Code Definition

P0860 — Gear Shift Module Communication signal high - Circuit B

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0860

P0860 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0860 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0860 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0860 fault code is set when the vehicle's control module detects a high voltage condition in the communication signal of Gear Shift Module, specifically in Circuit B. This indicates that the voltage level of the signal sent from or within the gear shift module is higher than the expected range. Such a condition could be due to an electrical issue, like a short to power, in the gear shift module's communication circuit. This high voltage signal can disrupt the normal communication and functioning of the gear shift module, potentially affecting gear selection and transmission operation.

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