FORD/LINCOLN/MERCURY: MAY HAVE SLUDGE BUILDUP IN THROTTLE BODY LEADING TO LESS AIRFLOW OR ENGINE IDLING RPM FLUCTUATION AND HARD STARTS OR BATTERY DISCONNECT OR DEAD BATTERY AFTER KEEP ALIVE MEMORY (KAM) CLEAR. MODELS 2003-05 THUNDERBIRD, 05-06 MUSTANG, 06-08 FUSION, 04-05 EXPLORER, 05-06 EXPEDITION, 05-07 F-150; 2003-06 LS, 06 ZEPHYR, 05-06 NAVIGATOR; 06-08 MILAN.
full bulletin at NHTSA ↗2005 Lincoln LS electrical problems
severe 14 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
14
Recalls
0
Avg fix
$850
1crash
When does it fail?
Of the 14 electrical complaints filed for the 2005 Lincoln LS, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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
No new NHTSA electrical complaint has been filed on this vehicle in over 13 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
FORD/LINCOLN MERCURY: CERTAIN 2003-2005 MODEL YEAR LINCOLN LS AND FORD THUNDERBIRD VEHICLES EQUIPPED WITH 3.9L ENGINE WITH EXTENDED WARRANTY COVERAGE ON IGNITION COIL ASSEMBLIES AND ON 2003 MY VEHICLES ONLY , ENGINE VALVE COVER GASKETS.
full bulletin at NHTSA ↗AM/FM AND CELLULAR PHONE RECEPTION INTERFERENCE - SERVICE TIP.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2005 Lincoln LS electrical complaint cluster centers on a dangerous intermittent failsafe mode tied to the electronic throttle control (ETC) system. Owners describe their engines suddenly entering failsafe, cutting power to near-idle levels during highway driving—sometimes repeatedly within one trip. The warning clears after a power cycle, only to recur. Dealerships often cannot reproduce the fault and claim the throttle body is not warranty-covered, even when the vehicle is relatively new. One owner was quoted $900 for replacement and faced a 30-day parts delay; another underwent throttle body replacement but the failsafe continued.
Ignition coil packs fail prematurely on low-mileage vehicles, with dealers replacing all 6 coils and spark plugs at significant cost despite the failure codes matching Ford service bulletins. Climate control systems blow only hot air after warranty expiration, and one dealership charged $170 for diagnostics, then refused coverage.
Owners also report cascading electrical failures—alternator, battery, starter, and power module issues occurring in combination—that dealer service has not resolved. Fuel odor in the cabin and a hyperactive security alarm round out the electrical complaints. Owners across forums and complaints cite thousands of affected vehicles and a complete absence of factory recalls.
Failure modes owners describe
ETC Engine Failsafe Mode / Throttle Body Failure
Electronic throttle control system enters failsafe mode, severely restricting engine power to idle or near-idle speeds. Engine loses power during acceleration or highway driving; vehicle can only travel 10-35 mph. Occurs intermittently and resets after power cycle, but recurs repeatedly. Dealership diagnostics often fail to reproduce the fault. Multiple owners report this has affected thousands of Lincoln LS vehicles, yet Ford has not issued a recall.
When: Occurs intermittently during driving, sometimes repeatedly within short timeframes. One owner reported three failsafe incidents before leaving driveway. Another at 78k miles; another at 33k miles.
Symptoms owners cite: Engine warning light illuminates; ETC Engine Failsafe Mode warning on dashboard; Loss of engine power, severe power restriction; Engine idles down, cannot exceed 10-35 mph; Rough idle, shaking, sputtering; Vehicle stalls; Power returns after shutdown and restart; Abrupt gear changes during low-speed acceleration
Codes mentioned: P0600 series (ETC related), Throttle body codes
Repairs/costs cited: Throttle body assembly replacement costs $900 per one owner. Parts availability cited as problematic—one dealership quoted 30-day lead time. After replacement, failsafe condition continued in at least one case, suggesting either inadequate repair or root cause misdiagnosis.
Recalls/TSBs owners mention: Dealership states throttle body is not a warranty item. Ford has not issued a recall despite widespread owner reports. One owner's dealer requested Ford assistance with an $18,000 repair bill; request declined. Owners cite existence of Ford service bulletins addressing similar codes.
Ignition Coil Pack Failures
Ignition coils fail prematurely, causing misfire, stalling, and loss of power. Owners report failures on low-mileage vehicles. One owner replaced all 6 coils plus spark plugs for $1,350 despite quoted codes matching a Ford service bulletin. Dealers cannot pinpoint which specific coils are faulty without replacement trial.
When: Low mileage vehicles. One owner at 54k miles; coil packs failing as a set of 3 or 6.
Symptoms owners cite: Check engine light illuminates; Wrench warning light illuminates; Loss of power and stalling; Engine misfire; Codes present in Ford service bulletins but dealers lack specific identification
Codes mentioned: Misfire codes (specific codes not named by owners)
Repairs/costs cited: Replacement of 3 or all 6 coil packs and spark plugs. One owner paid $1,350 for all 6 coils and spark plugs on a 54k-mile vehicle. Service bulletin allegedly exists documenting this issue.
Recalls/TSBs owners mention: Ford service bulletins exist that address these codes, but dealerships claim inability to identify specific faulty coils without replacement attempts.
Climate Control / A/C Blowing Hot Air
A/C system fails after warranty expiration, blowing only hot air regardless of settings. One owner's climate control device required replacement three separate times. Dealerships initially demanded $170 diagnostic fee and then refused warranty coverage, blaming owner for insufficient vehicle usage.
When: Begins shortly after warranty expiration. One owner's device failed 3 times over the ownership period.
Symptoms owners cite: A/C blows only hot air; Intermittent climate control malfunction
Repairs/costs cited: Climate control device replacement. One owner paid $170 diagnostic fee with no warranty coverage offered. Device required replacement 3 times.
Recalls/TSBs owners mention: Lincoln dealer refused to cover repair, claiming owner fault due to infrequent driving. No recalls or TSBs cited.
Parking Brake Error / Automatic Engagement
Intermittent error messages indicating parking brake service required appear shortly after warranty expiration. One owner reports parking brake error triggered alongside ETC failsafe, with dealership suggesting automatic engagement mechanism malfunction.
When: Shortly after warranty expiration. Low-mileage, well-maintained vehicles.
Symptoms owners cite: Parking brake service warning message on dashboard; Intermittent error codes; Parking brake error occurs with ETC failsafe symptoms
Repairs/costs cited: Owners not provided repair estimates or specifics.
Recalls/TSBs owners mention: None documented.
Electrical System Issues / Battery, Alternator, Starter Failures
Multiple electrical components fail in series or combination: alternator, battery, starter, power module. One owner's vehicle required replacement of thermostat, alternator, power module, and battery, yet continued to stall after repairs. Vehicle later stalled twice post-repair; dealership then stated starter needed replacement.
When: At 33k miles in one documented case.
Symptoms owners cite: Engine warning light illuminates; Stalling; Vehicle loses power
Repairs/costs cited: Replaced thermostat, alternator, power module, battery, and starter in one documented case. Vehicle remained at dealership; current mileage was 33,964 at last report.
Recalls/TSBs owners mention: No warranty assistance mentioned.
Fuel System / Smell of Gasoline Inside Cabin
Fuel odor inside the vehicle cabin reported by owners. One owner replaced fuel pump and MAF sensor without resolving persistent power-loss issues, suggesting potential fuel system contamination or sensor malfunction.
When: Ongoing throughout ownership in some cases.
Symptoms owners cite: Strong gasoline smell inside cabin; Power loss and stalling (may be related)
Repairs/costs cited: Fuel pump and MAF sensor replacement attempted without resolution of underlying power-loss symptoms.
Recalls/TSBs owners mention: No recalls or TSBs mentioned.
Coolant Reservoir Cracking / Freeze Damage
Anti-freeze and windshield washer fluid reservoir cracked during extreme cold weather, attributed to thin-walled design.
When: During extreme cold weather conditions.
Symptoms owners cite: Fluid leakage; Cracked reservoir
Repairs/costs cited: Reservoir replacement required.
Recalls/TSBs owners mention: No manufacturer response documented.
Security Alarm Malfunction
Security alarm triggered repeatedly and excessively throughout each day, classified as electrical system malfunction.
When: Ongoing, multiple times daily.
Symptoms owners cite: Alarm sounds many times each day unprompted
Repairs/costs cited: Not specified by owner.
Recalls/TSBs owners mention: No manufacturer response documented.
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
Since purchasing this car, its been nothing but problems. The problems I've experienced aren't any different from all the other ls owners. Coil packs going bad, the a/c blowing hot air, the car going into fail safe mode while on the freeway, the smell of gasoline inside the car. It looks like these issues have been going on since Ford started producing the car. Now wonder they needed bailout…
2005 Lincoln ls v8 etc failsafe error -- mainly happens after heavy rain. Car will not shift correctly then loses power. Etc failsafe & parking brake error is shown on dashboard. Happens constantly on the highway when trying to merge or pass someone. Dealership says is has something to do with the parking brake trying to automatically engage. *tr
Safety problem car still in warranty time after time had concerns about my problems now have my car at crown Ford nashville tn. Out of warranty now have to pay 18000 dollars to fix, even the dealer asked Ford to help but its fell on deaf ears im sure Ford does not care at all. *tr
Had electrical trouble with your 2005 Lincoln LS?
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 Lincoln LS?
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?
Across the 12 complaints that reported odometer mileage, most electrical failures cluster between 43,000 and 80,000 miles, with the median around 66,000. A quarter of owners report trouble before 43,000; a quarter make it past 80,000. 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/Lincoln/LS.
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.