Mercedes-Benz C Class, E Class, GLC And 1 More Recall R/2021/304: The Belt Tensioner Arm May Have Been Manufactured With Borderline Tolerance, Who Is Affected And What To Do
- Low
- How serious
- 23 Sep 2021
- Launched
- 427
- vehicles in the UK
- SRPC2141
- Manufacturer’s campaign code
Mercedes-Benz recalled C Class, E Class, GLC and 1 more vehicles built between 9 January 2019 and 17 March 2021. The belt tensioner arm may have been manufactured with borderline tolerance. The dealer will replace the belt tensioner. You won't usually pay for it.1
What’s Wrong
The belt tensioner arm may have been manufactured with borderline tolerance.
DVSA's Original Wording
Concern: THE BELT TENSIONER ARM MAY HAVE BEEN MANUFACTURED WITH BORDERLINE TOLERANCE Defect: The belt tensioner arm may have been manufactured with borderline tolerance. Remedy: Replace the belt tensioner. Additionally check the v-ribbed belt on the affected vehicles and replace it if necessary.
Contains public sector information licensed under the Open Government Licence v3.0.
The Risk
The recall notice describes the concern as: the belt tensioner arm may have been manufactured with borderline tolerance.
The Fix
The dealer will replace the belt tensioner.
Are You Affected?
C Class, E Class, GLC and 1 more built between 9 January 2019 and 17 March 2021 may be included. Mercedes-Benz estimates 427 vehicles in the UK. Enter your registration to check, then confirm by VIN with Mercedes-Benz, because not every car in the date range may be included.
Which Car Is It?
Choose the make and model so we can match recalls to your car.
What To Do Now
- Check your car by registration above, then by VIN with Mercedes-Benz.
- Book with any franchised Mercedes-Benz dealer, quoting the campaign code SRPC2141 or the DVSA reference R/2021/304. See how to get a Mercedes-Benz recall fixed.
- Follow the letter's instructions until the repair is done. See can you drive a car with a recall?.
Related Recalls
| Launched | Vehicle and fault | Severity | Reference |
|---|---|---|---|
| CLS, E Class, GLCDrive shaft joint | Low | R/2026/148 | |
| GLEInstallation of the heat shield | Low | R/2026/326 | |
| E ClassCoolant pump control software | Low | R/2026/201 | |
| GLERear seat belt bolting | Urgent | R/2026/221 | |
| E ClassRouting of transmission wiring harness | Book soon | R/2025/534 |
This is one of 833 Mercedes-Benz recalls in DVSA’s data. The Mercedes-Benz recall launched before it was R/2021/309 on 20 Sep 2021, for the communications module might not meet specifications. The one launched after it was R/2021/313 on 4 Oct 2021, for changes to specific aspects of the engine control system calibration are required. You can also see every Mercedes-Benz recall, the Mercedes-Benz C Class recall history and all recalls launched in 2021.
Source: DVSA recall R/2021/304, launched 23 September 2021. Data updated 15 October 2026. How we grade urgency.
Sources
- The Code does not itself say repairs are free. GOV.UK guidance says "You will not usually have to pay for any repairs or parts under a safety recall." gov.uk Checked 15 Oct 2026.