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Engine-Codes – Generic – P30B3

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

Quick Answer

The diagnostic trouble code P30B3 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 shortedIntake Camshaft Profile Actuator circuit poor electrical connectionFaulty Engine Control Module (ECM)Contaminated or damaged actuator pin. 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 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 shortedIntake Camshaft Profile Actuator circuit poor electrical connectionFaulty Engine Control Module (ECM)Contaminated or damaged actuator pin.
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 Description

The diagnostic trouble code P30B3 indicates a high voltage condition in the Intake Camshaft Profile Actuator Position Sensor 4 circuit. This sensor is a critical component of the variable camshaft timing (VCT) system, which adjusts the timing of the intake camshaft to optimize engine performance, fuel efficiency, and emissions. The sensor utilizes Hall-effect technology to determine the position of the actuator pins that control the camshaft profile sleeve. By monitoring the position of these pins, the Engine Control Module (ECM) can switch between various camshaft profiles, such as high-lift for performance and low-lift for fuel economy.
OBDII Code P30B3 - Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage
P30B3 Code - Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage

Common Causes of P30B3

  1. Faulty Intake Camshaft Profile Actuator
  2. Intake Camshaft Profile Actuator harness is open or shorted
  3. Intake Camshaft Profile Actuator circuit poor electrical connection
  4. Faulty Engine Control Module (ECM)
  5. Contaminated or damaged actuator pin

Symptoms of P30B3

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased engine performance or power loss
  3. Rough idling or engine stalling
  4. Increased fuel consumption
  5. Unusual engine noises, such as knocking or pinging

How to Fix P30B3

  1. Perform a thorough visual inspection of the wiring harness and connectors for damage or corrosion.
  2. Test the Intake Camshaft Profile Actuator Position Sensor for proper voltage and resistance values.
  3. If the sensor is faulty, replace it with a new component and ensure proper installation.
  4. Check the actuator assembly for mechanical issues, such as sticking pins or contamination, and repair or replace as necessary.
  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 P30B3

The cost to diagnose and repair a P30B3 code can vary significantly based on the specific vehicle make and model, as well as the location and type of repair shop. 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. Overall, the total repair costs may fall between $150 and $600, depending on the complexity of the repair and any additional components that may need attention. Dealership rates tend to be higher, while independent shops may offer more competitive pricing.

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Code P30B3 Information for Specific Makes

  • P30B3 Chevrolet — Intake Camshaft Profile Actuator Position Sensor 4 Circuit High Voltage
  • P30B3 GMC — Intake Camshaft Profile Actuator Position Sensor 4 Circuit High 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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