P0815 Upshift Switch Circuit

P0815 indicates an upshift switch circuit fault. The manual upshift request input is missing, stuck, or electrically outside the expected range.

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 transmission hardware for a manual shift complaint until the upshift switch input is proven valid.

Useful checks before replacing parts

Compare upshift switch data with actual paddle, lever, or button operation and verify that each press changes module data cleanly.
Inspect switch contacts, clock spring or shifter wiring, connector fit, water intrusion, reference voltage, and ground path.
Check whether manual mode, gear display, downshift switch data, or shift inhibit symptoms appear with the fault.

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.