Mercedes-Benz S Class Recall R/2021/309: The Communications Module Might Not Meet Specifications, Who Is Affected And What To Do
- Low
- How serious
- 20 Sep 2021
- Launched
- 339
- vehicles in the UK
- SRPC2145
- Manufacturer’s campaign code
Mercedes-Benz recalled S Class vehicles built between 20 June 2020 and 2 July 2021. The communication module might not meet specifications. The dealer will update the software including a correct configuration of the communication module on the affected vehicles. You won't usually pay for it.1
What’s Wrong
The communication module might not meet specifications.
DVSA's Original Wording
Concern: THE COMMUNICATIONS MODULE MIGHT NOT MEET SPECIFICATIONS Defect: The communication module might not meet specifications. Remedy: Update the software including a correct configuration of the communication module on the affected vehicles.
Contains public sector information licensed under the Open Government Licence v3.0.
The Risk
The recall notice describes the concern as: the communications module might not meet specifications.
The Fix
The dealer will update the software including a correct configuration of the communication module on the affected vehicles. The fix is a software update, which usually takes under an hour at the dealer.
Are You Affected?
S Class built between 20 June 2020 and 2 July 2021 may be included. Mercedes-Benz estimates 339 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 SRPC2145 or the DVSA reference R/2021/309. 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 |
|---|---|---|---|
| S ClassWindshield bonding | Low | R/2026/191 | |
| AMG GT, GLC, S Class, SLProcessor Starter/Generator | Urgent | R/2025/124 | |
| AMG GT, C Class, CLE, E Class and 5 moreSystem protection | Low | R/2024/130 | |
| A Class, C Class, CLA(117), GLA and 2 moreOn affected vehicles the panel located between the windshield and the panoramic sunroof might not have been bonded correctly during a prior service repair | Low | R/2024/024 | |
| S ClassA 12V ground connection bolt in the boot might not meet specifications | Low | R/2023/259 |
This is one of 833 Mercedes-Benz recalls in DVSA’s data. The Mercedes-Benz recall launched before it was R/2021/308 on 20 Sep 2021, for the communication module might not meet specifications. The one launched after it was R/2021/304 on 23 Sep 2021, for the belt tensioner arm may have been manufactured with borderline tolerance. You can also see every Mercedes-Benz recall and all recalls launched in 2021.
Source: DVSA recall R/2021/309, launched 20 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.