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P2C18 2020 Chevrolet Silverado Code - Exhaust Camshaft Profile Actuator Position Sensor 2 Circuit Low Voltage

Quick Answer

The P2C18 diagnostic trouble code (DTC) indicates that the Exhaust Camshaft Profile Actuator Position Sensor 2 circuit is experiencing low voltage. Common causes include Faulty Exhaust Camshaft Profile Actuator, Exhaust Camshaft Profile Actuator harness is open or shorted, Poor electrical connection in the Exhaust 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
P2C18 2020 Chevrolet Silverado indicates Exhaust Camshaft Profile Actuator Position Sensor 2 Circuit Low Voltage.
Common causes
Common causes include Faulty Exhaust Camshaft Profile Actuator, Exhaust Camshaft Profile Actuator harness is open or shorted, Poor electrical connection in the Exhaust 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 31, 2026
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Code P2C18 2020 Chevrolet Silverado Description

The P2C18 diagnostic trouble code (DTC) indicates that the Exhaust Camshaft Profile Actuator Position Sensor 2 circuit is experiencing low voltage. This sensor is crucial for the operation of the exhaust camshaft profile actuator, which adjusts the camshaft's position to optimize engine performance under varying conditions. The actuator modifies the lift profile of the exhaust valves, allowing for improved efficiency, reduced emissions, and enhanced power delivery. When the engine control module (ECM) receives feedback from the sensor indicating that the actuator pins are not in the expected position, it can lead to suboptimal engine performance.
OBDII Code P2C18 2020 Chevrolet Silverado - Exhaust Camshaft Profile Actuator Position Sensor 2 Circuit Low Voltage
P2C18 2020 Chevrolet Silverado Code - Exhaust Camshaft Profile Actuator Position Sensor 2 Circuit Low Voltage

Common Causes of P2C18 2020 Chevrolet Silverado

  1. Faulty Exhaust Camshaft Profile Actuator
  2. Exhaust Camshaft Profile Actuator harness is open or shorted
  3. Poor electrical connection in the Exhaust Camshaft Profile Actuator circuit
  4. Faulty Engine Control Module (ECM)
  5. Mechanical issues such as sticking actuator pins or debris inside the actuator

Symptoms of P2C18 2020 Chevrolet Silverado

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Reduced engine power or performance
  3. Increased fuel consumption
  4. Rough idling or misfiring
  5. Unusual engine noises during operation

How to Fix P2C18 2020 Chevrolet Silverado

  1. Perform a visual inspection of the Exhaust Camshaft Profile Actuator and its wiring for any signs of damage or wear.
  2. Test the Exhaust Camshaft Profile Actuator Position Sensor for proper voltage and signal output using a multimeter.
  3. Check the electrical connections and harness for continuity and ensure there are no open or shorted circuits.
  4. If the sensor or actuator is faulty, replace the defective component with a new one.
  5. Clear the fault codes from the ECM and perform a test drive to verify that the issue has been resolved and the engine operates normally.

Cost to Fix P2C18 2020 Chevrolet Silverado

The cost to diagnose and repair the P2C18 code typically ranges from $200 to $600, depending on the specific issue and whether parts need to be replaced. 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 and the complexity of the repair.

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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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