AutoCodes – Chevrolet – P2C18 2021 Chevrolet Silverado

P2C18 2021 Chevrolet Silverado Code - Exhaust Camshaft Profile Actuator Position Sensor 2 Circuit Low Voltage

Quick Answer

The Exhaust Camshaft Profile Actuator Position Sensor is part of the exhaust camshaft profile actuator assembly and provides feedback to the ECM regarding the position of the actuator pins that shift the exhaust camshaft profile sleeve. Common causes include Faulty Exhaust Camshaft Profile Actuator, Exhaust Camshaft Profile Actuator harness is open or shorted, Exhaust Camshaft Profile Actuator circuit poor electrical connection. 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 2021 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, Exhaust Camshaft Profile Actuator circuit poor electrical connection.
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.

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Code Popularity 18

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 31, 2026

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2C18 2021 Chevrolet Silverado Description

The Exhaust Camshaft Profile Actuator Position Sensor is part of the exhaust camshaft profile actuator assembly and provides feedback to the ECM regarding the position of the actuator pins that shift the exhaust camshaft profile sleeve. The sensor utilizes a Hall-effect element that reacts to changes in a magnetic field to determine actuator pin position. By monitoring this information, the ECM can verify that the exhaust camshaft has successfully switched between its available cam profiles. This variable-lift system improves engine efficiency, emissions control, and overall performance by allowing the engine to use different valve lift strategies depending on operating conditions.

The sensor may fail because of internal electronic defects, damaged wiring, open or shorted circuits, poor connector contact, or a malfunctioning actuator assembly. Mechanical issues such as sticking actuator pins, sleeve movement problems, or debris inside the actuator can also cause incorrect position feedback. When the ECM detects that the sensor signal is outside the expected range or the reported position does not match the commanded position, it may set a fault code and disable certain variable valve lift functions to protect engine operation.

P2C18 2021 Chevrolet Silverado Code - Exhaust Camshaft Profile Actuator Position Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2C18 2021 Chevrolet Silverado?

Faulty Exhaust Camshaft Profile Actuator
Exhaust Camshaft Profile Actuator harness is open or shorted
Exhaust Camshaft Profile Actuator circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2C18 2021 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2C18 2021 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2C18 2021 Chevrolet Silverado code?

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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.