P0862 Gear Shift Module Communication Circuit High

P0862 points to a high gear shift module communication circuit. The communication path is above range, open, or shorted to voltage.

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 condemn the transmission controller until the high communication circuit fault is isolated.

Useful checks before replacing parts

Measure communication circuit voltage, check for short-to-voltage faults, open grounds, connector corrosion, and module power issues.
Confirm shifter module presence on the network and compare gear selector data with the instrument cluster and transmission controller.
Inspect recent console work, water entry, spilled liquids, or wiring repairs that could affect the shifter communication circuit.

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.