300 Height Control & Air Suspension Problems Fix

I have some experience with suspension systems and encountered a similar issue on my 2019 Pacifica. The symptoms you describe match what I experienced, uneven ride height and malfunctioning leveling system. The root cause in my case was a faulty control rod connected to the leveling sensor. The load sensor was giving incorrect readings, causing the air suspension system to malfunction. After diagnosis, replacing the control rod and recalibrating the leveling sensor fixed the problem completely. The repair cost me 110€. This sounds very similar to your situation, but to provide more specific guidance, could you share: Have you noticed any air leaks or hissing sounds? Does the height variation change after the car sits overnight? Are all wheels affected or just specific corners? Any recent impacts or damage to the suspension components? The suspension issue could be caused by several components in the leveling system. While the control rod was the culprit in my case, your 300 might have different underlying problems. Getting these details would help identify if you are facing the same issue or something else in the air suspension system.

Thanks for the input. At 140686KM I am also seeing similar symptoms to what you described. The hissing sound is definitely present, especially when parked after a long drive. The rear passenger side seems most affected, staying lower than the other corners. The control module diagnostic check at my last service showed fault codes related to the air suspension system. The load sensor readings are inconsistent according to the scan results. I will have the control rod inspected based on your experience. Would you recommend checking the entire leveling system or just focusing on the control rod replacement first? The automotive suspension shop quoted 400€ for a full system diagnosis and potential repairs.

Based on the symptoms you described and my experience with the Pacifica, I would recommend starting with the control rod inspection and replacement rather than a complete system overhaul. The hissing sound and uneven rear passenger corner strongly point to a faulty control rod, just like in my case. The air suspension system relies heavily on accurate readings from the load sensor, and when the control rod malfunctions, it causes the exact ride height inconsistencies you are experiencing. The fault codes from your control module further confirm this diagnosis. After my control rod replacement, I did notice a few key improvements: The ride height stabilized within 24 hours, the control module warnings cleared, the bumpy ride quality disappeared, headlight alignment returned to normal. The 400€ quote seems high considering my repair cost. A focused repair targeting just the control rod and load sensor calibration should cost significantly less. The complete system diagnosis might be unnecessary unless the targeted repair fails to resolve the issue. Make sure whoever does the work recalibrates the ride height sensors after installation. My mechanic initially skipped this step, and the suspension issue persisted until proper calibration was performed.

I appreciate the detailed feedback. The hissing and control module diagnostic codes do match what you experienced. After getting the 400€ quote, I was concerned about potential overkill on repairs. Your experience with the control rod replacement sounds promising for my situation. Since we share similar symptoms with the height sensor malfunction and suspension behavior, I will focus on getting just the control rod and leveling sensor inspected first. The inconsistent load sensor readings from my scan also support this approach. The air suspension irregularities, especially on that rear passenger corner, have been quite annoying. Knowing that your targeted repair fixed both the ride height and headlight alignment issues gives me confidence to pursue the simpler fix first. I will insist on proper height adjustment calibration after the work is done. Will have the repairs scheduled this week and update once completed. Makes much more sense to try the control rod replacement before considering a full system overhaul. Thanks for helping narrow down the problem and potentially saving me some significant repair costs.