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Service bulletin A20-117

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10184330
Published by NHTSA2020-12-19
Manufacturer's numberA20-117
Manufacturer's date2020-12-09
NHTSA componentEQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING; EQUIPMENT; ELECTRICAL SYSTEM

NHTSA's summary

Service Bulletin - The vehicle may not start upon first press of the ENGINE START/STOP button. Also, MID displays the error message KEYLESS START SYSTEM ERROR, and DTC B12C5 (Engine Start/Stop Switch Failure) is stored. American Honda is extending the warranty for the keyless start system on these vehicles to 9 years from the original date of purchase or 125,000 miles, whichever comes first.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine, Equipment and accessories

Trouble codes named

B12C5

Vehicles listed
HONDA PILOT2016, 2017
HONDA RIDGELINE2017

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
23V7510002023-11-13. ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL
20236032023-11-08. Engine
20204412020-09-17. Accessories
16V8880002016-12-09. ELECTRICAL SYSTEM:WIRING
20166122016-12-08. Electrical
15V6680002015-10-16. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
ATI&032620269052026-04-03. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2019 Ridgelines with a customer complaint of the rearview camera inoperable. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
ATI&031120269022026-03-16. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2019 Ridgelines with a customer complaint of the rearview camera inoperable. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
ATI&022420269022026-03-03. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2019 Ridgelines with a customer complaint of the rearview camera inoperable. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
ATI&010520269012026-01-27. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2019 Ridgelines with a customer complaint of the rearview camera inoperable. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
ATI&102320259022025-11-04. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2019 Ridgelines with a customer complaint of the rearview camera inoperable. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
ATI&101420259042025-11-04. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2019 Ridgelines with a customer complaint of the rearview camera inoperable. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
A23-0092025-07-09. Service bulletin. Service Bulletin - Under certain circumstances, after coming to a stop and engaging idle stop, the vehicle may not restart automatically due to excessive cylinder pressure and/or low cranking torque. Typically, the customer can immediately restart the vehicle by selecting Park and pressing the ENGINE START/STOP button.
A23-0782025-06-05. Service bulletin. Service Bulletin - Torque converters may not have been manufactured to proper specifications. As a result, the torque converter lock-up clutch cannot provide adequate holding force due to pressure bleeding down through a crack in the lock-up piston. The reduced lock-up clutch capacity results in the transmission indicator flashing “D” and set DTC P0741 Torque Converter Clutch Performance or Stuck OFF.
A23-0782025-06-05. Service bulletin. Service Bulletin - Torque converters may not have been manufactured to proper specifications. As a result, the torque converter lock-up clutch cannot provide adequate holding force due to pressure bleeding down through a crack in the lock-up piston. The reduced lock-up clutch capacity results in the transmission indicator flashing “D” and set DTC P0741 Torque Converter Clutch Performance or Stuck OFF.
A23-0782025-04-29. Service bulletin. Service Bulletin - Torque converters may not have been manufactured to proper specifications. As a result, the lock-up clutch cannot provide adequate holding force due to pressure bleeding down through a crack in the lock-up piston. The reduced lock-up clutch capacity results in the transmission indicator flashing “D” and set the DTC P0741 Torque Converter Clutch Performance or Stuck OFF.