2008 Mercedes-Benz S550 Electrical system Problems
- Complaints
- 4about this part
- Share
- 21%of 19 total for the year
- Median mileage
- 63,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the electrical system of the 2008 Mercedes-Benz S550, 21% of the 19 complaints for this model year. Where a mileage was given, the median is 63,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Even change to new tires, the air pressure up to 37 and always after 1 week or so, down to 33, complain and change tire and still have the same result. You could only check the tire pressure after you run for a while. Massage chair, after operation and all the sudden it stop. Clock in the cabin doesn't change even you set it up and the internal said the right time and the front doesn't change”
NHTSA complaint #11292448, filed 2020-01, 69,000 miles“The contact owns a 2008 Mercedes-Benz S550. The contact stated while driving 40-50 MPH, the vehicle was shuddering intermittently. The contact stated that the failure recurred while at a complete stop. The check engine warning light was illuminated. The contact stated that the failure had been recurring intermittently. The vehicle was taken to an independent mechanic, where it was diagnosed that the wiring harness was causing an engine misfire. The mechanic related the failure to an unknown recall. The dealer was notified of the failure. …”
NHTSA complaint #11577423, filed 2024-03, 40,000 miles“The contact owns a 2008 Mercedes-Benz S550. The contact stated while driving 35-40 MPH, the message SAFETY was temporarily displayed on the instrument panel. Additionally, the contact stated while starting the vehicle on several occasions, the message SAFETY was displayed on the infotainment system screen. The check engine warning light was illuminated, and the messages Active Head Lamp Inoperative and Service Required. Do Not Shift Gears were displayed. The contact also stated that upon shifting into drive (D), the gear shift indicator displayed that the transmission was in park (P). …”
NHTSA complaint #11541256, filed 2023-08, 176,310 milesRelated service bulletins
- 11033185May 26, 2026Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the message "SOS - service not activated" appears on the…
- 11015640Mar 5, 2025Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver, or interference/background noises are audible to the called party…
- 11008091Sep 28, 2024Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver, or interference/background noises are audible to the called party…
- 10186141Dec 10, 2020NTG5.5: Incorrect time shown on instrument cluster, COMAND display, and analog clock
- 10135604Mar 31, 2015Vehicle cannot be opened via Keyless-Go and radio remote control
- 10165854Jul 12, 2014The trunk lid sometimes does not open completely and does not close (completely). This complaint is accompanied by the following symptoms: - Illumination of the trunk lid control…
- 10166098Jul 10, 2014Multicontour system fails during air release procedure. The system becomes operational again after an ignition change. Fault code 9E8900 is stored.
- 10165853Jul 3, 2014When on rough roads and with side loads applied to the center console (leg support) cracking noise may occur in the transition between the instrument panel and the center console.
- 10167006Feb 12, 2014Engine diagnosis warning lamp active. Fault code 20BE1B and/or 20BD1B (The heating element of the AdBlue tank has a malfunction) is logged in the Blue-Tec control unit.
- 10167572Jul 3, 2013If it is necessary to replace an HV battery, the return will only be accepted with the filled-out ?Analysis Sheet for Transportability of High-Voltage Batteries Form? accompanied…
Electrical system: other model years
Other parts of the 2008 Mercedes-Benz S550
4 complaintsFuel system
3 complaintsEngine
2 complaintsEquipment
2 complaintsSuspension
2 complaintsTransmission and drivetrain
2 complaintsAir bags
1 complaintsBrakes
1 complaintsOther or unknown
1 complaintsSeats
1 complaintsVehicle speed control
1 complaintsWheels
1 complaints
← All problems reported for the 2008 Mercedes-Benz S550
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology