Interchanges & supersessions: 13587326 (GM), superseded by 19370459 on some applications; related GM numbers seen in dealer catalogs: 19179953, 84581346; equivalent catalog reference PT2929 (connector/pigtail kit). Verify by connector shape (2-way female with leads) and SI codes B20/B34/B203/Q12.
Common host components using this 2-way pigtail (examples by SI codes & OE numbers): Coolant temperature sensors (B34/B34A-E/B203): GM 12641073, 12656444, 55497116 (varies by engine/EV system). Brake fluid level switch (B20): uses this 2-way pigtail in multiple GM platforms incl. Silverado HD. EVAP canister purge solenoid (Q12): GM 55509566, 12656577, 12632174, 12666845 (model-dependent). Engine oil level indicator switch (B35): GM 12696433/12696434/12696435 (family). Engine oil pressure control solenoid (Q44) & camshaft position actuator solenoid – exhaust (Q6E): listed in ACES notes for recent Cadillac/Chevy apps.