes – GMC – P30B0 GMC

P30B0 GMC Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit

Quick Answer

The P30B0 code pertains to the Intake Camshaft Profile Actuator Position Sensor 4 Circuit, which plays a crucial role in the operation of the variable valve timing (VVT) system in GMC vehicles. Common causes include Faulty Intake Camshaft Profile Actuator, Intake Camshaft Profile Actuator harness is open or shorted, Intake Camshaft Profile Actuator circuit has poor electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P30B0 GMC indicates Intake Camshaft Profile Actuator Position Sensor 4 Circuit.
Common causes
Common causes include Faulty Intake Camshaft Profile Actuator, Intake Camshaft Profile Actuator harness is open or shorted, Intake Camshaft Profile Actuator circuit has poor electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on May 30, 2026
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Code P30B0 GMC Description

The P30B0 code pertains to the Intake Camshaft Profile Actuator Position Sensor 4 Circuit, which plays a crucial role in the operation of the variable valve timing (VVT) system in GMC vehicles. This sensor is integrated into the intake camshaft profile actuator assembly and is responsible for monitoring the position of the actuator pins that control the camshaft profile sleeve. Utilizing Hall-effect technology, the sensor detects the actuator pin's position and communicates whether it is retracted, extending, or fully extended. This information is vital for the Engine Control Module (ECM) to adjust the camshaft profile dynamically, allowing the engine to switch between different lobe profiles, such as high-lift, low-lift, and cylinder deactivation modes.
OBDII Code P30B0 GMC - Intake Camshaft Profile Actuator Position Sensor 4 Circuit
P30B0 GMC Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit

Common Causes of P30B0 GMC

  1. Faulty Intake Camshaft Profile Actuator
  2. Intake Camshaft Profile Actuator harness is open or shorted
  3. Intake Camshaft Profile Actuator circuit has poor electrical connections
  4. Faulty Engine Control Module (ECM)
  5. Contamination or mechanical wear affecting the actuator pin movement

Symptoms of P30B0 GMC

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased engine performance or power loss
  3. Rough idling or engine stalling
  4. Reduced fuel efficiency
  5. Increased exhaust emissions

How to Fix P30B0 GMC

  1. Perform a visual inspection of the Intake Camshaft Profile Actuator and its wiring harness for any signs of damage or wear.
  2. Test the Intake Camshaft Profile Actuator Position Sensor for proper voltage and signal output using a multimeter.
  3. If the sensor is faulty, replace the Intake Camshaft Profile Actuator Position Sensor with a new unit.
  4. Check and repair any damaged wiring or poor electrical connections in the actuator circuit.
  5. Clear the diagnostic trouble codes from the ECM and conduct a test drive to ensure the issue has been resolved.

Cost to Fix P30B0 GMC

The cost to diagnose and repair the P30B0 code can vary significantly based on the specific issue and the labor rates in your area. Typically, parts such as the Intake Camshaft Profile Actuator Position Sensor may range from $50 to $200, while labor costs can range from $80 to $150 per hour, depending on whether you go to a dealership or an independent shop. Overall, you might expect a total repair cost between $150 and $600, depending on the complexity of the repair and the make and model of your vehicle.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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