The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.
full bulletin at NHTSA ↗2016 Toyota Corolla electrical problems
severe Owners of the 2016 Toyota Corolla have filed 13 NHTSA complaints about the electrical at roughly $850 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See electrical across all vehicles →
Complaints
13
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2012 Corolla | 10 |
| 2013 Corolla | 10 |
| 2014 Corolla | 47 |
| 2015 Corolla | 12 |
| 2016 Corolla (this page) | 13 |
| 2017 Corolla | 19 |
| 2018 Corolla | 12 |
| 2019 Corolla | 13 |
| 2020 Corolla | 25 |
3crashes
1fire
1injury
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.
TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered keys will be erased. Follow the procedures in this bulletin to reset a vehicle Immobilizer or Smart Key system.
full bulletin at NHTSA ↗TSB This Service Bulletin includes guidelines meant to help determine whether to repair or replace a wire harness assembly based on damage type. This Service Bulletin should be used in conjunction with the applicable model and model year Electronic Wiring Diagram (EWD) and/or Repair Manual.
full bulletin at NHTSA ↗TT: Some customers may encounter Bluetooth® connectivity concerns such as: ?Difficulty to pair the phone. ?Intermittent Bluetooth® failure to connect to the vehicle when first turning on the vehicle. ?Various Bluetooth® Audio functions are no longer functioning with customer?s phone such as ability to change the track using the steering wheel controls. These concerns can be caused by changes made on the customer?s phone. Make sure to inquire with the customer if the connectivity concerns occurred after receiving an operating system update on their phone, or if they have restored their phone data/settings recently.
full bulletin at NHTSA ↗TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin No. T-SB-0003-19. ?The Introduction and Software Update Information sections have been updated. Service Bulletin No. T-SB-0003-19 is obsolete and any printed versions should be discarded. Some 2016 model year vehicles equipped with Entune? Audio (version UU.11.13), Entune? Audio Plus (version EU.20.21), or Entune? Premium Audio (CU.20.22) or older may exhibit one or more of the following conditions: ?Bluetooth® audio information is missing from instrument cluster MID ?Long street names are not indicated when using turn-by-turn directions ?Abnormal navigation routing ?Toyota Park Assist Settings bu
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners describe multiple electrical failure modes across the 2016 Corolla fleet. Most concerning: rodent damage to wiring harnesses, particularly transmission control harnesses and fuel pump relay wiring around 10,000–20,000 miles. Owners point to soy-based wire insulation as the culprit, claiming it attracts rodents more than traditional materials. Toyota denies warranty coverage for rodent damage as an "outside source."
One owner reports an unexplained fire or explosion inside a parked vehicle, with internal thermal damage and no preceding collision. Another describes the vehicle stalling and dying three times while driving, with no warning lights—a safety hazard given loss of power steering and brakes.
Seat belt issues include intermittent latching and failure to disengage warning indicators. One collision resulted in airbag non-deployment. Door locks fail to respond to key fob commands or ignition. Power windows stop working due to corroded wiring in door cavities. In-dash radio and clock continuously reset, and tire pressure lights malfunction. Front speakers were installed incorrectly at the factory with contacts facing upward, allowing moisture ingress and corrosion.
Dealers have been unable or unwilling to diagnose or repair several of these failures, and owners report little manufacturer responsiveness beyond denying warranty coverage.
Same Toyota Corolla electrical reports on nearby years: 2014 · 2015 · 2017 · 2018 · 2019
Failure modes owners describe
Rodent damage to wiring harness
Rodents chew through electrical wiring, particularly transmission control harness and fuel pump relay wiring. Owners attribute this to soy-based wire insulation used in the vehicle, which they claim is more palatable to rodents than traditional petroleum-based materials.
When: Around 10,000–20,000 miles; varies by vehicle
Symptoms owners cite: TRAC OFF warning light; CHECK ENGINE light; MAINTENANCE REQUIRED light; Vehicle fails to start; Engine stalling
Codes mentioned: P0XXX (general transmission/fuel system related)
Repairs/costs cited: Transmission control harness replacement, fuel pump and relay wiring replacement; owners report costs near $1,000
Recalls/TSBs owners mention: Toyota denies warranty coverage, classifying rodent damage as damage from an 'outside source' and therefore not covered
Unexplained interior fire or explosion
A parked vehicle with no collision history experienced what appears to be an internal fire or explosion on the passenger side, possibly involving the airbag system and electrical components. The vehicle was not running and had been parked for 65 hours. Extensive thermal damage to dashboard, ceiling, sun visor, and underlying components; windshield pushed out and shattered from internal pressure.
When: While parked, no driving involved
Symptoms owners cite: Explosion or fire inside cabin on passenger side; Melted dashboard with gaping hole; Charred ceiling; Melted sun visor; Melted components beneath dash; Shattered and cracked windshield from internal force; Disintegrated airbag material; Stifling odor
Repairs/costs cited: Vehicle total loss; no repairs documented
Engine stalling and shutoff while driving
Vehicle stalls and dies without warning while driving. Engine shuts off mid-drive with no warning lights or messages displayed. Occurs multiple times on the same vehicle. One owner noted a similar recall existed for Toyota Tacoma.
When: Various times while driving; owner with 60,000 miles reports it happened 3 times
Symptoms owners cite: Engine stalls and dies while driving; No warning lights or messages; Car stops running without warning; Loss of power steering and braking assist
Repairs/costs cited: Cause unknown; dealer investigation pending
Recalls/TSBs owners mention: Similar recall mentioned for Toyota Tacoma; unknown if Corolla covered
Seat belt malfunction and airbag non-deployment
Seat belt mechanism fails to engage reliably. In one collision event, airbags did not deploy. Another owner reports seat belt latches intermittently but still shows as unbuckled on dash, with continuous warning chime. ECU may lack adequate electrical noise protection during collision events.
When: Various; documented after collision events
Symptoms owners cite: Seat belt does not latch or latches intermittently; Seat belt warning light stays on even when latched; Continuous seat belt warning chime; Airbags fail to deploy in collision
Codes mentioned: Seat belt pretensioner circuit fault
Repairs/costs cited: Owner reports seat belt issue requires repair; parts and costs not specified
Door lock electrical malfunction
Electric door locks fail to operate correctly. Locks do not respond to key fob or ignition commands. Some locks on the same vehicle work while others stick or fail. Passenger front and rear driver side locks noted as problem areas.
When: Unknown timing
Symptoms owners cite: Door locks fail to unlock via fob or ignition; Some locks stick while others function; Locks attempt to unlock but fail
Power window failure due to corroded wiring
Wiring inside front doors corrodes, rendering electric windows inoperable. Corrosion noted on multiple vehicles from the same model year. Owner cites safety concern regarding emergency window exit and toll payment complications.
When: Unknown timing; appears to be recurring issue on multiple 2016 Corollas
Symptoms owners cite: Electric windows fail to operate; Corrosion visible on door wiring
Radio and clock constant reset; tire pressure light malfunction
In-dash radio and clock continuously reset. Tire pressure monitoring light illuminates and flashes. Owner found YouTube evidence indicating this is a consistent issue across 2014, 2015, and 2016 model year Corollas.
When: Unknown timing
Symptoms owners cite: Radio resets repeatedly; Clock resets repeatedly; Tire pressure light illuminates and flashes
Radio stays on after ignition off; key fob lock/unlock failure
Radio does not turn off when vehicle is shut off. Key fob fails to lock or unlock doors; manual key lock required at driver door. Owner must remove radio fuse to prevent battery drain.
When: Unknown timing
Symptoms owners cite: Radio stays on after ignition off; Key fob does not lock or unlock doors; Battery drain from powered radio; Manual key lock required
Repairs/costs cited: Owner performs temporary fix by removing radio fuse
Acceleration and speedometer failure
Vehicle fails to accelerate when commanded. Speedometer does not display accurate vehicle speed. Failure occurred at low mileage; dealer was unable to diagnose or repair the issue.
When: Approximately 3,000 miles
Symptoms owners cite: Vehicle fails to accelerate; Speedometer inaccurate
Repairs/costs cited: Not repaired; cause undetermined
Recalls/TSBs owners mention: Manufacturer not notified
Front speaker installation defect and corrosion
Front speakers not installed correctly at factory. Electrical contacts oriented upward, allowing moisture accumulation in door cavities, which corrodes and damages contacts over time. Defect present on both passenger and driver side speakers, indicating systematic factory error.
When: Appeared after purchase; damage progressive
Symptoms owners cite: Front speakers not working; Corrosion of speaker electrical contacts; Moisture damage inside door cavities
Repairs/costs cited: Both front speakers replaced at repair shop
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
The driver seat belt dont work and once in a great while it will work but even whenever it does latch it still shows the seat belt isn't on and that noise keeps going off but after a while the noise goes off but the symbol is still on the dash board. I recently got hit from behind (09/15/2025) at a red light and no air bags deployed. Im not sure if they were suppose to deploy but either way my…
Had electrical trouble with your 2016 Toyota Corolla?
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 2016 Toyota Corolla?
It's a meaningful issue. 13 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Based on the 13 complaints filed, electrical issues most often appear around 29,380 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 $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/2016/Toyota/Corolla.
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.