48RE Transmission Throttle Valve Actuator 53041140AB

The TTVA is the little electric motor bolted to the driver side of the 48RE case that pulls the throttle valve lever. On the older 47RE the throttle valve was cable-operated off the injection pump; when Dodge went to the electronic VP44 and common-rail Cummins there was no cable to pull, so the TCM drives this actuator instead. Whatever position it commands is what the valve body sees as throttle load, and that is what sets line pressure and shift firmness. When the actuator gets lazy or its internal position sensor drifts, line pressure drops and the trans slips on the 1-2 and 2-3 under load, or it goes the other way and bangs shifts hard at light throttle.

Typical failure shows up as codes P1756, P1757 or P1764 for governor and throttle valve position circuit, sometimes with the truck dropping into limp. A 48RE that slips only when hot and towing, or that will not build enough pressure to hold the overdrive clutch, is worth checking here before anyone pulls the pan. The unit is externally mounted, so it comes off with two bolts and a connector, no fluid drain and no valve body removal.

Fits Dodge Ram 2500 and 3500 with the 48RE automatic behind the 5.9L Cummins from 2003 through 2007, and the 6.7L Cummins from 2007 through 2009. Replaces OE 53041140AB and crosses to 609-045, TH463, 214-3403 and D22460G. Six-terminal female oval connector, direct fit, no mounting hardware included. When you install it, make sure the actuator lever engages the throttle valve shaft before you torque it down, and let the TCM relearn before judging shift quality.