Toyota 89663-04B23 Engine Control Calibration

Toyota 89663-04B23 is an engine control calibration associated with the powertrain control module. Its catalog identifier appears in Toyota service records as 8966304B2300. The engine controller manages combustion and related diagnostic functions that affect how the vehicle runs and how faults are reported.

Toyota lists this calibration as an updated version in service bulletins covering the 2016–2018 Tacoma. One of those bulletins addresses a specific warning-light condition, providing a useful distinction between the controller’s general role and the issue addressed by the service revision.

Malfunction indicator light and P261093

In Toyota Service Bulletin T-SB-0013-19, calibration 8966304B2300 is listed as an updated calibration for a condition involving the malfunction indicator light and diagnostic trouble code P261093. P2610 concerns the engine control module’s internal engine-off timer performance. That timer helps the controller track engine-off time for functions that depend on operating and diagnostic conditions.

In practical terms, the bulletin relates to an engine warning light and a stored timer-related fault. The bulletin identifies this calibration as an update for the documented condition, but it does not establish that every vehicle carrying the calibration has experienced the fault.

Reading the Toyota service record

Toyota also lists 8966304B2300 as an updated calibration in T-SB-0119-18, a bulletin covering the 2016–2018 Tacoma. The available record does not identify that bulletin’s specific service topic, so it should not be treated as evidence of another particular software change.

T-SB-0013-19 covers several Toyota models, including hybrid vehicles and the Tacoma. That is the scope of the bulletin as a whole, not proof that this individual calibration applies to every model listed. The full calibration ID and the vehicle’s service information are important when distinguishing this entry from other Toyota engine-control revisions.