Code Definition

B1370 — Ignition Tach Circuit Short To Ground

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1370

B1370 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1370 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1370 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC B1370 is set by the Body Control Module when it detects the ignition tach signal circuit is being held at ground rather than switching with each ignition event. The tach line carries a square wave from the powertrain control module or ignition module, and the BCM relies on this signal for the tachometer display and for any speed dependent body functions such as auto door lock, intermittent wiper interval, and antitheft cranking authority. With the line shorted to ground, the input cannot rise to its expected high state during ignition events, so the BCM sees no transitions, the tachometer ...

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