# Service bulletin A21\-010

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.

- Type: Service bulletin
- NHTSA id: 10187008
- Published by NHTSA: 2021\-02\-18
- Manufacturer's number: A21\-010
- Manufacturer's date: 2021\-02\-11
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ENGINE AND ENGINE COOLING

## NHTSA's summary

"Service Bulletin \- The PCM software may misinterpret sensor inputs as a deteriorated catalytic converter. Additionally, debris from the high pressure pump or the fuel injector machining process can cause internal wear or clogging inside one or more injectors. One or more of the following DTCs may be stored: \- P0420 \(rear bank catalyst system efficiency below threshold \[bank 1\]\) \- P0430 \(front bank catalyst system efficiency below threshold \[bank 2\]\) \- P0300\-P0306 \(misfire\) \- P219A \(air\-fuel ratio variation of cylinder \[bank 1, rear bank\]\) \- P219B \(air\-fuel ratio variation of cylinder \[bank 2, front bank\]\) American Honda is extending the warranty on these repairs to 10 years from the original date of purchase or 150,000 miles, whichever comes first."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187008-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187008-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine, Equipment and accessories, Transmission and driveline, Automatic transmission, Software, Transmission control module

## Trouble codes named

P0300, P0306, P0420, P0430, P219A, P219B

## Vehicles listed

- 2018 to 2019 HONDA ODYSSEY
- 2017 to 2019 HONDA PILOT
- 2017 to 2019 HONDA RIDGELINE

## Recalls for the same vehicles and component

- [20V440000](/recalls/nhtsa/20V440000.md), 2020-07-28: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA; ELECTRICAL SYSTEM:SOFTWARE
- [20V439000](/recalls/nhtsa/20V439000.md), 2020-07-28: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA; ELECTRICAL SYSTEM:SOFTWARE
- [19V299000](/recalls/nhtsa/19V299000.md), 2019-04-12: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [A23\-073](/bulletins/10242219.md), 2023-09-13, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN. Service Bulletin \- The vehicle's transmission temperature can become too hot due to automatic transmission fluid deterioration causing high foaming and low viscosity. During extended high load driving, the automatic transmission fluid will foam and cooler flow rate is reduced.
- [A23\-078](/bulletins/10241879.md), 2023-09-06, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER; ENGINE AND ENGINE COOLING. 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 DTC P0741 Torque Converter Clutch Circuit Performance or Stuck OFF.
- [ABOM01062023](/bulletins/10229678.md), 2023-01-11, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM. Dealer Message \- During development, the idle stop enable criteria was mis\-set allowing idle stop to improperly engage while battery health is low. Under certain circumstances, after coming to a stop and engaging idle stop, the vehicle may not automatically restart. In most cases, the client can immediately restart the vehicle by selecting Park and pushing the Start button.
- [A23\-009](/bulletins/10229676.md), 2023-01-11, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR; ELECTRICAL SYSTEM:SOFTWARE. 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. NOTE: If 23\-008 Product Update: PGM\-FI Idle Stop Software Update is applicable to the VIN, the PGM\-FI software must be updated first before the warranty extension applies. Honda is extending the warranty coverage for valve adjustment and starter replacement related to this condition to 10 years from the original date of purchase with no mileage limitation.
- [A23\-008](/bulletins/10229675.md), 2023-01-11, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR. Service Bulletin \- Under certain circumstances, after coming to a stop and the idle stop feature engages, the vehicle may not automatically restart. Typically, the customer can immediately restart the vehicle by selecting Park and pushing the ENGINE START/STOP button.
- [A22\-010](/bulletins/10215485.md), 2022-07-07, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; STRUCTURE; VISIBILITY. Service bulletin \- When activating the sliding door power window auto\-up feature, the window rolls up halfway and then rolls back down. There could be a pinch detection software compatibility issue between the power window regulator control unit and the rear window switch.
- [A22\-001](/bulletins/10206997.md), 2022-02-04, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Service Bulletin \- On February 22, 2022 the current 3G network that the vehicle connects to for services, will no longer be in\-service. The Telematics Control Unit \(TCU\) Over the Air Update \(OTA\) is required to connect to the VoLTE network to continue communications.
- [A17\-090](/bulletins/10201205.md), 2021-09-09, Service bulletin: VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; VISIBILITY; ELECTRICAL SYSTEM:SOFTWARE. Service Bulletin \- Under certain conditions, the rear window switch internal software enters an unstable condition and cannot recover, making the window switch inoperable.
- [A20\-100](/bulletins/10187006.md), 2021-02-18, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING. "Service Bulletin \- The PCM software may misinterpret sensor inputs as a deteriorated catalytic converter. Additionally, debris from the high pressure pump or the fuel injector machining process can cause internal wear or clogging inside one or more injectors. One or more of the following DTCs may be stored: \- P0420 \(rear bank catalyst system efficiency below threshold \[bank 1\]\) \- P0430 \(front bank catalyst system efficiency below threshold \[bank 2\]\) \- P0300\-P0306 \(misfire\) \- P219A \(air\-fuel ratio variation of cylinder \[bank 1, rear bank\]\) \- P219B \(air\-fuel ratio variation of cylinder \[bank 2, front bank\]\) American Honda is extending the warranty on these repairs to 10 years from the original date of purchase or 150,000 miles, whichever comes first."
- [A19\-072](/bulletins/10183516.md), 2020-12-02, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). "Service Bulletin \- The MIL comes on with DTC P0430 \(front bank catalyst system efficiency below threshold \[bank 2\]\). Additionally, one or more of the following DTCs may also be stored: \-P030X \(misfire\) \-P219A \(air\-fuel ratio variation of cylinder \[bank 1, rear bank\]\) \-P219B \(air\-fuel ratio variation of cylinder \[bank 2, front bank\]\)"

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