46RE TCC Solenoid: How to Identify It and Where It Is Located
The 46RE is a four-speed, electronically controlled automatic used behind many gasoline V8 and V10 engines in Dodge Ram, Durango, Dakota and Jeep Grand Cherokee models. The torque converter clutch (TCC) solenoid controls converter lockup, but it is not a standalone part bolted to the outside of the case. This article explains where it is, how to recognize it, and how to confirm that the solenoid is actually the problem before buying parts.
Where the 46RE TCC solenoid is located
On the 46RE, the TCC solenoid is part of a combined solenoid assembly that also contains the overdrive solenoid. This assembly is mounted on the valve body inside the transmission, so it can only be seen and serviced after the oil pan is removed and the fluid is drained. From outside the vehicle, the only visible part of the circuit is the electrical connector for the solenoid assembly. On typical installations it plugs into the driver's side of the transmission case, above the pan rail.
Identification inside the pan is straightforward once you know what to look for. The overdrive and converter clutch solenoids sit together in one housing with a short internal harness that runs to the case connector. Do not confuse it with the governor pressure solenoid and governor pressure sensor. Those are separate components on the valve body that control shift timing rather than lockup. Replacement parts are usually sold as the complete OD/TCC solenoid assembly, often described as a solenoid pack, not as an individual converter clutch solenoid.
How the converter clutch solenoid works
The torque converter normally transmits power through fluid, which allows some slippage between engine and transmission. Once the vehicle is cruising in a higher gear, the powertrain control module energizes the TCC solenoid. The solenoid then directs hydraulic pressure through the valve body to apply the clutch inside the converter, which mechanically locks the engine to the transmission input. This lowers engine speed at cruise, reduces heat generated in the fluid and improves fuel economy.
The module decides when to apply and release lockup from inputs such as vehicle speed, throttle position, engine and transmission temperature, and the brake switch. Pressing the brake pedal normally releases lockup. For this reason, a faulty brake switch, a sensor problem or a wiring fault can produce lockup symptoms even when the solenoid itself is healthy.
What changes the answer for your vehicle
First confirm that the transmission really is a 46RE. The 42RE, 44RE and 47RE share a similar overall design and can look alike from under the vehicle, but they differ in duty rating, applications and internal parts. Badging, year and engine are only clues. The identification tag or stamping on the case, the build data and the parts lookup by VIN are more reliable. Solenoid assemblies and connectors also changed across model years, so fitment should be checked against the exact vehicle rather than assumed from the transmission name alone.
Service history matters just as much. Aftermarket or rebuilt valve bodies, shift kits and manual lockup switches can alter how the converter clutch is wired or controlled. Previous repairs may also have left a pinched internal harness or a mismatched part behind. If the transmission has been rebuilt, any paperwork that lists the valve body and solenoid used is worth finding before you start diagnosis.
What the owner can check
Start with the fluid. Check the level with the engine running and the fluid at operating temperature, following the procedure in the owner's manual. Note the color and smell. Chrysler specifies ATF+4 for these transmissions, but confirm the fluid specification for your vehicle before adding anything. Low or degraded fluid can disturb converter clutch apply and shift behavior without any electrical fault.
Next, read stored diagnostic codes with a scan tool that shows manufacturer-specific codes. P0740 points to a torque converter clutch circuit problem. P1740 is a Chrysler code commonly associated with TCC or overdrive solenoid performance. A code identifies a circuit or system to investigate, not a confirmed failed part. Then inspect the case connector for corrosion, fluid intrusion, bent terminals and damaged wiring, and look along the harness for chafing. Note the symptoms too: engine speed that stays higher than normal at steady highway cruise, or an engine that stumbles or stalls when coming to a stop, which can indicate lockup that does not release.
If you are equipped to go further, solenoid resistance and circuit tests can be performed at the case connector. Compare the results against the factory service specification for your model year rather than generic numbers. Replacing the solenoid assembly means draining the fluid, removing the pan and working on the valve body. It is a reasonable job for an experienced home mechanic with clean working conditions, a torque wrench and the correct gasket or sealant and fresh fluid.
Limitations and when to get professional help
A failure to lock up, or lockup that will not release, can come from the solenoid, the internal or external wiring, the connector, the brake switch, a sensor input, a sticking valve in the valve body, a worn converter clutch or the control module. Replacing the solenoid assembly on symptoms alone may not fix the problem. If codes return after a correct replacement, if the fluid shows heavy debris or burnt odor, or if lockup issues come with harsh or slipping shifts, a transmission specialist with factory-level diagnostic data is the better next step. Your repair options then range from a wiring repair to valve body service, converter replacement or a rebuild, and a proper diagnosis keeps you from paying for parts the transmission does not need.