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Sorry i strip and rebuild a manual gearbox and a auto as well but the modern electronics is just way above my head ,this fault could even be the actual computer controlling the gearbox ,i have no idea so please consult a auto box expert
Hi Ernest, It would help us to know more about the type of vehicle your are referring to. Is it a manual or automatic box? Is it fitted into a small passenger vehicle (a car) or is it a commercial vehicle? Is it front wheel drive or rear? Is it a two by four or four by four? In the event of it being a four by four, is it full time or is it selectable? A humming from the gear box will usually become more pronounced in one particular gear. If that is the case, the noise usually denotes a problem with the roller needle bearings for that particular gear. If the noise is in all gears it usually means that the problem is with the lay shaft bearing or that the gear assembly has been damaged in some way. If it is front wheel drive, the same diagnosis will apply, but added to it can be a problem with the differential (which is housed in the same housing as the gearbox. If the vehicle has a manual box, the thrust bearing can also give a humming sound sometimes when the clutch is pressed or sometimes when released. The test for that is simple. Start the engine push the clutch pedal and listen for any change in the sound. If the noise becomes more pronounced when the pedal is pressed the problem will likely be with the thrust bearing. If however the noise reduces or disappears with the same action, the problem is more likely to be with the input shaft bearing of the box. (The spigot shaft which is driven by the clutch plate or torque converter. If the vehicle is automatic The same may apply, or there may be a problem with the oil pump inside the box. These are just a few of the possible diagnostics for the limited info you have provided. The more you explain the more we can help! regards John
When does the noise occur, while driving only, or driving and idle, in gear, or in neutral and park? If it occurs all the time (while driving and at a stand still in cold weather) it could be the fuel pump. If it occurs only while driving, it may be a wheel bearing. Describe the noise (humming, grinding, whirring, etc), and what is the mileage on the Pilot? Answer my questions so I can fine tune my answer. Thanks!
Have you checked that the noise is not tyre noise?
Interchange the wheels front to rear (or left to right) to see if it has any effect on the noise.
Only do the test below if the car is securely chocked so as not to move, take great care not to contact moving parts!
Securely jack both the car drivewheels off the ground, then 'drive' the vehicle through through the problem drive speed/gears while listening for the noise. If the noise occurs under these circumstances you may be able to further localise the source by listening (very carefully!)with a short hose pipe held to the ear.
Well, if the transmission seems to be okay , The timing belt or chain is most likely the noise based on the age of the vehicle. The tech you took the vehicle to should be able to pin point the noise with stethascope ears.