Controls on steering column periodically do not work. While most of these are convenience items, the horn also did not work. Happened 4 times--12/16 driving to work; 12/'20 driving to and from dulles airport; 12/26 in the morning. Each time the temperature was below 30 degrees f. Dealer serviced vehicle on 12/22--said wiring was repaired but experienced same problem again on 12/26.…
2005 Mercedes-Benz E-Class electrical problems
severe 22 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
22
Recalls
0
Avg fix
$850
1fire
2injuries
When does it fail?
Of the 22 electrical complaints filed for the 2005 Mercedes-Benz E-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
Among the 18 model years of Mercedes-Benz E-Class in our records for electrical problems, this one ranks #3 by owner-complaint volume.
No new NHTSA electrical complaint has been filed on this vehicle in over 21 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners report a pattern of electrical system failures across multiple subsystems. The most recurring issue is crankshaft position sensor failure combined with deteriorating wiring harness insulation—one owner spent over $4,000 chasing repeated sensor and alternator failures tied to defective wiring. Steering column wiring harnesses cause SRS airbag warning lights and prevent airbag deployment in a crash; Mercedes has a known service kit and bulletin for this but has not issued a recall, leaving owners to pay $700–$950 per repair.
Battery drain and charging issues appear frequently—vehicles sitting unused for a day or two go dead, and owners report multiple battery replacements and alternator failures. Cold-weather steering column control failures (horn, switches) are documented, with repairs not holding.
Instrument cluster failures include fuel gauge and speedometer reading errors persisting after dealer repair attempts. Engine stalls during deceleration and traffic stops due to crank sensor failure create serious safety hazards. One owner experienced complete electrical shutdown (EIS module failure) at freeway speed. Fuel sending unit connectors melt, causing interior fuel leaks. Occupancy sensor false activations trigger unwarranted airbag and seatbelt warnings. Engine wiring deterioration poses fire risk, and one owner reported an engine compartment explosion during startup following battery service.
Same Mercedes-Benz E-Class electrical reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Crankshaft sensor/wiring harness failure causing start and running issues
Crankshaft position sensor and its wiring harness fail, preventing engine start or causing repeated check engine light codes. Owners report the sensor failing multiple times on the same vehicle, compounded by defective wiring harness covering that becomes brittle and shorts out components.
When: 88,500 miles on purchase; recurring across mileage spectrum
Symptoms owners cite: Check engine light illumination; Engine turns over but will not start; Repeated failure after repair; Limp mode operation
Codes mentioned: Crankshaft sensor fault, Generator/alternator fault codes
Repairs/costs cited: Crankshaft sensor replacement; wiring harness repair; alternator replacement; ECM/ECU module replacement reported by dealer; over $4,000 spent across multiple repair attempts
Recalls/TSBs owners mention: Owner alleges MB has known about defective wiring harnesses since the 1990s and will only replace them for customers who demand it loudly; no formal recall mentioned
Steering column SCM harness causing SRS light and airbag deployment failure
Wiring harness located on the steering column develops high resistance in the ignition circuit, illuminating the SRS warning light. This prevents airbag deployment in a crash. Mercedes-Benz has issued a service bulletin and repair kit for this known issue but has not issued a recall.
When: Timing not specified; potential issue across fleet
Symptoms owners cite: SRS light illumination on instrument cluster; No apparent triggering event
Codes mentioned: DTC 9103 (resistance value too high in ignition circuit component R12/13), DTC 9123 (resistance value too high in ignition circuit component R12/14)
Repairs/costs cited: Faulty SCM harness on steering column; dealer repair cost approximately $735–$950 labor plus parts ($100–$250); owners report this is a common failure affecting potentially over 100,000 E-Class and CL-Class vehicles
Recalls/TSBs owners mention: Service bulletin P-B-91.60/99E and repair kit issued but no recall; manufacturer declined warranty coverage beyond statute
Engine stalls during deceleration and stopping
Engine unexpectedly shuts off while vehicle is decelerating or coming to a stop at traffic lights or highway off-ramps. Vehicle may restart immediately or require cool-down time before restarting.
When: Not specified for mileage; multiple occurrences reported
Symptoms owners cite: Sudden engine shutdown during deceleration; Engine shutdown at traffic lights; Engine shutdown on highway off-ramp; Difficulty restarting after thermal cool-down period
Codes mentioned: Crank position sensor failure
Repairs/costs cited: Crank position sensor replacement required
Fuel gauge and speedometer displaying inaccurate readings
Instrument cluster gauges (fuel and speedometer) intermittently display incorrect readings. Fuel gauge shows erroneous levels; speedometer reads incorrectly (e.g., showing 1 mph when vehicle is in motion).
When: 68,000–100,000 miles reported
Symptoms owners cite: Fuel gauge showing inaccurate readings; Speedometer displaying incorrect speed; Intermittent failures persisting after repair
Repairs/costs cited: Dealer replaced fuel tank and fuel level sensor; fuel injection and fuel gauge replacement attempted; failures persisted despite multiple dealer visits
Recalls/TSBs owners mention: Vehicles not included in NHTSA campaigns 08V303000 (electrical) or EA13003 (fuel); manufacturer notified but no action taken
EPC unit failure causing brake function loss
EPC (Electronic Power Control) unit fails, resulting in loss of brake response when the brake pedal is depressed. Vehicle coasts but brakes do not engage, creating immediate crash hazard.
When: 129,000–145,000 miles reported
Symptoms owners cite: Brake pedal depression produces no brake response; EPC warning indicator illuminated; Vehicle coasts uncontrolled
Codes mentioned: EPC unit failure
Repairs/costs cited: EPC unit replacement needed; vehicle not repaired by owner in one case
Recalls/TSBs owners mention: Manufacturer indicated service campaign statute had expired and refused repair; vehicle not included in NHTSA campaign 05V133000
Battery drain and charging system failure
Battery drains rapidly when vehicle sits unused for a day or two, causing dead battery. Alternator issues and ongoing charging system problems require repeated battery replacement and continuous trickle charging.
When: Intermittent; occurring over multiple years of ownership
Symptoms owners cite: Dead battery after 1–2 days without driving; Check battery message appearing on startup; Alarm activating unexpectedly while driving or parked; Alarm wearing down battery
Repairs/costs cited: Battery replaced twice in 2 years; alternator replacement; owner now uses battery charger and trickle charger monthly
EIS module and key failure
EIS (Electronic Ignition Switch) module and key fail simultaneously, causing complete loss of gauges, radio, and engine start capability while vehicle is on freeway. Turn signals also stop working.
When: Unspecified mileage
Symptoms owners cite: Loss of all gauges on instrument cluster; Radio failure; Unable to start vehicle; Turn signals inoperative; Complete electrical system malfunction
Codes mentioned: EIS module failure
Repairs/costs cited: EIS module and key replacement; owner reports repair cost $1,300
Steering column electrical controls intermittent failure in cold weather
Controls on the steering column (including horn and convenience functions) periodically stop working, with failures correlating to cold temperatures below 30 degrees Fahrenheit.
When: Cold weather operation below 30°F
Symptoms owners cite: Steering column controls unresponsive; Horn inoperative; Convenience functions inoperative; Controls remain unresponsive after restart
Repairs/costs cited: Dealer repaired wiring but failure recurred shortly after
Fuel sending unit connector melting and fuel leakage
Fuel pump sending unit connector terminals melt or corrode, causing the sending unit to leak fuel inside the vehicle. Owner reports noticing gas odor and discovering puddle on fuel pump sending unit.
When: Unspecified mileage
Symptoms owners cite: Gasoline odor in vehicle interior, progressively worsening; Fuel leak from sending unit; Discolored connector terminals at sending unit; Puddle of gasoline inside vehicle
Repairs/costs cited: Fuel pump sending unit removal and inspection revealed melted connector terminals; owner indicates this is a common problem
Passenger occupancy sensor false activation
Passenger seat occupancy sensor falsely detects an occupant in the passenger seat when the seat is empty, triggering seatbelt warning lights and audible alerts.
When: Unspecified
Symptoms owners cite: Seatbelt warning light activation with empty passenger seat; Warning beeps and chimes; Passenger airbag ready alert when seat empty; Driver distraction from false warnings
Engine compartment electrical wiring deterioration and fire hazard
Headlight and engine compartment wiring deteriorates and breaks down, creating a fire hazard and risk of sudden engine shutdown or crash.
When: Unspecified mileage
Symptoms owners cite: Wiring insulation degradation beyond repair; Fire hazard condition
Engine compartment fire/explosion on startup
Engine compartment experiences loud bang with white smoke and visible damage (hole in front of engine) when turning key to start position after battery service.
When: Following battery recharge and reconnection
Symptoms owners cite: Loud explosion/bang from engine compartment; White smoke from engine bay; Continued smoking after event; Visible hole in engine front
Repairs/costs cited: Damage visible to engine front casing
Synthesized from 22 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had electrical trouble with your 2005 Mercedes-Benz E-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 E-Class?
It's a meaningful issue. 22 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Across the 20 complaints that reported odometer mileage, most electrical failures cluster between 85,000 and 145,000 miles, with the median around 123,000. A quarter of owners report trouble before 85,000; a quarter make it past 145,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
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/E-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.