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Engine-Codes – GMC – P30B1 GMC

P30B1 GMC Code - Intake Camshaft Profile Actuator Position Sensor 4 Performance

Quick Answer

The P30B1 diagnostic trouble code (DTC) indicates a performance issue with the Intake Camshaft Profile Actuator Position Sensor 4 in GMC vehicles. Common causes include Faulty Intake Camshaft Profile Actuator, Intake Camshaft Profile Actuator harness is open or shorted, Poor electrical connection in the Intake Camshaft Profile Actuator circuit. 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
P30B1 GMC indicates Intake Camshaft Profile Actuator Position Sensor 4 Performance.
Common causes
Common causes include Faulty Intake Camshaft Profile Actuator, Intake Camshaft Profile Actuator harness is open or shorted, Poor electrical connection in the Intake Camshaft Profile Actuator circuit.
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 P30B1 GMC Description

The P30B1 diagnostic trouble code (DTC) indicates a performance issue with the Intake Camshaft Profile Actuator Position Sensor 4 in GMC vehicles. This sensor is a critical component of the variable valve timing (VVT) system, which optimizes engine performance by adjusting the timing of the intake valves based on various driving conditions. The sensor monitors the position of the actuator pins that control the camshaft profile sleeve, allowing the Engine Control Module (ECM) to switch between different camshaft profiles—high-lift for performance and low-lift for fuel efficiency. When the ECM detects that the sensor's feedback does not align with the expected position, it triggers the P30B1 code.
OBDII Code P30B1 GMC - Intake Camshaft Profile Actuator Position Sensor 4 Performance
P30B1 GMC Code - Intake Camshaft Profile Actuator Position Sensor 4 Performance

Common Causes of P30B1 GMC

  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 P30B1 GMC

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

How to Fix P30B1 GMC

  1. Perform a visual inspection of the wiring and connectors associated with the Intake Camshaft Profile Actuator for damage or corrosion.
  2. Check the resistance and voltage of the Intake Camshaft Profile Actuator Position Sensor to ensure it is functioning within specifications.
  3. Test the actuator for proper operation and movement; replace if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors in the actuator circuit.
  5. Clear the DTC from the ECM and perform a road test to verify that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P30B1 GMC

The cost to diagnose and repair the P30B1 code typically ranges from $200 to $800, depending on the specific issues found and the parts required. Labor costs can vary significantly, with most shops charging between $80 and $150 per hour. Dealerships may charge higher rates, while independent shops may offer more competitive pricing. The total cost will also depend on the make and model of the vehicle, as well as the engine type.

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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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