What Causes the Reversing Noise in Passat?
2 Answers
The causes of reversing noise in Passat are as follows: Noise occurs only at idle or low speed: Possible causes include: excessive clearance between piston and cylinder wall; overly tight piston pin assembly or connecting rod bearing assembly; excessive clearance between tappet and its guide hole; wear on the camshaft profile; sometimes, a loose starter clutch causing pulley noise (especially noticeable during speed changes). Irregular noise at a certain speed, with brief sounds during rapid deceleration: Possible causes include: cracked camshaft timing gear or loose fixing nut; broken crankshaft; loose piston pin bushing; excessive axial clearance of camshaft or loose camshaft bushing. Noise appears during rapid acceleration and persists at high speed: Possible causes include: loose connecting rod bearing, melted or mismatched bearing shell causing rotation; loose crankshaft bearing or melted bearing shell; broken piston pin; broken crankshaft.
It's quite common for the Passat to make abnormal noises when reversing. I've driven many similar models and found that most cases are related to the braking system. The brake discs and pads bear different pressures when reversing, and if the brake pads have impurities or uneven wear, they tend to squeak. Additionally, loose suspension components like ball joints or links can also produce sounds when rotating in reverse. My car once had this issue and cost a few hundred dollars to fix. When checking, try putting the car in reverse to listen for the source of the noise. If it's near the rear wheels, it's likely the brakes; if the sound comes from under the chassis, it might be a suspension problem. I recommend going to a repair shop as soon as possible to have it inspected with a lift. Delaying could damage more parts and affect driving safety. Don’t forget to regularly clean brake dust during routine maintenance.
