P0299 Turbo Under Boost Code in Kia Sportage: Troubleshooting When Towing a Caravan
I'm experiencing a recurring issue when towing a caravan. During part of the journey to my destination or on the return trip, the engine starts running sluggishly, especially when accelerating uphill. At that point, the Engine Management light begins flashing and the vehicle enters limp mode. After a short period, the warning light stops flashing and the engine returns to normal operation—sometimes even performing better than before. The diagnostic check revealed fault code P0299: Turbo Under Boost. The issue appears intermittently; after one or two days, the code clears and the vehicle runs normally until the next towing trip. I've taken the car to both the original garage where it was purchased and to the official Kia main dealership twice, but no permanent solution has been found. Any advice or technical insights on how to diagnose or fix this P0299 turbo under boost issue in a 2006 Kia Sportage would be greatly appreciated.
Hi there.\nThis problem occurs specifically under heavy load conditions, such as when towing. Have you noticed any unusual noises, changes in engine performance, or excessive smoke coming from the exhaust during these situations? While power loss is already known, additional symptoms could help pinpoint the issue.\nDo you have access to live data monitoring tools—such as boost pressure and air mass flow sensors—to check real-time values while towing? This information may assist in diagnosing whether the turbocharger or associated systems are malfunctioning.