# Service bulletin A23\-078

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: 10241879
- Published by NHTSA: 2023\-09\-06
- Manufacturer's number: A23\-078
- Manufacturer's date: 2023\-08\-31
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER; ENGINE AND ENGINE COOLING

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10241879-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10241879-9999.pdf)

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

## Components

Engine, Transmission and driveline, Automatic transmission, Torque converter

## Trouble codes named

P0741

## Vehicles listed

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

## 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.
- [A21\-010](/bulletins/10187008.md), 2021-02-18, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); 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."
- [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 \[bank 2, front bank\]\)"
- [AVE02142018901](/bulletins/10129336.md), 2018-02-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER. Dealer message \- Every Service Bulletin requires you to take an HDS snap shot and use the job aid or Tech2Tech to confirm the judder/shudder is coming from the torque converter.
- [Customer Letter](/bulletins/10119599.md), 2017-10-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. Customer letter \- On a limited number of 2016?17 Pilot vehicles, the 9\-speed automatic transmission fluid \(ATF\) warmer may leak internally. If the ATF warmer leaks, you may notice one or more of the following symptoms: ? The vehicle overheats. ? The transmission shifts poorly. ? The transmission makes noise during shifting.
- [Customer Letter](/bulletins/10119598.md), 2017-10-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. Customer letter \- Your 2016 or 2017 Pilot previously had the transmission replaced because of a leaking 9\-speed automatic transmission fluid \(ATF\) warmer. As the issue was under investigation when the transmission was replaced, your vehicle needs further action before it is completely repaired.
- [A17\-036](/bulletins/10118004.md), 2017-09-27, Service bulletin: ENGINE; 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 \[Bank 2\]\). The PCM software may misinterpret sensor inputs as a deteriorated catalytic converter.
- [A17\-035](/bulletins/10117329.md), 2017-09-14, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE AND ENGINE COOLING. Service bulletin \- American Honda is extending the warranty on the 9\-speed transmission warmers to 10 years from the original date of purchase with unlimited mileage. This warranty covers vehicles where the engine coolant and ATF mix because of an internal leak in the 9\-speed transmission warmer.
- [A17\-011](/bulletins/10117328.md), 2017-09-14, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE AND ENGINE COOLING. Service bulletin \- Some 9\-speed transmission warmers were improperly manufactured and allow the engine coolant and ATF to mix. If the fluids mix, the engine and transmission may be permanently damaged and require replacement. These vehicles previously had the transmission replaced because the transmission warmers leaked. In rare cases, these vehicles may have also overheated but because the issue was under investigation, a standard repair procedure hadn't been developed. Further action is needed before the vehicle is completely repaired.

JSON: [/v1/bulletins/10241879](/v1/bulletins/10241879)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20A23-078&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10241879&vehicle=Service%20bulletin%20A23-078)