P0796

P0796 is a performance fault on Pressure Control Solenoid C — one of the linear (PWM) solenoids that varies hydraulic pressure for a specific clutch or band rather than just switching a circuit on/off. PCS solenoids modulate pressure proportionally to the duty cycle the TCM sends, and the TCM watches whether the resulting line or apply-pressure response matches the commanded value (often via a pressure-switch manifold or directly via a pressure sensor on newer trans). When commanded pressure doesn't produce expected pressure, P0796 sets. Cheapest cause first: fluid level low, aerating the pump, dropping pressure under load. Second cheapest: burnt or varnished fluid sticking the PCS valve in its bore — sometimes a fluid + filter service plus an aftermarket Lubegard or seal-conditioner additive will free a borderline-stuck valve and clear the code (ATRA shop tip). Next: gauge-tap line pressure to verify actual psi against TCM-commanded psi during the shift the PCS affects. A pressure delta of more than 15-20 psi commanded vs actual confirms a solenoid or valve-body issue; matched pressures point to a slipping clutch downstream of a healthy hydraulic circuit.

Vehicle-specific patterns: 2007-2013 GM Silverado/Sierra/Tahoe with the 6L80/6L90 throws P0796 most commonly from a failed PCS in the TEHCM — TEHCM replacement, $600-900 part, requires GM SPS programming and quick-learn after install. 2006-2010 Chrysler 300C/Charger with the 545RFE/65RFE throws P0796 alongside solenoid-pack codes when the underdrive or 2C clutch pressure-control circuit drops; solenoid pack replacement is the standard fix, $400-600. 2008-2014 Ford F-150 with the 6R80 throws P0796 from the main control valve body's pressure-control solenoid degradation — Ford sells a complete valve-body assembly with all solenoids preinstalled, $750-1,000 part. 2009-2015 ZF 8HP (Ram 1500, BMW 3/5 series, Jeep Grand Cherokee) throws P0796 from mechatronic sleeve oil migration into the TCM, killing the PCS driver — mechatronic rebuild only, $1,800-2,800. Estimated repair: $350 (fluid service + solenoid) to $3,000+ (8HP mechatronic).