P0860 Gear Shift Module Communication Circuit

P0860 points to a gear shift module communication circuit fault. The controller cannot communicate reliably with the shifter or gear selector module.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Transmission
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the shifter module until power, ground, and network integrity have been tested.

Useful checks before replacing parts

Scan all modules for communication codes and check whether the gear shift module is online and reporting selector data.
Inspect shifter module power, grounds, network wiring, connector fit, water intrusion, and console wiring strain points.
Compare range, gear display, shift-lock, manual-mode, and start-inhibit behavior with communication status.

Related OBD-II codes

These nearby transmission entries can help compare wording and fault area. They may share the same verification status as the source database.