The 2017 GMC Sierra Denali's sophisticated air suspension system offers a luxurious ride and enhanced capability. However, like any complex system, it's prone to occasional issues. This guide will delve into common service suspension system problems for the 2017 GMC Sierra Denali, providing troubleshooting tips and maintenance advice to keep your truck riding smoothly.
Understanding the 2017 GMC Sierra Denali Air Suspension
Before troubleshooting, it's crucial to understand the system's components. The air suspension system on the 2017 Sierra Denali replaces traditional steel springs with air springs. These air springs are controlled by an air compressor, various air lines, and a sophisticated electronic control module (ECM). This system allows for adjustments to ride height and damping, optimizing comfort and handling based on driving conditions and load.
Key components include:
- Air Springs: These are the heart of the system, providing variable suspension stiffness and ride height.
- Air Compressor: This pumps air into the air springs to adjust ride height and maintain pressure.
- Air Lines and Fittings: These deliver compressed air to the air springs. Leaks in these lines are a common source of problems.
- Electronic Control Module (ECM): This computer monitors various sensors and controls the air compressor to maintain the desired ride height and damping.
- Height Sensors: These sensors constantly monitor the vehicle's ride height and send data to the ECM.
- Shock Absorbers: While not strictly part of the air system, they work in conjunction with the air springs to control suspension damping and movement.
Common 2017 GMC Sierra Denali Air Suspension Problems
Several issues can plague the 2017 GMC Sierra Denali's air suspension system. These include:
1. Low Ride Height or Sagging Suspension:
This is often the first sign of a problem. Several factors can cause this:
- Leaking Air Springs: A slow leak in one or more air springs will gradually cause the vehicle to sag.
- Leaking Air Lines: A leak in the air lines will prevent the system from maintaining proper pressure.
- Faulty Air Compressor: A failing compressor may not be able to maintain sufficient air pressure.
- ECM Malfunction: A problem with the electronic control module can prevent the system from functioning correctly.
2. Air Suspension Warning Light:
This light illuminates on the dashboard when the system detects a problem. Consult your owner's manual for specific codes associated with the warning light. Often, a diagnostic tool is required to read these codes and pinpoint the issue.
3. Unusual Noises:
Unusual noises, such as hissing sounds or knocking, can indicate a problem with the air springs, air lines, or compressor.
4. Rough Ride:
If the ride quality is significantly rougher than expected, it could be due to a faulty air spring, leaking air line, or a problem with the shock absorbers.
Troubleshooting and Maintenance Tips
- Regular Inspection: Regularly check the air lines and fittings for any signs of leaks or damage.
- Listen for Leaks: Listen carefully for any hissing sounds, especially when the system is cycling.
- Visual Inspection: Inspect the air springs for any visible damage or signs of wear.
- Check Air Pressure: While not easily accessible without specialized equipment, knowing the correct pressure range for your system can help identify potential issues. Consult your owner's manual.
- Professional Diagnosis: If you suspect a problem, take your vehicle to a qualified mechanic specializing in air suspension systems. Improper repair attempts can cause further damage.
- Preventative Maintenance: Following the recommended maintenance schedule outlined in your owner's manual is crucial for maintaining the longevity and proper function of the air suspension system.
Conclusion
The air suspension system on the 2017 GMC Sierra Denali significantly enhances the driving experience. However, understanding potential problems and practicing preventative maintenance are key to avoiding costly repairs. Regular inspection, prompt attention to warning signs, and professional service when needed will keep your Denali riding smoothly for years to come. Remember to always consult your owner's manual for specific maintenance and troubleshooting instructions.
