B1370
Device Ignition 1 Circuit Malfunction
What it means
B1370. Device Ignition 1 Circuit Malfunction. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, HHR, Malibu.
Findings, check these first
- Open or short to ground in the ignition 1 voltage circuit to the SDM
- Blown AIR BAG fuse in the underhood fuse block
- Corroded underhood fuse block terminals breaking ignition feed to the module
- Aftermarket wiring taps spliced into the ignition 1 circuit
Standard procedure
- Check the AIR BAG fuse and test for 9-16 volts at the fuse supply side with ignition on
- Test the ignition 1 voltage circuit between the fuse center and the module for opens or shorts
- Remove any aftermarket splices in the ignition feed wiring and restore the harness
- Inspect fuse block terminals for corrosion, especially in rust-belt trucks
- Replace the SDM only if all circuit tests pass; SRS circuits should be handled by a qualified technician
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Sources and review
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Last updated 2026-09-25.
Report a correction for B1370. Include your vehicle, the issue and a source if you have one.