Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
full bulletin at NHTSA ↗2020 Acura RDX powertrain problems
severe Owners of the 2020 Acura RDX have filed 21 NHTSA complaints about the powertrain, typically surfacing around 5,040 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
21
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2016 RDX | 6 |
| 2017 RDX | 20 |
| 2018 RDX | 12 |
| 2019 RDX | 36 |
| 2020 RDX (this page) | 21 |
| 2021 RDX | 9 |
1crash
2injuries
What stands out
Among the 8 model years of Acura RDX in our records for powertrain problems, this one ranks #2 by owner-complaint volume.
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 MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
full bulletin at NHTSA ↗Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
full bulletin at NHTSA ↗Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
full bulletin at NHTSA ↗Service Bulletin - The AWD indicator comes on with DTC C1843-62 (left rear differential fluid pressure deviation) and/or DTC C1844-62 (right rear differential fluid pressure deviation).
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2020 Acura RDX powertrain complaints center on sudden, unpredictable loss of engine power—typically called "limp mode" by owners—occurring during acceleration or highway driving. Vehicles drop to 10–20 mph and won't respond to throttle input, forcing owners to coast to safety and restart the engine to restore normal operation. The check engine light flashes when this happens; some complaints mention additional warning lights (AWD problem, ABS problem, transmission warnings).
Failures are recurring and happen across multiple scenarios: accelerating from stops, passing slower vehicles, merging onto highways, and driving in wet conditions (rain, humidity). Some owners report the issue twice or more within days; one reported four incidents by 15,000 miles. Mileage ranges from 280 to 41,345 miles, with several occurring well under 5,000 miles on brand-new vehicles.
Dealers have struggled to reproduce the failure during test drives. When fault codes appear, they either clear after restart or don't show up at all. One dealer identified two non-firing cylinders; another cited an engine coil defect; one owner was told the cause was fuel choice; another was informed of a known turbo intercooler design flaw without available parts or recall. Two complaints mention awareness of a class action lawsuit filed in 2020. No owner reports permanent factory repair or recall resolution.
Same Acura RDX powertrain reports on nearby years: 2017 · 2018 · 2019
Failure modes owners describe
Sudden loss of engine power / Limp mode activation
During acceleration or highway driving, engine abruptly loses power and enters limp mode, limiting vehicle speed to 10–20 mph. Throttle input produces no response. Check engine light flashes. Power returns only after turning off and restarting the engine.
When: Mileage ranges 280 to 41,345 miles; most complaints occur under 5,000 miles. Triggered during acceleration, passing, merging, highway speeds (35–75 mph), and wet-road conditions.
Symptoms owners cite: Sudden loss of power while accelerating; Vehicle speed drops to 10–20 mph despite throttle input; Check engine light flashes or illuminates; Vehicle enters limp mode; will not accelerate; Additional warning lights (AWD, ABS, transmission); Engine appears to run but produces no power; Requires engine restart to restore normal operation
Codes mentioned: Check engine light (code not specified in narratives), Two cylinders not firing (reported once), Multiple alarm codes (reported once)
Repairs/costs cited: Dealers cannot consistently reproduce issue. Some report clearing codes without identifying root cause. One owner was told turbo intercooler design flaw is known but parts unavailable. Another was told fuel choice was the cause. No permanent repair mentioned in any narrative.
Recalls/TSBs owners mention: Acura acknowledges known turbo intercooler design flaw per one complaint. Class action lawsuit filed in 2020. Acura advised owners to turn vehicle off and restart. No recall issued per complaints. Some owners told repair is out of warranty and at owner expense.
Transmission/drivetrain hesitation and downshift failure during acceleration
When accelerating, vehicle hesitates to downshift or transition gears smoothly. Engine RPMs climb (6,000–7,000) but vehicle barely accelerates, as if transmission is not responding to throttle input. Restart required.
When: Under 5,000 miles; also reported at 15,000 miles. Occurs during rapid acceleration from standstill or highway passing maneuvers.
Symptoms owners cite: Severe hesitation during acceleration from stop (barely exceeds 5 mph); High engine RPM (6,000–7,000) with minimal vehicle speed increase; Vehicle will not shift gears or downshift properly; Transmission appears to ignore accelerator input; Problem resolves only after engine restart
Codes mentioned: No fault code found (reported in multiple narratives)
Repairs/costs cited: Dealers drove vehicles over 150 miles and could not reproduce issue. No codes found. No repair attempted.
Recalls/TSBs owners mention: Acura confirms no recall or permanent solution available per complaint #2. Known issue with Acura transmissions since 2016; class action lawsuit filed in 2020.
Engine coil defect or ignition misfire
Vehicle violently shakes and stutters during wet-weather acceleration. All power lost. Multiple check engine lights illuminate. One dealer diagnosed engine coil defect; same failure recurred within three weeks under identical wet-weather conditions.
When: Mildly rainy conditions; second occurrence three weeks after first repair.
Symptoms owners cite: Violent shaking and stuttering during acceleration; Complete loss of power; All check engine lights illuminate; Dangerous loss of power during highway merge
Codes mentioned: Multiple check engine lights
Repairs/costs cited: One dealer replaced or serviced engine coil. Problem recurred identically three weeks later; awaiting second diagnosis.
Fuel pump pressure line seal failure
Engine quit while making a right turn off a busy road. Vehicle would not restart and transmission locked into park electronically, immobilizing the vehicle and blocking traffic. Dealer replaced defective O-ring in fuel pump pressure line.
When: Mileage and timing not specified. Owner notes this was a recall item previously performed by dealer.
Symptoms owners cite: Engine quit without warning; Vehicle would not restart; Transmission locked in park electronically (no neutral option); Vehicle blocked road, creating traffic hazard
Repairs/costs cited: Replaced defective O-ring in fuel pump pressure line.
Recalls/TSBs owners mention: This was a known recall item per owner statement.
Low battery voltage / electrical failure at very low mileage
Vehicle at 1,390 miles failed to accelerate when pedal depressed. Multiple warning lights illuminated. Problem persisted even after restart. Dealer diagnosed low battery voltage but owner continued to experience failure.
When: 1,390 miles (brand new vehicle).
Symptoms owners cite: Failure to accelerate despite throttle input; Multiple unknown warning lights; Problem persists after restart; Vehicle not drivable
Repairs/costs cited: Dealer diagnosed low battery voltage; outcome of repair not stated.
Unintended high-speed acceleration followed by violent deceleration
During normal 35 mph driving, vehicle made strange noise from engine compartment and wheel jerked violently. Vehicle suddenly accelerated without driver input to approximately 100 mph, then decelerated with another strange noise and jerk. Event recurred after exiting highway. Owner crashed into three parked vehicles, sustaining serious injuries (broken sternum, internal bleeding, lumbar fracture).
When: Approximately 5,040 miles.
Symptoms owners cite: Strange noise from engine compartment; Violent unintended acceleration to ~100 mph; Jerking of steering wheel during acceleration; Sudden unintended deceleration; Multiple recurrences of same behavior
Repairs/costs cited: Vehicle deemed total loss; not repaired.
Recalls/TSBs owners mention: Manufacturer stated unable to assist.
Synthesized from 21 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had powertrain trouble with your 2020 Acura RDX?
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 2020 Acura RDX?
It's a meaningful issue. 21 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 3,400 and 13,657 miles, with the median around 5,040. A quarter of owners report trouble before 3,400; a quarter make it past 13,657. 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/2020/Acura/RDX.
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.