P0760

P0760 indicates an electrical fault in the Shift Solenoid C circuit (3-4 shift on many transmissions, lockup or 2-3 on others depending on application). The PCM detects an open, short to power, or short to ground in the solenoid driver circuit and typically commands a limp-home state with fixed gear engagement. Start with the cheapest checks: scan for companion codes (P0765 often appears with internal harness failure), inspect the external transmission connector for fluid wicking up the wires (a classic sign of failed internal case connector seal), then back-probe the solenoid feed at the case connector with the key on and measure resistance to the solenoid body. Typical resistance specs are 19 to 31 ohms on GM 4L60E/4L65E shift solenoids at room temperature, 9 to 16 ohms on Ford 4R75W/4R75E units, and 11 to 15 ohms on Chrysler 45RFE/545RFE solenoid block units. Anything reading infinite (open), under 5 ohms (shorted), or wildly out of spec when hot points to the solenoid; an in-spec reading with the code still setting shifts suspicion to the harness, internal case connector, or TCM driver. Caveat: ATF-contaminated external harnesses can wick fluid all the way to the TCM and destroy the driver, so always inspect and seal the case connector before installing a new solenoid or you will burn the replacement.

Vehicle-specific patterns: 2003 to 2007 Chevrolet Silverado/Tahoe with 4L60E/4L65E commonly fail the 1-2 and 3-4 shift solenoids together due to debris from a worn 3-4 clutch pack contaminating the solenoid screens, and GM TSB 04-07-30-009 covers updated solenoid kits. 2004 to 2008 Ford F-150 with 4R75W trips P0760 from the internal wiring harness chafing on the case rib near the solenoid body, requiring a new internal harness rather than just the solenoid. 2005 to 2010 Honda Odyssey with the 5-speed (BGRA/BYBA) sets P0760 from the linear shift solenoid B failing electrically, and Honda issued multiple service news bulletins for the updated linear solenoid assembly. 2007 to 2012 Nissan Altima with the RE0F10A CVT will flag P0760 equivalents when the step motor or pressure solenoid valve body assembly fails, almost always requiring full valve body replacement. Estimated repair: $180 to $850.