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Engine-Codes – GMC – P30B3 2021 GMC Sierra

P30B3 2021 GMC Sierra Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage

Quick Answer

The P30B3 code indicates a high voltage condition in the Intake Camshaft Profile Actuator Position Sensor 4 circuit. Common causes include Faulty Intake Camshaft Profile ActuatorIntake Camshaft Profile Actuator harness is open or shortedPoor electrical connection in the Intake Camshaft Profile Actuator circuitFaulty Engine Control Module (ECM)Contamination or mechanical wear affecting the actuator pin movement. 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
P30B3 2021 GMC Sierra indicates Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage.
Common causes
Common causes include Faulty Intake Camshaft Profile ActuatorIntake Camshaft Profile Actuator harness is open or shortedPoor electrical connection in the Intake Camshaft Profile Actuator circuitFaulty Engine Control Module (ECM)Contamination or mechanical wear affecting the actuator pin movement.
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 29, 2026
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Code P30B3 2021 GMC Sierra Description

The P30B3 code indicates a high voltage condition in the Intake Camshaft Profile Actuator Position Sensor 4 circuit. This sensor is a critical component of the variable valve timing (VVT) system, which plays a significant role in optimizing engine performance, fuel efficiency, and emissions. The sensor is integrated into the intake camshaft profile actuator assembly and utilizes Hall-effect technology to monitor the position of the actuator pins. These pins control the camshaft profile sleeve, allowing the engine to switch between different camshaft lobe profiles such as high-lift, low-lift, and cylinder deactivation modes. By doing so, the engine can adapt to various driving conditions, enhancing performance and efficiency.
OBDII Code P30B3 2021 GMC Sierra - Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage
P30B3 2021 GMC Sierra Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage

Common Causes of P30B3 2021 GMC Sierra

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

Symptoms of P30B3 2021 GMC Sierra

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased engine performance or power loss
  3. Rough idling or engine stalling
  4. Poor fuel economy
  5. Unusual engine noises during operation

How to Fix P30B3 2021 GMC Sierra

  1. Perform a visual inspection of the wiring and connectors associated with the Intake Camshaft Profile Actuator for any signs of damage or corrosion.
  2. Test the Intake Camshaft Profile Actuator and its position sensor for proper operation using a multimeter.
  3. Check the ECM for any software updates or faults that may affect the actuator's performance.
  4. If necessary, replace the faulty Intake Camshaft Profile Actuator or its position sensor.
  5. Clear the diagnostic trouble codes and perform a road test to ensure the issue is resolved and the engine operates smoothly.

Cost to Fix P30B3 2021 GMC Sierra

The cost to diagnose and repair a P30B3 code can vary significantly depending on the specific issue and the make and model of the vehicle. Typically, parts such as the Intake Camshaft Profile Actuator or position sensor can range from $100 to $400. Labor costs can vary widely, with most shops charging between $80 and $150 per hour. Overall, you might expect to pay between $200 and $800 for the entire repair, depending on the complexity of the issue and local labor rates.

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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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