Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Column Lock PCM-BCM COM

The scan tool displays Fault or OK. The PCM disables fuel when a Serial data communication malfunction occurs between the PCM and the BCM. The engine will start and idle. When the vehicle reaches 1.5 mph the PCM disables fuel. This occurs because the status of the column lock position is unknown.