Home · 2021 Mercedes-benz S-class Phev · Complaints
These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.
3 of 33 complaints match · Engine · clear filters
The vehicle lost acceleration and the check engine light came on. I took the vehicle to Mercedes dealership. They quoted that the Camtronic actuator has failed and needs to be replaced. Cost $9000. I have now seen online a recall for 2021 mercedes s580's for CAMTRONIC actuator failure issue. However- my VIN is not included in the recall. Please advise what I should do.
NHTSA ODI 11736544
Similar to recall campagn #2017020018 or 17V-078. My car may have a damaged steering column-mounted shift lever module. If the internal circuit board is damaged, moving the shift lever will not select a transmission gear. Both the auto-P function and automatic parking brake will continue to operate as intended and prevent the vehicle from moving forward or rearward. The problem could also be the Mercedes Benz Intelligent Servo Module(ISM) module installed on the transmission side. Brought my car to dealer to fix, the 1st time on 4/14/2023 they simply replaced 48V battery. Today 6/19/2023, the same issue happens again.
NHTSA ODI 11527740
Background: This is a V-8, gas vehicle.The 12-volt battery gives CRITICAL CHARGE notifications constantly. Incident: Dry pavement, 400-mile, January winter night, highway driving in Wisconsin Northwoods at posted 70 mph; some with cruise control, some without cruise control. Seat belt was in use. On four occasions, car independently, without any warning, dropped from 70 mph to 35 mph, projecting me forward. No reduction in speed signage No small town drive through. With car and semi-truck traffic behind me, luckily no rear end collisions, injury or death occurred. During dealership repair service 12/09/2021 - 12/17/2021, along with mailed pending recall from manufacturer for ENGINE CONTROL SOFTWARE UPDATE, was told December 28, 2021 it would occur. When car returned for service on 01/18/2022 (and is still in for service today - 01/26/2022), I was told 01/14/2022 was the update release. I have not received any updated manufacturer notifications. Dealership (Illinois) says CONTROL MODULE on order from West Coast. (Photo - Portion of text response from Dealership Service Writer on 01/26/2022 is attached.) Dangerous vehicle. This newly designed model has engineering problems. Should not have been released to sales market. Numerous ELECTRICAL Problems have occurred since my August 5, 2021 purchase.
NHTSA ODI 11449057
Working with the data? Download all 33 complaints as CSV · fetched from NHTSA July 20, 2026