Tapping noise but only when in gears
#1
Junior Member
Thread Starter
Tapping noise but only when in gears
I have a 2018 GLC 300 4matic and recently started hearing about this tapping noise. I was wondering if anyone has any suggestions on what the cause could be.
Some findings;
I can’t come up with anything. Any suggestions?
Some findings;
- Happens only when in gears. Nothing when stationary, even in high rpm
- More noticeable when driving back from work afternoon (on my way home from work). Worse when engine is warm? In mornings, either don’t hear it or it is really low, i can’t tell
- After 5th gear or so with higher speeds, I don’t hear it anymore. I would say noise is the most between 20-50 mph, not sure though
- As I drive for longer periods (20+ mins), the less the noise gets, but it is there, even at minimum
- Tried putting in neutral when cruising and the noise immediately goes away. Revving the engine when cruising on neutral does not produce this tapping noise at all. Absolutely no noise coming by revving the engine in neutral. It is very quiet and smooth
- Pretty much the noise follows the rpm. When transmission upshift, the noise stops between the shifting action and resumes with the new gear on
- When I let go of acceleration, the noise goes away
- Oil is at right level and I don’t have any codes when scanning
- Just for information; I had a transmission fluid change at official dealership back in July - around 7,000 miles ago. Not sure if I always had the noise and no idea when it started
I can’t come up with anything. Any suggestions?
Last edited by FreeWoRLD; 11-15-2023 at 12:19 AM.
#2
MBWorld Fanatic!
Originally Posted by FreeWoRLD
I have a 2018 GLC 300 4matic and recently started hearing about this tapping noise. I was wondering if anyone has any suggestions on what the cause could be.
Some findings;
I can’t come up with anything. Any suggestions?
Some findings;
- Happens only when in gears. Nothing when stationary, even in high rpm
- More noticeable when driving back from work afternoon (on my way home from work). Worse when engine is warm? In mornings, either don’t hear it or it is really low, i can’t tell
- After 5th gear or so with higher speeds, I don’t hear it anymore. I would say noise is the most between 20-50 mph, not sure though
- As I drive for longer periods (20+ mins), the less the noise gets, but it is there, even at minimum
- Tried putting in neutral when cruising and the noise immediately goes away. Revving the engine when cruising on neutral does not produce this tapping noise at all. Absolutely no noise coming by revving the engine in neutral. It is very quiet and smooth
- Pretty much the noise follows the rpm. When transmission upshift, the noise stops between the shifting action and resumes with the new gear on
- When I let go of acceleration, the noise goes away
- Oil is at right level and I don’t have any codes when scanning
- Just for information; I had a transmission fluid change at official dealership back in July - around 7,000 miles ago. Not sure if I always had the noise and no idea when it started
I can’t come up with anything. Any suggestions?
#3
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#4
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former- 10&14 ML BlueTecs, 20 GLE450 E-ABC, 15 Cayenne D, 17 Macan
Ask your dealer to mount some Chassis Ears to target the noise.
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FreeWoRLD (11-19-2023)
#5
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
I have a 2018 GLC 300 4matic and recently started hearing about this tapping noise. I was wondering if anyone has any suggestions on what the cause could be.
Some findings;
I can’t come up with anything. Any suggestions?
Some findings;
- Happens only when in gears. Nothing when stationary, even in high rpm
- More noticeable when driving back from work afternoon (on my way home from work). Worse when engine is warm? In mornings, either don’t hear it or it is really low, i can’t tell
- After 5th gear or so with higher speeds, I don’t hear it anymore. I would say noise is the most between 20-50 mph, not sure though
- As I drive for longer periods (20+ mins), the less the noise gets, but it is there, even at minimum
- Tried putting in neutral when cruising and the noise immediately goes away. Revving the engine when cruising on neutral does not produce this tapping noise at all. Absolutely no noise coming by revving the engine in neutral. It is very quiet and smooth
- Pretty much the noise follows the rpm. When transmission upshift, the noise stops between the shifting action and resumes with the new gear on
- When I let go of acceleration, the noise goes away
- Oil is at right level and I don’t have any codes when scanning
- Just for information; I had a transmission fluid change at official dealership back in July - around 7,000 miles ago. Not sure if I always had the noise and no idea when it started
I can’t come up with anything. Any suggestions?
#7
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
#10
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They definitely did not, but this was Carmax that I should have mentioned.
I have an extended warranty with them until 125,000 miles and I just wanted to bring the car to them in the first place.
Maxcare (Carmax extended warranty) covers MB delaerships as well, so that will be my next stop, whenever I get a chance.
I have an extended warranty with them until 125,000 miles and I just wanted to bring the car to them in the first place.
Maxcare (Carmax extended warranty) covers MB delaerships as well, so that will be my next stop, whenever I get a chance.
#11
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
They definitely did not, but this was Carmax that I should have mentioned.
I have an extended warranty with them until 125,000 miles and I just wanted to bring the car to them in the first place.
Maxcare (Carmax extended warranty) covers MB delaerships as well, so that will be my next stop, whenever I get a chance.
I have an extended warranty with them until 125,000 miles and I just wanted to bring the car to them in the first place.
Maxcare (Carmax extended warranty) covers MB delaerships as well, so that will be my next stop, whenever I get a chance.
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FreeWoRLD (01-11-2024)
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FreeWoRLD (05-21-2024)
#13
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FreeWoRLD (05-21-2024)
#14
A tapping noise that occurs only when your vehicle is in gear could indicate a few potential issues with the transmission, engine, or drivetrain. Here are some common causes to consider:
- Low Transmission Fluid: Low transmission fluid levels can cause irregularities in the operation of the transmission, leading to tapping or ticking noises. Check your transmission fluid level and top it up if it's low. If the fluid is significantly low, there might be a leak that needs to be addressed.
- Worn Transmission Components: Tapping noises in the transmission can also be caused by worn or damaged components such as gears, bearings, or synchronizers. If the transmission is old or has not been properly maintained, these parts may wear out over time and produce noise when the vehicle is in gear.
- Faulty Torque Converter: A malfunctioning torque converter can also produce tapping or ticking noises when the vehicle is in gear. Issues with the torque converter's internal components, such as worn bearings or damaged fins, can cause noise during operation.
- Engine Issues: Sometimes, tapping noises that occur only when the vehicle is in gear can be related to engine problems. This could include issues with the valvetrain, such as worn lifters, valves, or camshaft components. Low oil pressure or insufficient lubrication can also contribute to engine noise. FMWhatsApp
- Driveshaft or Axle Problems: Tapping noises in the drivetrain, particularly when the vehicle is in gear, could indicate issues with the driveshaft, CV joints, or axle shafts. Worn or damaged components in the drivetrain can produce noise as they rotate under load.
- Exhaust System Issues: Problems with the exhaust system, such as loose or damaged components, can sometimes cause tapping or rattling noises that are more noticeable when the vehicle is in gear and under load.
#15
Junior Member
Thread Starter
Thanks for your suggestion. I am curious if the prop shaft coupling stops turning the second you are in neutral (out of any gears)? I am asking this because the noise goes away immediately when I put it in neutral (when cruising). It also stops momentarily between shift changes. By the way, now the weather is warmer I don't even notice it and if I do, it is really low.
I haven't had a chance to take it to anywhere yet, but I will at some point, and I will make sure to update my post here.
I haven't had a chance to take it to anywhere yet, but I will at some point, and I will make sure to update my post here.