Tl* the contact owns a 2005 Mercedes sl500. The contact stated that the ignition switch was faulty and caused multiple malfunctions in the vehicle. The vehicle was taken to the dealer where it was diagnosed that the battery needed to be replaced. The battery was replaced however, the failure persisted. The manufacturer was contacted about the failure. The failure mileage was 9,000 and the current…
2005 Mercedes-Benz SL-Class electrical problems
severe 5 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
5
Recalls
0
Avg fix
$850
1crash
1fire
1injury
When does it fail?
Of the 5 electrical complaints filed for the 2005 Mercedes-Benz SL-Class, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 5 model years of Mercedes-Benz SL-Class we track for electrical problems, this one carries the most owner complaints on file — 5.
No new NHTSA electrical complaint has been filed on this vehicle in over 12 years — the issue may be aging out of the active population.
What owners are reporting 2 most recent
Tl* the contact owns 2005 Mercedes benz sl500. The contact stated that the whole right side of the vehicle trunk caught on fire while the vehicle was parked. The contact stated that the fire started in the upper right front area of the trunk where they were wires and saw sparks. The contact stated that the fire went out on its own because there was no oxygen. The vehicle was not taken to a dealer…
Had electrical trouble with your 2005 Mercedes-Benz SL-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2005 Mercedes-Benz SL-Class?
It's a meaningful issue. 5 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Based on the 5 complaints filed, electrical issues most often appear around 37,646 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Mercedes-Benz/SL-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.