On November 28, 2025, I experienced a vehicle fire in my Mercedes 2020 Sprinter 2500 4WD van. The van engine was on and idling while heating up with the van heater blower on level 6 (out of 7). After about 45 minutes, I saw a haze first and then smelled smoke. Unsure of the source, I turned the vehicle off and exited with my dog. I opened the hood to look for smoke in the engine bay. No smoke…
2020 Mercedes-Benz Sprinter electrical problems
severe 14 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
14
Recalls
0
Avg fix
$850
1fire
What stands out
Of the 4 model years of Mercedes-Benz Sprinter we track for electrical problems, this one carries the most owner complaints on file — 14.
The failure pattern owners describe
The 2020 Mercedes Sprinter has a cluster of electrical issues that go beyond typical wear. Most prominent is the EIS (Electronic Ignition System) module design flaw: it's mounted under the driver dash with the connector pointing straight up, positioned right where windshield condensation and spilled drinks from the dashboard cupholder can drip directly into it. Multiple owners report the module shorts out and leaves the van dead on the road, requiring towing. Mercedes knows about it—they issued a $20 plastic bag cover—but refuse preventative repairs, treating it as an owner problem only after failure.
The engine wiring harness rubs against engine components as installed from the factory, abrading the protective cover and creating short circuits that stall the engine unexpectedly on the highway. Mercedes engineers in Germany confirmed this as a known, ongoing problem.
Owners also report instrument cluster blackouts with no warning, rearview camera failures despite recall campaigns, ADAS system failures (cruise control, collision avoidance, emergency braking) that recur even after multiple component replacements, and a fire that ignited under the driver seat while idling with the heater blower on high. Dashboard design puts the cupholder directly above a vent leading to the starter module—spilling liquid there shorts it out. Front passenger wiring harnesses pinch and sever under the seat, lighting the airbag warning.
Failure modes owners describe
EIS (Electronic Ignition System) module moisture ingress and corrosion
The EIS module is mounted under the driver-side dashboard with the electrical connector pointing upward. This design allows liquids spilled from the dash cupholder and windshield condensation to drip directly into the connector, causing short circuits and corrosion. Once shorted, the vehicle becomes inoperable and requires dealer towing. Mercedes issued a temporary plastic bag cover (part number A 638 546 00 35) but refuses preventative repair, only addressing failures after they occur.
When: Multiple narratives reference design affecting 2019+ models; failures reported as occurring after temperature changes and condensation buildup
Symptoms owners cite: Vehicle becomes completely inoperable; Unable to shift gears; Connector corrosion from condensation or spilled liquids; Intermittent electrical shorts
Repairs/costs cited: EIS module replacement costs $1,800+. Temporary cover (part A 638 546 00 35) available for $20 but not widely distributed or mandatory.
Recalls/TSBs owners mention: Mercedes issued service bulletin LI54.21-N-069524 with temporary plastic bag solution. Refuses preventative repair or warranty coverage, treating failures as owner responsibility post-occurrence.
Engine wiring harness chafing and abrasion
Factory harness installation rubs against engine components, causing the protective cover and wiring to abrade. This creates electrical sensor short circuits and unexpected engine shutdowns while driving. Mercedes technicians and engineers in Stuttgart have confirmed this as an ongoing problem in Sprinter vans, with potential for rear-end collisions from unplanned stalls.
When: Can occur at various mileages; one narrative reported at approximately 11,000 miles
Symptoms owners cite: Engine suddenly stalls or stops while driving; Check Engine light illumination; Electrical sensor short circuits; Partial restart capability; Difficulty starting engine with RPM capped below 750
Codes mentioned: Electrical sensor short circuit codes identified via OBD scanner
Repairs/costs cited: Chaffed harness requires complete replacement. One owner received estimate of nearly $6,400 for harness replacement on vehicle under 11,000 miles. Specialist diagnosis available but dealer confirmation and warranty coverage uncertain.
Recalls/TSBs owners mention: MB engineers in Stuttgart Germany have acknowledged the defect. No recall issued; manufacturer defers to dealer diagnosis and discretionary warranty decisions.
Instrument cluster and display blackouts
The instrument cluster loses functionality with the screen going completely blank, eliminating access to GPS, entertainment, vehicle information, and critical gauges. No warning lights precede these failures.
When: Reported at approximately 11,000 miles on 2020 model
Symptoms owners cite: Screen goes blank; Loss of dashboard display functionality; No GPS, entertainment, or vehicle information available; No warning lights before failure
Codes mentioned: NHTSA Campaign Number 23V204000 (Electrical System)
Repairs/costs cited: One owner reported complete dashboard rewire by dealer in 2021 on original vehicle; issue recurred later
Recalls/TSBs owners mention: NHTSA Campaign 23V204000 exists for this electrical system issue.
Under-seat electrical fire hazard
Vehicle fire ignited under the driver-side seat while the engine was idling with the heater blower running at high setting (level 6 of 7) for approximately 45 minutes. Owner detected smoke and flames beneath the seat and extinguished the fire with a portable fire extinguisher within 20-25 seconds. No warning signs or dashboard messages preceded the fire. The owner attributes the cause to sustained high-speed blower operation, but the underlying electrical fault remains under investigation.
When: Reported November 28, 2025, with no mileage specified
Symptoms owners cite: Haze visible before flames; Smoke smell; Flames visible under driver seat; No dashboard warning messages; No engine bay smoke
Repairs/costs cited: Fire was extinguished on-site by owner with portable fire extinguisher. Vehicle under investigation by MB USA and insurance company (Progressive). Owner notes vehicle has had spotty electrical wiring history with complete rewiring by dealer in 2021.
Recalls/TSBs owners mention: Incident under investigation with MB USA and insurance company.
Rearview camera intermittent failure
The rearview camera fails to display an image when the vehicle is placed in reverse. The infotainment screen shows a black area with a camera icon and a line through it, indicating camera malfunction. Failures occur intermittently and recur on multiple occasions.
When: One narrative reported at 51,000 miles; another reports recurring failures
Symptoms owners cite: No rearview image displayed in reverse; Black screen with disabled camera icon on infotainment; Intermittent failures occurring multiple times; No warning lights illuminated
Codes mentioned: NHTSA Campaign Number 21V411000 (Electrical System, Back Over Prevention)
Repairs/costs cited: One vehicle was not repaired; dealer unable to identify cause. Parts may not be readily available for recall repairs.
Recalls/TSBs owners mention: NHTSA Campaign 21V411000 exists for this issue, but some vehicles reported as not included in recall. Parts distribution for recall delayed past reasonable timeframe per one complaint.
Advanced driver assistance system (ADAS) failures after moisture exposure
After inclement weather, cruise control, Forward Collision Avoidance, and Automatic Emergency Braking features fail to operate. Problems are intermittent, with features intermittently returning to normal operation after vehicle restart. Multiple dealers replaced camera, sensors, and other unspecified parts without resolving the failure.
When: Reported at approximately 10,000 miles after inclement weather
Symptoms owners cite: Cruise control malfunction; Forward Collision Avoidance failure; Automatic Emergency Braking feature failure; Intermittent operation after restart; Recurrent failures despite multiple parts replacements
Repairs/costs cited: Camera, unknown sensors, and other unknown parts replaced at dealer; failure persisted
Recalls/TSBs owners mention: No manufacturer notification recorded for this complaint.
Starter module short circuit from spilled liquids
The dashboard cupholder is positioned directly above a vent that opens to the starter electrical module and circuit board. The cupholder is shallow and unstable. When a spill occurs (reported as accidental coffee spill), liquid flows directly through the vent into the starter module, causing it to short circuit and strand the vehicle.
When: Reported incident timing not specified
Symptoms owners cite: Starter module short circuit after liquid spill; Vehicle unable to start for extended period (over one hour reported); Once restarted, vehicle would not turn off, requiring continuous starter button pushing for 20 minutes to shut down
Repairs/costs cited: Owner repaired at own expense; repair costs not specified
Front passenger seat wiring harness pinching and severing
The wiring harness under the front passenger swivel seat becomes pinched and severed, triggering the airbag warning light. Owner repaired at own expense, though a recall exists (21V410000) for the same issue.
When: Timing not specified; vehicle is 2020 model
Symptoms owners cite: Airbag warning light illumination; Severed wires under passenger seat
Codes mentioned: Airbag warning light
Repairs/costs cited: Owner paid for repair out-of-pocket. Recall 21V410000 addresses same issue but owner's vehicle not included.
Recalls/TSBs owners mention: NHTSA Campaign 21V410000 exists for wiring harness issues under passenger seats, but not all affected vehicles included.
Cold start failures
Vehicle requires multiple attempts to start, with intermittent cold start failures occurring occasionally. Failures are intermittent in nature.
When: Reported on 2020 model; mileage approximately 11,000
Symptoms owners cite: Difficulty starting engine; Multiple start attempts required; Intermittent failures
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
Here's what I wrote: The 2019+ Mercedes Sprinter EIS (Electronic Ignition System) module is bolted under the driver side dash board to the base of the A pillar where it meets with the firewall. The electrical connector of the module is pointing straight up - this is an issue because any liquids that might spill on the dash (dash cupholder) or any humidity from windshield interior condensation…
Mercedes has a design and installation flaw for the EIS Connector. Its location under the wheel by the metal wall allows for condensation to directly be absorbed into the connector causing corrosion. Once corrosion happens, the van becomes inoperable as the driver cannot shift gears and the van must be towed to the nearest Mercedes dealership. This happens often to vans built after 2019 due to a…
Had electrical trouble with your 2020 Mercedes-Benz Sprinter?
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 2020 Mercedes-Benz Sprinter?
It's a meaningful issue. 14 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 14 complaints filed, electrical issues most often appear around 19,300 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/2020/Mercedes-Benz/Sprinter.
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.