Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

B1370 01

Ignition 1 voltage circuit is shorted to voltage.

B1370 06

Ignition 1 voltage circuit is open.
B+ circuit of the ignition switch open or shorted to ground.

B1380 01

Accessory voltage circuit is shorted to voltage.

B1380 06

Accessory voltage circuit is open.
B+ circuit of the ignition switch open or shorted to ground.

B1440

BCM senses an open or short to voltage on the off/run/crank voltage circuit when both ignition accessory/run and ignition run/crank parameters are active.

BCM senses an open on the B+ circuit to the ignition switch while the engine is running. An open on the B+ circuit can be caused by a short to ground on any of the circuits listed below:

B+
Accessory voltage
Run/crank ignition 1 voltage BCM terminal 19, X4
Off/run/crank voltage

B1441 01

Off/run/crank voltage circuit is shorted to voltage.

B1441 06

Off/run/crank voltage circuit is open.