Service bulletin 11-185-18

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.

NHTSA's summary

This bulletin announces availability of reprogramming files to optimize the Battery Energy Control Unit (BECU) which is a component part of the HEV battery pack. The new files address the BECU logic used for detection of the HEV battery pack temperature. After the engine is shut off, the battery pack generates a certain amount of self-discharge heat by design. Existing BECU logic uses a threshold for the amount of this heat which is too low. As a result, the Hybrid Motor Assist Regeneration (HEV battery recharge) system and Auto Start Stop features stop operating. In addition to these reprogramming files to address this condition, a design change was made to the replacement battery pack in support of this software update.

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

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, 12-volt battery

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

• Bulletins for another vehicle
• Report an error on this page
• Report an error by email