AutoCodes – GMC – P2649 GMC

P2649 GMC Code - Intake Rocker Arm Solenoid Valve 1 Control Circuit High Voltage

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 1, Intake Rocker Arm Solenoid Valve 1 harness is open or shorted, Intake Rocker Arm Solenoid Valve 1 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: P2649 GMC indicates Intake Rocker Arm Solenoid Valve 1 Control Circuit High Voltage.
Common causes: Common causes include Faulty Intake Rocker Arm Solenoid Valve 1, Intake Rocker Arm Solenoid Valve 1 harness is open or shorted, Intake Rocker Arm Solenoid Valve 1 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,259

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2649 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 P2649 GMC - Intake Rocker Arm Solenoid Valve 1 Control Circuit High Voltage - AutoCodes.com — P2649 GMC Code - Intake Rocker Arm Solenoid Valve 1 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2649 GMC?

Faulty Intake Rocker Arm Solenoid Valve 1
Intake Rocker Arm Solenoid Valve 1 harness is open or shorted
Intake Rocker Arm Solenoid Valve 1 circuit poor electrical connection

How to Fix the DTC P2649 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 P2649 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.

Need more information about the P2649 GMC code?

Need more information on how to fix the P2649 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2649 GMC code diagnosed by a professional: Find a repair shop in your area

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 P2649 GMC Code

1. What are the common symptoms of OBDII code P2649 related to the Intake Rocker Arm Solenoid Valve 1 Control Circuit High Voltage?

The common symptoms include rough idling, decreased engine performance, and illuminated Check Engine Light.

2. What are the potential causes of OBDII code P2649 in a GMC vehicle?

Common causes of this code include a faulty intake rocker arm solenoid valve, wiring issues in the control circuit, or problems with the Engine Control Module (ECM).

3. How serious is OBDII code P2649 related to the Intake Rocker Arm Solenoid Valve 1 Control Circuit High Voltage?

While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the engine over time.

4. Can driving with OBDII code P2649 cause further damage to the vehicle?

Continuing to drive with this code may lead to reduced engine performance, poor fuel economy, and potential long-term engine damage if left unresolved.

5. How can I diagnose OBDII code P2649 at home?

You can start diagnosing this code by checking the wiring connections to the intake rocker arm solenoid valve, inspecting for any visible damage, and testing the solenoid valve for proper functioning.

6. Is it possible to repair OBDII code P2649 on my own?

Depending on your experience and access to tools, you may be able to replace the intake rocker arm solenoid valve yourself. However, diagnosing and repairing wiring or ECM issues may require professional assistance.

7. Are there any preventative maintenance tips to avoid OBDII code P2649?

Regularly servicing and inspecting the engine components, including the intake rocker arm solenoid valve, can help prevent issues that may trigger this code.

8. Can a bad intake rocker arm solenoid valve cause other OBDII trouble codes to appear?

Yes, a malfunctioning intake rocker arm solenoid valve can cause related issues that may trigger additional trouble codes, impacting the overall performance of the vehicle.

9. How much can I expect to pay for repairs related to OBDII code P2649?

The cost of repairs can vary depending on the extent of the issue and whether you choose to address it yourself or seek professional help. Costs may include parts and labor.

10. Will resetting the Check Engine Light resolve OBDII code P2649?

Simply resetting the Check Engine Light without addressing the underlying issue will not fix the problem. It is crucial to diagnose and repair the root cause of the code to prevent it from reoccurring.