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Humming sound from Fit Hybid 2018


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Supercharged

General info

7 Speed Dual Clutch gearbox

1.5L engine with Hybrid

4 year old

55k Kms

Servicing done every 10K - Engine oil+filter

Other major fluids every 20K - Brake, clutch, gearbox, coolant

Symptoms:

I am experiencing a strange humming sound from the front of the car which gets louder as the speed increases.

Recently changed to a set of Goodyear Assurance Triplemax 2 from JB (early Oct) - Tyres are relatively quiet, after about 3 weeks and 800kms suddenly the humming sound surfaced, suspected tyre run-in and got noiser, hence swop front to rear and the sound persisted.

Swoped 4 tyres with my friend's Bridgestone RE004(20k km) and the sound is still present. Verdict - Not tyres.

Did some running tests with the following results:

Car will swop between engine and EV battery mode during cruising - in both modes - sound persisted.

While humming is present - shifted to Neutral gear to coast - sound persisted.

My mechanic (not PI workshop) suspects the noise is coming from the gearbox main shaft bearing as it is constantly in motion even if the gears are not engaged.

I would like to seek some advise on the possible cause of this noise before I seek a second opinion and possibly try to claim warrantly for any premature wear from my PI.

🙂 Thank you very much in advance 🙂

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Supersonic
(edited)

Humm, could b worn out wheel bearings. My previous car got e humming sound u mentioned, low spd no sound, at ard 60-70km/h e sound starts and gets louder as e spd increase.

Edited by zipping
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Twincharged
8 minutes ago, zipping said:

Humm, could b wheel bearings

If it is wheel bearings, it won't hum when stationary.

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Supercharged

Forgot to mention that we have troubleshooted and checked all 4 wheel bearing and all fine

Although there is feedback on Honda Fit having many wheel bearing issues, mainly rear, but for my case, not wheel bearings.

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Supersonic
2 minutes ago, BoneStock said:

@Wildfaye29 when you shift to neutral does the sound become softer and frequency reduced?

 

Based on your mileage it is unlikely to be wheel bearing.  More likely to be alternator.

I suspect its this too. 

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Supercharged

@BoneStock

3 minutes ago, BoneStock said:

@Wildfaye29 when you shift to neutral does the sound become softer and frequency reduced?

 

Based on your mileage it is unlikely to be wheel bearing.  More likely to be alternator.

This Honda hybrid does not have any alternator. Affirmative.

The sound in neutral is similar loud.

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Twincharged
1 hour ago, Fitvip said:

If it is wheel bearings, it won't hum when stationary.

He never said it happen when stationary

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1 hour ago, Wildfaye29 said:

Forgot to mention that we have troubleshooted and checked all 4 wheel bearing and all fine

Although there is feedback on Honda Fit having many wheel bearing issues, mainly rear, but for my case, not wheel bearings.

my last car same humming sound[drivingcar]

spend a big bomb at 6 diff WS

 

 

 

in the end :slow:

 

 

sound is caused by brake dust build up 

 

 

wah piang eh really bang balls :a-bang:

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Supercharged
15 minutes ago, Beregond said:

Check your belt tensioner? 

Try off and on the the ac see any different

During drive. On n off Air-con same sound.

No alternator. No drive belts.

Air con runs via electric and partially powered by hybrid battery. 

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Supercharged

@Inlinefour 

11 minutes ago, Inlinefour said:

my last car same humming sound[drivingcar]

spend a big bomb at 6 diff WS

 

 

 

in the end :slow:

 

 

sound is caused by brake dust build up 

 

 

wah piang eh really bang balls :a-bang:

Exactly what I dont one to get into.

 

  • Sad 1
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