Answering questions about the 2021 Renault Koleos's usage ：Postivani nadam se da ce te mi vi reci nesto vise o mome problemu,kupio sam Renault Koleos 2021godina,50.000Km,prije mijesec dana mi se pocelo cuti neko HUKANJE,kada kreces na 2200-3000 obrtaja zacuje se to Hukanje,te uz opretecenje uz uzbrdicu pri manjim obrtaji,a sad se pocelo cuti i kad je auto na cca 85-95 na sat na 3000 kad ga ides stisnut napravi taj zvuk,i auto kad das gas on se cuje al ubrzanje neide sa zvukom motora.Dali mozete naslutiti dali je vezano za Gitribu.Mamic Dinko.lp
It sounds like your 2021 Renault Koleos (50,000 km) is experiencing a humming or droning noise at certain RPMs (2200-3000) and under load, such as uphill driving. Additionally, you're noticing that when you press the accelerator at around 85-95 km/h (3000 RPM), the noise appears, but acceleration does not match the engine sound.
Possible Causes:
Transmission (Gearbox) Issues:
If the noise is coming from the transmission and acceleration is not responding as expected, there could be an issue with the CVT (Continuously Variable Transmission), common in Renault Koleos models.
Signs of CVT belt slippage or wear can cause increased engine noise without a corresponding increase in speed.
Check if the transmission fluid level and quality are normal. Dirty or low fluid can cause slippage and whining/humming noises.
Wheel Bearings or Drivetrain Issues:
A humming noise that gets louder with speed could be due to worn wheel bearings or an issue with the driveshaft or CV joints.
Try checking if the noise changes when turning-if it does, wheel bearings might be the culprit.
Turbocharger or Exhaust Leak:
If your Koleos has a turbo, a whining or droning noise under acceleration could indicate a turbocharger issue or an exhaust leak before the catalytic converter.
A leaking turbo hose can cause a similar sound and reduced acceleration.
Engine Mounts or Resonance Issues:
A loose or damaged engine mount might cause a droning noise at specific RPMs.
A failing harmonic balancer or resonance issue in the exhaust system could also cause a humming sound.
Recommended Actions:
✅ Check Transmission Fluid – If low or dirty, replace it.
✅ Test Acceleration Behavior – If the engine revs but the car doesn't respond well, it may be CVT slippage.
✅ Inspect Wheel Bearings & Drivetrain – A mechanic can check for play in the bearings or driveshaft.
✅ Look for Exhaust Leaks – Check turbo hoses and the exhaust system for leaks.
Next Steps:
Since your Koleos is fairly new (2021, 50,000 km), it might still be under warranty. If possible, take it to a Renault service center for a diagnostic check. An OBD-II scan may also reveal transmission-related error codes.
