2014 Ram 1500 Transmission Speed Sensor Location

Where the speed sensors are located

On a 2014 Ram 1500 with the six-speed 65RFE automatic, both speed sensors mount on the outside of the transmission case on the driver's side. The input speed sensor is toward the front of the case, closer to the bell housing. The output speed sensor is toward the rear, near where the case meets the extension housing or the transfer case adapter on four-wheel-drive trucks. Each sensor has its own electrical connector and is held in place by a single fastener, and both are reached from underneath the vehicle.

Most 2014 Ram 1500 trucks, however, use the eight-speed automatic, which was paired with the V6, the EcoDiesel and many Hemi V8 trucks. On that transmission, input and output speed sensing is built into the mechatronic assembly, the combined valve body and transmission control module that sits inside the oil pan. There is no separate bolt-on speed sensor on the outside of the case to unplug and swap. On an eight-speed truck, the answer to where the speed sensor is located is inside the transmission, reachable only by removing the pan and internal components.

How the transmission speed sensors work

The input sensor reads how fast the input or turbine shaft is turning, and the output sensor reads how fast the output shaft is turning. Each sensor detects the passing teeth of a toothed wheel or ring and sends a pulsing signal to the transmission controller. By comparing the two speeds, the controller calculates the actual gear ratio, confirms that a shift has completed, monitors torque converter slip and adjusts how firmly future shifts are applied.

When one of these signals drops out or no longer makes sense compared with the other, the controller stores a fault and may hold the transmission in a fixed gear to protect it. Other modules on the truck also rely on wheel speed data from the anti-lock brake sensors. A speed-related complaint, such as an erratic speedometer, can therefore start outside the transmission entirely.

What changes the answer

Transmission type is the main variable. On this generation of Ram 1500, a rotary gear selector dial on the dashboard indicates the eight-speed automatic, while a column-mounted shift lever indicates the six-speed. Engine size alone is not a reliable guide, because Hemi trucks from this period could be built with either transmission. If the shifter is not conclusive, confirm the transmission from the window sticker, build documentation or a dealer lookup by VIN.

Drivetrain and equipment also affect the job. On four-wheel-drive six-speed trucks, the transfer case, skid plates, exhaust routing and heat shields can crowd the output sensor and make access harder than on two-wheel-drive trucks. Fluid specification differs too. The 65RFE uses ATF+4 and has a dipstick. The eight-speed requires its own dedicated fluid and is checked through a fill-plug procedure at a specified temperature. Fitment matters when shopping, because a part listed for a 2014 Ram 1500 may fit only one of the two transmissions.

What the owner can do

Start with a scan tool that can read the transmission module, not only generic engine codes. Diagnostic codes commonly tied to these sensors include P0715 for the input or turbine speed sensor circuit, P0720 for the output speed sensor circuit and P0500 for vehicle speed sensing. Save any freeze-frame data and note the shift behavior: harsh or delayed shifts, flaring between gears, a truck stuck in one gear, or a speedometer that drops out. A code identifies a circuit or signal problem. It does not prove that the sensor itself has failed, because damaged wiring, a loose or corroded connector, low or contaminated fluid and controller faults can set the same codes.

On a six-speed truck, inspect both connectors and their harness along the driver's side of the transmission. Look for broken locking tabs, fluid inside the connector, corrosion, and wiring that has chafed or melted near the exhaust. Check fluid level and condition using the correct procedure. If testing points to the sensor, replacement is usually a manageable job. Unplug the connector, remove the fastener and install the new sensor with a fresh seal, then expect a small amount of fluid loss and top off as needed. Afterward, clear the codes and road test to confirm the fault does not return.

On an eight-speed truck, owner-level checks are limited to reading codes, inspecting the external harness and connector at the transmission, and having fluid level verified correctly. Repair options range from a software update or adaptation relearn to replacement of the mechatronic assembly, which typically requires programming with dealer-level equipment. Gather the service history before deciding, including past fluid services and any software updates. Ask a dealer whether any service updates apply to the specific VIN.

Limitations and next step

This article describes the general sensor layout for each transmission. Production changes, mid-year revisions and repair history can alter details on an individual truck. Confirm the exact sensor position, connector and part number in service information for your VIN before ordering anything. Intermittent wiring faults can come and go, so a new sensor that seems to fix the problem may only coincide with a connector being disturbed during installation.

Professional help is the sensible next step if the truck has the eight-speed, if a code returns after a sensor or wiring repair, if the transmission enters a protective mode while driving, or if you are unsure of the fluid check procedure. A transmission shop can watch live input and output speed data while the truck runs and shifts. That shows whether a signal is actually missing or implausible, so the repair targets the confirmed cause rather than the first suspected part.