43880 - service update. for vehicles equipped with a start/stop engine control option (rpo KL9), the...

Bulletin number

43880

Component

Electrical system: 12v/24v/48v battery

Summary

43880 - service update. For vehicles equipped with a start/stop engine control option (rpo kl9), the system level interactions related to the transition of run/crank and accessory inputs to the engine control module (ECM) during a crank event are compromised. This results in communication issues between the ECM and the intelligent battery sensor. The check engine light will illuminate and the start/stop system is suspended while the fault is active, resulting in degraded fuel economy. Dealers are to reprogram the engine control module.

Owners of these vehicles have filed 238 complaints in the electrical category.