VW Caddy Air Suspension Failure & Troubleshooting Help

Having dealt with similar air suspension issues on my 2016 VW Passat, I can relate to your situation. The symptoms you describe match what I experienced, uneven ride height and error messages indicating suspension failure. After noticing air leaks and inconsistent shock absorber performance, I took it to a specialized workshop. They diagnosed a faulty air suspension valve in the rear right suspension system. The complete diagnostic and repair process took about 4 hours, costing 590€ including parts and labor. The fix involved: 1. Full system diagnostic scan 2. Pressure testing of all air lines 3. Replacement of the defective valve 4. Recalibration of the air suspension system Since the repair, the ride height has remained consistent and the error messages disappeared completely. To provide more specific advice for your case, could you share: Have you noticed any unusual noises when the suspension tries to adjust? Does the lean get worse overnight? Which specific error codes are you getting? Did the issue develop gradually or suddenly? These details would help determine if your issue matches what I experienced and whether you might be looking at a similar repair path.

Thanks for the detailed response. Yes, I hear a distinct hissing sound when the suspension tries to adjust, and the lean definitely gets worse after the car sits overnight. The error code displaying is P1577, which relates to air suspension malfunction. The suspension issue developed quite suddenly, maybe over 2-3 days. My car is still relatively fresh with only 17130km on the odometer and had its latest service just 2 months ago. Based on your experience, looks like I might be facing a similar repair path with the air valve. Did your repair come with any warranty on the parts?

Thanks for those additional details. The symptoms you're describing, especially the hissing sound and overnight sagging, are exactly what I experienced with my Passat. The P1577 error code is also the same one I encountered when my pneumatic suspension started failing. The repair work on my bellows valve came with a 2-year warranty on parts and labor. This was particularly reassuring given the complexity of the suspension system. My workshop explained that modern air suspension components are designed to last much longer, so failures at low mileage like yours often point to a defective part rather than wear and tear. After my repair, they recommended: Regular inspection of air lines for potential leaks, Keeping the suspension system at normal ride height during parking, Avoiding prolonged periods in raised position One tip from my experience: have them check all the air lines while they're working on it. In my case, they found a minor leak in another line that could have caused problems later. The additional inspection only added about 30€ to the total cost but prevented future issues. The complete fix restored proper ride height control and eliminated all error messages. It has been working flawlessly for 18 months now.

Based on your experience and thorough explanation, I'll definitely have my car checked at a specialized workshop. The matching error code P1577 and similar symptoms, especially the hissing sound and overnight sagging, make me confident its likely the same suspension failure issue you faced. Good to know about the 2-year warranty on the repair. With my low mileage, it does seem more like a defective part than normal wear. I appreciate the maintenance tips about proper suspension height during parking and regular inspections, these will be helpful going forward. I will ask the workshop to do that complete air line inspection you mentioned. The extra 30€ sounds worth it to catch any other potential issues while they are working on the pneumatic suspension system. Having a proper shock absorber function and consistent ride height is crucial for daily driving comfort. Will book an appointment tomorrow and request they start with checking the bellows valve and air lines. The 590€ repair cost you mentioned gives me a good baseline for what to expect. Thanks for sharing your experience, its helped me understand what I am dealing with.