P0874 Transmission Fluid Pressure Sensor/Switch C Circuit Intermittent

P0874 points to an intermittent transmission fluid pressure sensor or switch C circuit fault. The C pressure signal is unstable only under certain conditions.

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 hydraulic parts until the intermittent pressure sensor C circuit has been stressed and tested.

Useful checks before replacing parts

Graph pressure sensor C data while repeating freeze-frame load, temperature, and shift conditions to catch dropouts or spikes.
Inspect pressure sensor C connector, internal harness, case connector terminals, shared reference, ground, and fluid intrusion.
Compare sensor C behavior with pressure-control commands, shift timing, slip, and companion pressure sensor codes.

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.