AutoCodes – GMC – P16CF GMC

P16CF GMC Code - Intake Rocker Arm Solenoid Valve 2 Control Circuit

Quick Answer

The rocker arm actuator system enables the Engine Control Module (ECM) to change the camshaft lift and duration while the engine is operating. Common causes include Faulty Intake Rocker Arm Solenoid Valve 2, Intake Rocker Arm Solenoid Valve 2 harness is open or shorted, Intake Rocker Arm Solenoid Valve 2 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: P16CF GMC indicates Intake Rocker Arm Solenoid Valve 2 Control Circuit.
Common causes: Common causes include Faulty Intake Rocker Arm Solenoid Valve 2, Intake Rocker Arm Solenoid Valve 2 harness is open or shorted, Intake Rocker Arm Solenoid Valve 2 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 2,200

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 Jan 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16CF GMC Description

The rocker arm actuator system enables the Engine Control Module (ECM) to change the camshaft lift and duration while the engine is operating. The camshaft has 3 lobes for each intake valve. The inner lobe is for low lift and the 2 outer lobes are for high lift. The rocker arm solenoid valve controls the 2-step lift by controlling the oil flow to the rocker arm. In default mode, a locking pin locks the inner and outer mechanisms of the rocker arm together to provide high lift. When low lift is commanded, oil pressure retracts a locking pin within the rocker arm.
The rocker arm solenoid valve receives a signal from the ECM. The ECM controls the rocker arm solenoid valve by supplying a 12 V PWM signal. The ECM supplies a ground to the low reference circuit.

OBDII Code P16CF GMC - Intake Rocker Arm Solenoid Valve 2 Control Circuit - AutoCodes.com — P16CF GMC Code - Intake Rocker Arm Solenoid Valve 2 Control Circuit

What does this mean?

What are the Possible Causes of the DTC P16CF GMC?

Faulty Intake Rocker Arm Solenoid Valve 2
Intake Rocker Arm Solenoid Valve 2 harness is open or shorted
Intake Rocker Arm Solenoid Valve 2 circuit poor electrical connection

How to Fix the DTC P16CF GMC?

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 P16CF GMC 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.

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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.

Frequently Asked Questions about P16CF GMC Code

1. What are common symptoms of OBDII code P16CF GMC related to the Intake Rocker Arm Solenoid Valve 2 Control Circuit?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and a noticeable decrease in engine performance.

2. What are the potential causes of OBDII code P16CF GMC indicating an issue with the Intake Rocker Arm Solenoid Valve 2 Control Circuit?

- Possible causes include a faulty intake rocker arm solenoid valve, damaged wiring or connectors, low engine oil levels, or issues with the engine control module (ECM).

3. How can I diagnose the Intake Rocker Arm Solenoid Valve 2 Control Circuit issue triggering OBDII code P16CF GMC?

- Diagnose the problem by using a scan tool to retrieve the specific trouble code, inspecting the wiring and connectors for damage, testing the solenoid valve for proper function, and checking oil levels.

4. Are there any DIY repair tips for addressing OBDII code P16CF GMC associated with the Intake Rocker Arm Solenoid Valve 2 Control Circuit?

- DIY repair tips include ensuring proper oil levels and quality, inspecting wiring and connectors for damage, and replacing the intake rocker arm solenoid valve if necessary.

5. Can driving with OBDII code P16CF GMC related to the Intake Rocker Arm Solenoid Valve 2 Control Circuit cause further damage to the vehicle?

- Continuing to drive with this issue can potentially lead to further engine damage, decreased performance, and increased fuel consumption, so prompt attention and repair are recommended.

6. How much does it typically cost to repair OBDII code P16CF GMC linked to the Intake Rocker Arm Solenoid Valve 2 Control Circuit?

- The cost of repair can vary depending on the underlying cause, but it may range from $100 to $500 for parts and labor, excluding diagnostic fees.

7. Is it safe to clear the OBDII code P16CF GMC without addressing the underlying issue with the Intake Rocker Arm Solenoid Valve 2 Control Circuit?

- Clearing the code without fixing the root cause can temporarily eliminate the warning light, but the problem will persist and potentially worsen over time, leading to more severe issues.