MG
Moderator
Please see T-SB-0001-18 Revision 2
2017-2018 Toyota Highlander
2017-2018 Toyota Sienna
When completing a transaxle assembly replacement, Engine Control Module (ECM) (SAE term:
Powertrain Control Module [PCM]) replacement, or ECM (PCM) reprogram, ensure the correct
ECM (PCM) software is matched with the transaxle assembly hardware. Some 2017 – 2018
model year Highlander and 2017-2018 model year Sienna vehicles require different ECM (PCM)
software based on the transaxle assembly hardware installed in the vehicle.
See this Post for help with locating the Transmission Serial Number...
NOTICE
Mismatched transaxle assembly hardware and ECM (PCM) software combinations may result
in a harsh shift or shift flare. If this occurs, ECM (PCM) replacement and reprogramming will be
required. If ECM (PCM) replacement/reprogramming is needed, it will not be covered
under warranty.
Use the information in Service Bulletin T-SB-0001-18 Revision 1 to confirm that the correct ECM (PCM) hardware and
software are used based on the transaxle assembly part number and serial number.
2017-2018 Toyota Highlander
2017-2018 Toyota Sienna
When completing a transaxle assembly replacement, Engine Control Module (ECM) (SAE term:
Powertrain Control Module [PCM]) replacement, or ECM (PCM) reprogram, ensure the correct
ECM (PCM) software is matched with the transaxle assembly hardware. Some 2017 – 2018
model year Highlander and 2017-2018 model year Sienna vehicles require different ECM (PCM)
software based on the transaxle assembly hardware installed in the vehicle.
See this Post for help with locating the Transmission Serial Number...
NOTICE
Mismatched transaxle assembly hardware and ECM (PCM) software combinations may result
in a harsh shift or shift flare. If this occurs, ECM (PCM) replacement and reprogramming will be
required. If ECM (PCM) replacement/reprogramming is needed, it will not be covered
under warranty.
Use the information in Service Bulletin T-SB-0001-18 Revision 1 to confirm that the correct ECM (PCM) hardware and
software are used based on the transaxle assembly part number and serial number.