Mercedes-Benz C Class, CLS, E Class And 5 More Recall R/2021/438: Coolant Pump Might Have A Leakage Between The Vacuum System And The Coolant Circuit, Who Is Affected And What To Do
- Low
- How serious
- 21 Jan 2022
- Launched
- 35,624
- vehicles in the UK
- SRPC2157
- Manufacturer’s campaign code
Mercedes-Benz recalled C Class, CLS, E Class and 5 more vehicles built between 4 April 2017 and 12 October 2021. With a Diesel engine the coolant pump which is controlled by vacuum might have a leakage between the vacuum system and the coolant circuit. The dealer will update the software of the coolant pump and replace the electrical switch valve on the affected vehicles. You won't usually pay for it.1
What’s Wrong
With a Diesel engine the coolant pump which is controlled by vacuum might have a leakage between the vacuum system and the coolant circuit.
DVSA's Original Wording
Concern: COOLANT PUMP MIGHT HAVE A LEAKAGE BETWEEN THE VACUUM SYSTEM AND THE COOLANT CIRCUIT Defect: On certain vehicles with a Diesel engine the coolant pump which is controlled by vacuum might have a leakage between the vacuum system and the coolant circuit. Remedy: Update the software of the coolant pump and replace the electrical switch valve 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: coolant pump might have a leakage between the vacuum system and the coolant circuit.
The Fix
The dealer will update the software of the coolant pump and replace the electrical switch valve on the affected vehicles. The fix is a software update, which usually takes under an hour at the dealer.
Are You Affected?
C Class, CLS, E Class and 5 more built between 4 April 2017 and 12 October 2021 may be included. Mercedes-Benz estimates 35,624 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 SRPC2157 or the DVSA reference R/2021/438. 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 | |
| E ClassCoolant pump control software | Low | R/2026/201 | |
| S ClassWindshield bonding | Low | R/2026/191 | |
| G ClassWheel bolt variant | Book soon | R/2026/140 | |
| 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/2021/437 on 14 Jan 2022, for locking pawl spring of the left hand side door locks might not be greased correctly. The one launched after it was R/2021/444 on 28 Jan 2022, for power supply connection of power steering might have been contaminated with adhesive. You can also see every Mercedes-Benz recall, the Mercedes-Benz C Class recall history and all recalls launched in 2022.
Source: DVSA recall R/2021/438, launched 21 January 2022. 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.