Service Bulletin - During a downshift from 9th or 8th gear to 7th gear or lower, a miscalculation in the TCM software causes the MIL to come on with DTC P0716 (input shaft [mainshaft] speed sensor [range/performance]).
full bulletin at NHTSA ↗2017 Acura TLX powertrain problems
severe Owners of the 2017 Acura TLX have filed 18 NHTSA complaints about the powertrain, typically surfacing around 21,000 miles at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Failure mileage
Complaints
18
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2015 TLX | 151 |
| 2016 TLX | 14 |
| 2017 TLX (this page) | 18 |
| 2018 TLX | 10 |
| 2019 TLX | 10 |
| 2020 TLX | 7 |
| 2021 TLX | 23 |
1crash
When does it fail?
Of the 18 powertrain complaints filed for the 2017 Acura TLX, 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 8 model years of Acura TLX in our records for powertrain problems, this one ranks #3 by owner-complaint volume.
Powertrain accounts for 26% of all owner complaints filed against this vehicle, across 3 categories tracked.
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.
Service Bulletin - The transmission has intermittent harsh or jerky upshifts with steady acceleration.
full bulletin at NHTSA ↗Service Bulletin - During a downshift from 9th or 8th gear to 7th gear or lower, a miscalculation in the TCM software causes the MIL to come on with DTC P0716 (input shaft [mainshaft] speed sensor [range/performance]).
full bulletin at NHTSA ↗Service Bulletin - The transmission has intermittent harsh or jerky upshifts with steady acceleration.
full bulletin at NHTSA ↗Service Bulletin - During a downshift from 9th or 8th gear to 7th gear or lower, a miscalculation in the TCM software causes the MIL to come on with DTC P0716 (input shaft [mainshaft] speed sensor [range/performance]).
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2017 TLX powertrain shows a pattern of control-system and transmission failures. Most serious is the "Smart Power Control Unit" behind the glovebox—at least one owner had a chip that wasn't fully sealed at the factory, allowing contamination to short the circuit board. This cascades into all warning lights flashing, loss of steering control, ADAS offline, and the car refusing to exceed 40 mph or shift above 3rd gear. Fire risk and loss of control while driving are cited as major concerns.
Transmission issues dominate the complaints. Multiple owners report the transmission spontaneously drops into neutral at highway speeds (60–75 mph), locking there until the engine is restarted. Others describe shift hesitation in Normal mode—the car won't downshift even at full throttle, forcing use of paddle shifters. One owner's transmission locked up entirely at 45,600 miles and required replacement. At low speeds, several owners report the transmission jerks or lunges like a rear-end impact, especially between 2nd and 3rd gear.
Throttle response failures also appear repeatedly. Some owners lost all power when pressing the gas; all lights flashed, and the car was stuck in 3rd or 4th gear at wrong RPM. A transmission control module update was applied under warranty but the problem recurred months later. Push-button transmission selectors are documented as debris-sensitive per Acura's own service bulletin (B17010C, Feb 2017). One vehicle stalled repeatedly despite battery replacement and early in ownership (15 miles). Engine-revving-to-redline events with "Transmission Too Hot" warnings and actual flywheel shear have been reported. Dealers often blame software or fuel pump issues, and several owners state no permanent fix has been offered.
Same Acura TLX powertrain reports on nearby years: 2015 · 2016 · 2018
Failure modes owners describe
Smart Power Control Unit (SPCU) failure
Circuit board chip lacks full sealant coating from factory, allowing potential contamination (mold, dust, organic growth) that shorts ground pins. Causes cascading electrical system faults and loss of vehicle control.
When: Varies; one owner noted issue within minutes of starting vehicle; disconnecting battery provides temporary relief
Symptoms owners cite: All warning lights illuminated and blinking (transmission, parking brake, traction control, engine, emissions); Headlights randomly turn on; alarm intermittently sounds; ADAS completely offline; Steering disrupted; random electrical component malfunctions; Cannot exceed 40 mph; car will not shift above 3rd gear; Engine runs louder than normal; Car rolls backward on inclines if driver not careful; Rapid electrical discharge of components
Codes mentioned: Multiple fault codes (not specified by owner)
Repairs/costs cited: Dealership confirmed SPCU failure located behind glovebox; requires unit replacement; owner notes fire risk and potential loss of control
Transmission control module (TCM) software fault—loss of throttle response
Intermittent loss of throttle response accompanied by all dashboard lights flashing. TCM update was applied under warranty but problem recurred post-repair.
When: 2017, 2018, 2019 recurring incidents; last occurrence August 2019; problem can occur after update application
Symptoms owners cite: Complete loss of throttle power when pressing gas pedal; All lights in car flash; Check engine light and emissions system warning light remain on after incident; Emergency parking brake warning displayed; Vehicle downshifts abruptly into wrong gear (e.g., 4th gear at 60 mph with 4500 rpm)
Codes mentioned: Check engine, Emissions system problem, Emergency parking brake problem
Repairs/costs cited: Transmission control module update applied under warranty (June 2019); dealer cleared fault codes; problem recurred after repair
Recalls/TSBs owners mention: TCM software update provided under warranty (June 2019)
Transmission neutral-drop (software bug)
Transmission spontaneously shifts into neutral while coasting, decelerating, or accelerating, then recovers after 1–3 seconds. Consumer reports this as a software bug, unrelated to the recall applied.
When: Occurs unpredictably during long drives; at least once per 8-hour trip; most common during gentle acceleration from cruise control
Symptoms owners cite: Transmission abruptly enters neutral while vehicle is moving; Disconnect from engine during gentle acceleration or braking; Vehicle coasts for 1–3 seconds before transmission re-engages; No warning lights initially, but severe instances generate all error messages (engine, parking brake, emission, side warning, transmission); Multiple error messages flash when stuck in 3rd gear unable to shift up or down
Codes mentioned: Engine, Parking brake, Emission, Transmission, Side warning
Repairs/costs cited: Owners report pulling over and restarting engine resets system; dealer stated no fix available at time of complaint; cleaning gear selector buttons did not resolve issue
Recalls/TSBs owners mention: Acura service advisor stated issue is known software problem with no fix available at time of service
Transmission shift hesitation / delayed downshift
Transmission fails to downshift when accelerating from low speeds in Normal mode. Vehicle remains in high gear (4th–5th) with low RPM (1200) despite full throttle input. Sport Plus mode does not exhibit the problem.
When: Occurs primarily within 10 minutes of engine start; at speeds 5–40 mph
Symptoms owners cite: Transmission will not downshift from 4th or 5th gear during acceleration; Vehicle stays in high gear at low RPM (1200) even with foot to floor; Severe hesitation feels like engine stall; inadequate acceleration response; Paddle shifter used to force lower gear selection; Almost caused accident when merging onto highway (expected acceleration did not occur); Happens at least once per week
Repairs/costs cited: Vehicle serviced twice for this issue; fuel pump recall (January 2019) did not resolve it
Push-button transmission selector malfunction / debris sensitivity
Transmission selector buttons are susceptible to contamination by crumbs, sand, or liquid. Can cause vehicle to enter limp mode, drop to 40 mph, and illuminate multiple fault lights. Service article B17010C (Feb 2017) documents issue.
When: Occurs randomly; one incident at 70 mph
Symptoms owners cite: Multiple fault lights appear on dash; Vehicle speed abruptly limited to 40 mph or less; Push-button selector becomes unresponsive or unreliable
Codes mentioned: Multiple fault codes (not detailed)
Repairs/costs cited: Warranty repairs logged 9/25/2017 and 10/04/2017; Acura Service News B17010C Version #2 (Feb 2017) references this issue
Recalls/TSBs owners mention: Acura Service News B17010C Version #2 (Feb 2017) acknowledges push-button selector debris sensitivity
Transmission locks in neutral; unable to shift
Vehicle abruptly shifts into neutral at highway speeds and locks there, disabling all gear selection. Multiple warning lights illuminate. Restart required to regain drivability.
When: Occurs during highway driving at 60–75 mph; one incident noted on hot day (90°F)
Symptoms owners cite: Vehicle suddenly shifts into neutral while driving; Complete loss of power / vehicle coasts to shoulder; Transmission locked in neutral; cannot select any gear; Warning lights for transmission, electric brake, and emissions illuminated; Dashboard lights remain on but vehicle is otherwise unresponsive; Vehicle cannot be locked or driven until restart; After restart, transmission shifts roughly (jerky behavior)
Codes mentioned: Transmission warning, Electric brake warning, Emission system warning
Repairs/costs cited: One owner required new transmission (diagnosed at 45,600 miles); dealer initially blamed fuel pump, then revised to software issue
Recalls/TSBs owners mention: Manufacturer made aware but did not assist; dealer offered no clear resolution
Insufficient transmission fluid recovery / limp mode activation
Vehicle enters limp mode (speed reduced to 40 mph or less) in response to transmission stress or thermal event, with multiple fault codes illuminated. Recovery requires shutdown and restart.
When: Occurs during highway driving; one incident during heavy traffic with temperature above 90°F
Symptoms owners cite: Multiple fault warning lights illuminate (transmission, engine, parking brake, emissions, side warning); Vehicle speed abruptly reduced to 40 mph or less; Transmission limp mode prevents normal shifting; Engine may rev to redline without power delivery
Codes mentioned: Transmission, Engine, Parking brake, Emissions, Side warning
Repairs/costs cited: Restart of vehicle temporarily resolves limp mode; no permanent fix documented
Flywheel shear / internal transmission damage
Flywheel sheared off during highway driving, indicated by 'Transmission Too Hot' warning and sudden engine rev to redline. Requires engine removal and likely full transmission replacement.
When: 60 mph highway driving; vehicle not under warranty at time of failure
Symptoms owners cite: Engine revs to redline without power delivery; Transmission Too Hot warning displayed; Vehicle unable to accelerate; Engine continues revving until shut down; Vehicle cannot restart after shutdown; Repair shop diagnosed sheared flywheel after engine removal
Codes mentioned: Transmission Too Hot
Repairs/costs cited: Flywheel sheared off; requires engine removal and replacement; owner reports significant repair cost; vehicle out of warranty so Acura refused responsibility
Recalls/TSBs owners mention: Acura refused to take responsibility; claimed not manufacturing defect despite owner assertion to contrary
Engine stalling / auto start-stop failure
Vehicle stalls without warning and will not restart immediately. Auto start-stop system malfunctions. Battery replacement does not resolve stalling.
When: Occurs early in ownership (one report at 15 miles); several occasions noted
Symptoms owners cite: Vehicle stalls without warning; Engine restart required; does not restart immediately; Auto start-stop system shuts engine down unintentionally; Stalling persists even after battery replacement
Repairs/costs cited: Battery replaced; stalling continued; owner disabled auto start-stop feature
Transmission hard shift / jerk between gears
Transmission produces harsh jerking sensation during gear changes, especially at low speeds and in stop-and-go traffic. Feels like impact from rear-end collision.
When: Occurs at low speeds; in stop-and-go traffic; between 2nd and 3rd gear transitions
Symptoms owners cite: Jerking or lunging while transmission shifts; Harsh, abrupt shift sensation resembles rear-end collision impact; Occurs during low-speed acceleration and stop-and-go driving; Clunky, unsmooth shift between 2nd and 3rd gear; Vehicle lurches forward at complete stop after coming to rest
Repairs/costs cited: Multiple owners report this issue; no repairs documented in narratives
Brake system failure / loss of braking control
Vehicle fails to brake on command during heavy traffic, resulting in collision with vehicle ahead. Single narrative; unclear if related to powertrain or independent brake system failure.
When: During highway driving in heavy traffic; brakes applied
Symptoms owners cite: Vehicle did not stop when brakes were applied; Vehicle continued forward and struck vehicle ahead; Collision occurred while braking
Synthesized from 18 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
I was driving at approximately 70 MPH in iowa on a 4-lane (non-interstate) when multiple fault lights appeared on the vehicle dash, and the on-board computer abruptly slowed the vehicle's speed to 40 MPH or less. Repeat, abruptly. Fortunately I was not on an interstate amid a pack of 18-wheelers running nose-to-tail at 70+ MPH, which could have resulted in a major accident! Later I found that the…
Had powertrain trouble with your 2017 Acura TLX?
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 2017 Acura TLX?
It's a meaningful issue. 18 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 10 complaints that reported odometer mileage, most powertrain failures cluster between 10,800 and 45,600 miles, with the median around 21,000. A quarter of owners report trouble before 10,800; a quarter make it past 45,600. 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 $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/2017/Acura/TLX.
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.