Conditions for Setting the DTC

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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.