Mercedes-Benz · Known Issues

2021 Mercedes-Benz V-Class Problems: 2 Issues Every Owner Should Know

2021 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated June 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Mercedes-Benz V-Class has 2 documented known issues, with 1 rated critical. The most serious is OM654 Coolant Pump Vacuum-to-Coolant Leak (Safety Recall) ($0-$0 repair). Across all issues with published estimates, repair costs range from $80 to $600. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Mercedes-Benz V-Class problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Mercedes-Benz V-Class has 2 documented issues. The most frequently reported are: OM654 Coolant Pump Vacuum-to-Coolant Leak (Safety Recall), Electric Sliding Door Failure (Worn Guide-Rail Cable/Gear Mechanism). Of these, 1 is rated critical and should be addressed promptly.

Is the Mercedes-Benz V-Class reliable?

The 2021 Mercedes-Benz V-Class has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: OM654 Coolant Pump Vacuum-to-Coolant Leak (Safety Recall). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Mercedes-Benz V-Class problems?

Repair costs for known Mercedes-Benz V-Class issues range from $0 to $600, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, OM654 Coolant Pump Vacuum-to-Coolant Leak (Safety Recall), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2019-2021 Mercedes-Benz V-Class OM654 Coolant Pump Vacuum-to-Coolant Leak (Safety Recall)?

On later W447 V-Class fitted with the OM654 2.0L diesel, the coolant pump is vacuum-controlled. A leak can develop between the vacuum system and the coolant circuit, allowing coolant to be drawn into the vacuum side. This can compromise engine cooling/operation. Mercedes issued a… Repairs typically run $0-$0. Severity: high.

What is the 2014-2022 Mercedes-Benz V-Class Electric Sliding Door Failure (Worn Guide-Rail Cable/Gear Mechanism)?

The power sliding side door on W447 V-Class/Vito/Viano relies on a cable-and-pulley drive running in a guide rail in the door sill. The plastic gears, pulley and the drive cable wear, fray or strip, so the door stops opening/closing automatically, jams part-way, or makes grinding… Repairs typically run $80-$600. Severity: medium.

2021 Mercedes-Benz V-Class Problems: 2 Issues Every Owner Should Know

All 2 Known Issues

2019-2021 Mercedes-Benz V-Class: OM654 Coolant Pump Vacuum-to-Coolant Leak (Safety Recall)#

Common Symptoms

How to Fix

Research This Issue

2014-2022 Mercedes-Benz V-Class: Electric Sliding Door Failure (Worn Guide-Rail Cable/Gear Mechanism)#