Some versions of Model S and X front drive unit halfshafts might cause excessive vibrations during hard acceleration at higher ride height settings. This is exclusively an NVH issue and does not otherwise affect steering functionality, braking, or acceleration.
full bulletin at NHTSA ↗2014 Tesla Model S powertrain problems
moderate 24 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
24
Recalls
0
Avg fix
$2,500
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain 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.
Older versions of the Model S and Model X LH front drive unit clevis mount contain a bushing that allows the front drive unit to move side-to-side more than expected during hard accelerations, resulting in excessive vibrations coming from the front drive unit during hard acceleration. This is exclusively an NVH issue and does not otherwise affect steering functionality, braking, or acceleration.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2014 Model S powertrain cluster shows two dominant failure patterns. First is the Large Drive Unit rotor seal leaking ethylene glycol coolant directly into the motor and inverter, visible as blue fluid in the motor cavity. This corrodes windings, washes out bearing grease, causes isolation faults, and totals the drive unit—typically between 50,000 and 120,000 miles. Replacement runs $6,500–$8,000. Tesla has made design changes in later years but never recalled earlier units despite widespread reports.
Second is sudden power loss while driving: drivers hit critical error messages, lose propulsion, and must pull over and restart the computer to regain drivability. One owner logged ten-plus service visits and a dozen component replacements over 380 days with no permanent fix. An early P85D died completely two days after delivery in freezing weather.
Owners also report battery degradation tied to 2019.16.x software updates that cut range 20–30 miles overnight, slowed supercharging by 50% or more, and throttled maximum voltage. Tesla denies warranty coverage, claiming updates improve longevity. A separate group complains of dashboard blackouts, MCU failures disabling turn signals and climate control, subframe cracks, and door handle failures where sensors fail open or motors fail closed, trapping occupants.
Same Tesla Model S powertrain reports on nearby years: 2013
Failure modes owners describe
Large Drive Unit (LDU) Rotor Seal Failure & Coolant Intrusion
Rotor seal in the rear Large Drive Unit fails, allowing ethylene glycol coolant to leak internally into the motor and inverter. Visible evidence includes blue coolant, corrosion, and debris accessible via rear speed sensor removal. Causes corrosion in stator windings, grease washout from bearings, high-voltage isolation faults, inverter damage, and complete drive unit failure.
When: Between 50,000–120,000 miles; one complaint at 148,129 miles
Symptoms owners cite: Loud whining or grinding noise from rear drive unit; Gradual noise increase over time; Complete loss of propulsion; Visible blue coolant inside motor/inverter cavity; Internal corrosion and debris accumulation
Repairs/costs cited: Drive unit replacement cost reported as $6,582.04 to $7,000–$8,000. Owners note Tesla has made design changes including elimination of a cooling branch through the motor in later iterations, but earlier design iterations have not been fixed. Tesla has replaced many units post-warranty.
Recalls/TSBs owners mention: No recall issued despite widespread reports. Tesla aware of problem and has replaced many units. Made design changes to later models but did not address earlier production vehicles.
Battery Degradation & Throttling via Software Update
Software updates, specifically 2019.16.x firmware, caused significant battery capacity loss, reduced range, and throttled charging speeds. Owners report loss of 20–30 miles of range overnight and charging speeds reduced by 50% or more. Tesla claims updates improve battery longevity and health but denies warranty claims alleging no manufacturing defect.
When: May 2019 and later software updates (2019.16.x); occurring after update deployment
Symptoms owners cite: Sudden 20–30 mile range loss overnight after software update; Supercharging speed reduced by 50% or more (taking 3x longer); Reduced maximum battery voltage capacity; High battery discharge rate when vehicle parked; Inability to reach same rated mileage as before update
Repairs/costs cited: No repair; Tesla denies warranty replacement claiming no manufacturing defect. One arbitration claim at National Center for Dispute Settlement denied. Owners report subsequent software updates have failed to restore lost range or charging capability.
Recalls/TSBs owners mention: No recall. Tesla claims updates address battery longevity and fire prevention. Denied warranty claims. Updates rolled out without owner notification. Arbitration denied defect claim.
Sudden Power Loss & Fault Message During Driving
Vehicle loses power without warning while driving, displaying critical error messages ('Car Needs Service - Pull Over Safely,' 'Reduced Power' mode). Power loss can be complete or partial, forcing emergency pullover. Requires computer restart(s) to regain drivability. Occurs randomly and unpredictably.
When: One complaint from early 2014 car starting March 2017; early P85D with <200 miles reported loss after 2 days; recurring across multiple owners
Symptoms owners cite: Complete or near-complete loss of propulsion while driving; Critical error messages on display; Cruise control disengagement without warning; Reduced power/turtle mode activation; Vehicle heater stops working alongside power loss; Requires restart of main computer to restore drivability
Repairs/costs cited: One owner reported vehicle in shop >10 times with >12 components replaced over 380+ days; deemed unfixable by service centers in Virginia, Maryland, and San Juan PR. Another reported contactor failure in 2-day-old P85D. No permanent repairs documented.
Recalls/TSBs owners mention: No recall issued. Service centers unable to diagnose or fix issue permanently. One owner noted Tesla recalling faulty electrical contactors 'secretly through forums' rather than public recall.
Drive Unit Bearing Failure & Whining Noise
Bearing in drive shaft becomes damaged, producing persistent loud whining noise during acceleration. Separate from LDU seal failure but also affects drive unit longevity and drivability.
When: Timeline not specified; one complaint noted 'constant' whining
Symptoms owners cite: Loud whining noise from rear drive unit during acceleration; Noise gradually worsens over time; Noise during acceleration, deceleration, and backing up
Repairs/costs cited: Drive shaft replacement required. One owner reported dealer ordering part in 2021 with 7-day ETA but subsequent service communication was poor and unresponsive.
Main Computer Unit (MCU) Failure
Total failure of vehicle main computer unit, disabling critical safety features and vehicle control functions. Loss of access to turn signals, hazard lights, autopilot settings, suspension controls, headlight controls, door locks, navigation, climate control, and sunroof operation.
When: Timeline not specified in complaint
Symptoms owners cite: Complete MCU failure / black screen on dash; Turn signals inoperable; Hazard lights inoperable; Autopilot settings unavailable; Suspension settings inaccessible; Headlight manual control unavailable; Manual door lock/unlock unavailable; Navigation system offline; A/C and sunroof controls offline
Dashboard Screen Blackout & Loss of Safety Controls
Dash display blacks out intermittently, causing loss of visibility to speed, backup camera, and safety-related powertrain controls. Owner reports repeated complaints to Tesla without resolution.
When: Recurring intermittently
Symptoms owners cite: Dash display goes black; Speed readout unavailable; Backup camera display offline; Powertrain control unavailable while driving; Loss of visibility to critical vehicle status
Recalls/TSBs owners mention: Tesla does not respond with results or fixes; issue remains unresolved.
Subframe Structural Failure
Subframe cracked or broke during normal highway driving with no prior impact or accident, causing thumping sound during acceleration, deceleration, and backing up.
When: 80,000 miles
Symptoms owners cite: Loud thumping sound when accelerating; Thumping during deceleration; Thumping during backing up
Water Intrusion into Drivetrain
Water intrusion into drivetrain components causing complete drivetrain failure. Owner claims warranty should have covered it (8 years unlimited miles) but Tesla denied coverage.
When: Within original warranty period
Symptoms owners cite: Water intrusion into drivetrain; Complete drivetrain failure
Repairs/costs cited: Repair cost not specified; Tesla denied warranty coverage.
Recalls/TSBs owners mention: Denied warranty claim despite 8-year unlimited-mile powertrain warranty.
Door Handle Sensor & Motor Failures
Door handle sensors and motors fail, causing safety hazards. Sensor failure allows door handles to extend freely and unintentionally; motor failure prevents handles from extending, trapping occupants. Reported as common on Generation 1 Model S.
When: Multiple failures on same vehicle
Symptoms owners cite: Door handle fails to extend when needed, preventing entry/exit; Door handle extends freely without button press; Door handle motor defects; Door handle sensor failures
Repairs/costs cited: Replacements covered under warranty; owner had 2 replacements and sensed fault developing in a third handle.
Synthesized from 24 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
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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 powertrain problem on the 2014 Tesla Model S?
It's a documented issue but not catastrophic. 24 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Based on the 24 complaints filed, powertrain issues most often appear around 66,934 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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/2014/Tesla/Model S.
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.