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Engine-Codes – Generic – P30B2

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

Quick Answer

The diagnostic trouble code P30B2 indicates a low voltage condition in the Intake Camshaft Profile Actuator Position Sensor 4 circuit. Common causes include Faulty Intake Camshaft Profile ActuatorOpen or shorted wiring in the Intake Camshaft Profile Actuator harnessPoor electrical connections within the actuator circuitFaulty Engine Control Module (ECM)Contamination or mechanical wear affecting the actuator mechanism. 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 indicates Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage.
Common causes
Common causes include Faulty Intake Camshaft Profile ActuatorOpen or shorted wiring in the Intake Camshaft Profile Actuator harnessPoor electrical connections within the actuator circuitFaulty Engine Control Module (ECM)Contamination or mechanical wear affecting the actuator mechanism.
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 Description

The diagnostic trouble code P30B2 indicates a low voltage condition in the Intake Camshaft Profile Actuator Position Sensor 4 circuit. This sensor plays a crucial role in the engine's variable valve timing (VVT) system by monitoring the position of the actuator pins that adjust the camshaft profile. The actuator can switch between different profiles, such as high-lift and low-lift, which optimizes engine performance, enhances fuel efficiency, and reduces emissions based on driving conditions. The sensor employs Hall-effect technology to provide real-time feedback to the Engine Control Module (ECM) regarding the actuator's position.
OBDII Code P30B2 - Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage
P30B2 Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage

Common Causes of P30B2

  1. Faulty Intake Camshaft Profile Actuator
  2. Open or shorted wiring in the Intake Camshaft Profile Actuator harness
  3. Poor electrical connections within the actuator circuit
  4. Faulty Engine Control Module (ECM)
  5. Contamination or mechanical wear affecting the actuator mechanism

Symptoms of P30B2

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Reduced engine performance or power
  3. Poor fuel economy
  4. Rough idling or engine misfires
  5. Increased emissions and potential failure of emissions tests

How to Fix P30B2

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

Cost to Fix P30B2

The cost to diagnose and repair a P30B2 code typically ranges from $150 to $600, depending on the specific cause of the issue. Parts such as the Intake Camshaft Profile Actuator or the position sensor can range from $100 to $300, while labor costs can vary significantly based on location and shop type, generally falling between $80 and $150 per hour. Dealerships may charge higher rates, while independent shops may offer more competitive pricing. Always consult with a qualified technician for an accurate estimate based on your vehicle's make, model, and specific issues.

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Code P30B2 Information for Specific Makes

  • P30B2 Chevrolet — Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage
  • P30B2 GMC — Intake Camshaft Profile Actuator Position Sensor 4 Circuit Low Voltage
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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