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Engine-Codes – GMC – P30B2 2020 GMC Sierra

P30B2 2020 GMC Sierra Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage

Quick Answer

The P30B2 diagnostic trouble code indicates a low 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
P30B2 2020 GMC Sierra indicates Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low 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 P30B2 2020 GMC Sierra Description

The P30B2 diagnostic trouble code indicates a low 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 enhances engine performance by allowing the engine control module (ECM) to adjust the timing of the intake camshaft based on various driving conditions. The sensor utilizes Hall-effect technology to monitor the position of the actuator pins that control the camshaft profile sleeve. By detecting whether the actuator is retracted, extending, or fully extended, the ECM can optimize engine performance, fuel efficiency, and emissions.
OBDII Code P30B2 2020 GMC Sierra - Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage
P30B2 2020 GMC Sierra Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage

Common Causes of P30B2 2020 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 P30B2 2020 GMC Sierra

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased engine performance or sluggish acceleration
  3. Reduced fuel economy
  4. Rough idling or engine misfires
  5. Increased emissions or failed emissions test

How to Fix P30B2 2020 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 voltage at the sensor connector to determine if the sensor is receiving the correct reference voltage from the ECM.
  3. Check the resistance and functionality of the Intake Camshaft Profile Actuator to ensure it operates within specifications.
  4. If necessary, replace the faulty Intake Camshaft Profile Actuator or repair any damaged wiring or connectors.
  5. Clear the diagnostic trouble codes and perform a road test to verify that the issue has been resolved and that the engine operates normally.

Cost to Fix P30B2 2020 GMC Sierra

The cost to diagnose and repair the P30B2 code can vary widely depending on the specific issue and the make and model of the vehicle. Typically, parts such as the Intake Camshaft Profile Actuator may range from $100 to $300, while labor costs can range from $80 to $150 per hour, depending on the shop's location and expertise. Overall, the total repair cost could range from $200 to $600, including parts and labor. Dealerships may charge more, while independent shops may offer more competitive 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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