2013 Ford F150 Output Shaft Speed Sensor Location
The output shaft speed sensor (OSS) on a 2013 Ford F-150 is located internally within the transmission, specifically mounted on the molded lead frame assembly above the valve body. Accessing this sensor requires removing the transmission fluid pan and the internal filter to reach the electronic connector plate. This guide explains how to find and replace this critical component to fix shifting and speedometer issues.
If you are driving your truck and the speedometer suddenly drops to zero or the transmission downshifts violently into first gear, you are likely dealing with a sensor failure. These symptoms are common for owners of this specific model year, and it often points back to one specific electronic component deep inside your gearbox.
I have spent years under these trucks, and I know how frustrating it is when a 2013 ford f150 output shaft speed sensor location isn’t clearly visible from the outside. In this guide, I will walk you through exactly where this sensor is hidden and how you can tackle the repair in your own garage.
By the end of this article, you will understand why this sensor fails, how to diagnose it using trouble codes, and the precise steps needed to get your F-150 back on the road safely. Let’s dive into the mechanical heart of your Ford’s drivetrain.
Understanding the 2013 ford f150 output shaft speed sensor location
Most vehicle sensors are mounted on the exterior of the engine or transmission housing for easy access. However, the 6R80 transmission found in the 2013 Ford F-150 uses an internal molded lead frame design. This means the electronics are bathed in transmission fluid.
The 2013 ford f150 output shaft speed sensor location is at the very rear of this lead frame, positioned directly over the output shaft gear. It is not a standalone part that you can simply unscrew from the side of the transmission case. Instead, it is integrated into a plastic bridge that connects several sensors to the main wiring harness.
To see the sensor, you must drain the transmission fluid and remove the bottom pan. Once the pan and the plastic fluid filter are out of the way, you will see the large silver valve body. The lead frame, which houses the OSS, is the black plastic component bolted to the top of that valve body.
The Role of the OSS in Your Drivetrain
The Output Shaft Speed (OSS) sensor acts as the “eyes” of the Powertrain Control Module (PCM). It measures the rotational speed of the output shaft to determine vehicle speed and help the computer decide when to shift gears. When this sensor fails, the truck’s computer loses its sense of how fast you are going.
Because the 2013 ford f150 output shaft speed sensor location is internal, it is subjected to constant heat and debris within the transmission fluid. Over time, tiny metallic particles can accumulate on the magnetic tip of the sensor, or the internal circuitry of the lead frame can crack, leading to intermittent signal loss.
OSS vs. TSS: Don’t Confuse the Two
It is important to note that your transmission has two primary speed sensors. The Turbine Shaft Speed (TSS) sensor measures the input speed from the engine, while the OSS measures the speed going out to the wheels. Both are located on the same internal lead frame, but the OSS is the one closest to the rear of the truck.
Common Symptoms of a Failing Speed Sensor
Identifying a bad sensor early can save you from a dangerous situation on the highway. Because the 2013 ford f150 output shaft speed sensor location is tied to the shifting logic, a failure usually results in very noticeable performance “hiccups.”
One of the most terrifying symptoms is an uncommanded downshift. If the OSS signal drops to zero while you are cruising at 60 MPH, the PCM might think the truck has stopped and try to shift into 1st gear. This can cause the rear wheels to lock up momentarily, which is why Ford issued significant recalls for this specific issue.
Other common signs include the “Wrench Light” appearing on your dashboard, the speedometer needle bouncing or staying at zero, and the transmission entering “Limp Mode.” In Limp Mode, the truck will often stay in 3rd or 5th gear to prevent further mechanical damage while allowing you to drive to a shop.
Diagnostic Trouble Codes (DTCs) to Watch For
Before you go searching for the 2013 ford f150 output shaft speed sensor location, you should always scan your truck for codes. An OBD-II scanner is your best friend here. Look specifically for codes in the P0720 to P0723 range.
- P0720: Output Shaft Speed Sensor Circuit Malfunction.
- P0721: OSS Sensor Circuit Range/Performance issue.
- P0722: OSS Sensor Circuit No Signal.
- P0723: OSS Sensor Circuit Intermittent.
If you see these codes, it confirms that the problem is electrical and likely located on the lead frame. If you see codes related to gear ratios (like P0731 or P0732), you might be dealing with a mechanical clutch failure rather than just a sensor issue.
The Ford Lead Frame Recall: What You Need to Know
Before you spend money on parts, you must check if your truck is covered under the 19V-446 recall or the extended warranty coverage (19N01). Ford recognized that the 2013 ford f150 output shaft speed sensor location and design were prone to failure, causing safety risks.
In many cases, Ford dealerships will replace the lead frame for free if your truck meets the mileage and age requirements. Call your local dealer with your VIN (Vehicle Identification Number) handy. They can tell you instantly if there is an open “Customer Satisfaction Program” for your specific F-150.
If you are outside the warranty period, or if you prefer to do your own work to ensure it is done to your standards, you can buy the updated lead frame part. Always ensure you are buying the updated version (Part Number: AL3Z-7G276-D or newer) to prevent the problem from returning.
Essential Tools for Accessing the OSS Sensor
Since the 2013 ford f150 output shaft speed sensor location is internal, this isn’t a “five-minute” job. You will need a clean workspace and the right tools to avoid contaminating the sensitive hydraulic valves inside the transmission.
You will need a 10mm socket for the pan bolts and an 8mm socket for the lead frame bolts. A T30 Torx bit is often required for the internal heat shield or specific valve body components. I also highly recommend a high-quality torque wrench that reads in inch-pounds, as the internal bolts are very delicate.
Cleanliness is the most important “tool” in this job. Even a tiny piece of lint from a shop rag can clog a solenoid and ruin your transmission. Use lint-free towels and plenty of brake cleaner to keep the area spotless before you open the transmission case.
Required Parts and Supplies
- Updated 6R80 Molded Lead Frame.
- New Transmission Filter (Screen).
- Replacement Pan Gasket (though the factory one is often reusable).
- 8 to 10 quarts of Mercon LV Automatic Transmission Fluid.
- A large drain pan capable of holding at least 8 quarts.
Step-by-Step Replacement Guide
Now that you know the 2013 ford f150 output shaft speed sensor location is inside the case, let’s look at the process of getting to it. This job takes an experienced DIYer about 3 to 4 hours to complete.
1. Draining the Fluid
Start by securing the truck on jack stands or a lift. The 2013 F-150 usually does not have a drain plug on the transmission pan. You will need to slowly loosen the pan bolts, leaving a few in the corners, to let the fluid tilt and drain into your catch pan. It is a messy job, so have plenty of cardboard or drop cloths on the floor.
2. Removing the Pan and Filter
Once the fluid has slowed to a drip, remove all the bolts and pull the pan down. You will see the plastic filter held in by tension and an O-ring. Pull the filter straight down. Be prepared for another pint of fluid to splash out when the filter neck clears the bore.
3. Disconnecting the Bulkhead Connector
On the passenger side rear of the transmission, there is a large round electrical connector. You must slide the white locking tab down and pull the harness out. Then, unscrew the 19mm plastic nut (or use the internal lever) to release the bulkhead sleeve. This sleeve passes through the case and connects directly to the lead frame.
4. Dropping the Valve Body
To reach the 2013 ford f150 output shaft speed sensor location, you must remove the valve body. There are approximately 11 bolts (usually 8mm) holding the valve body to the transmission case. Support the valve body with one hand as you remove the final bolts. It is heavy and contains several small check balls and springs that must stay in place.
5. Swapping the Lead Frame
Once the valve body is on your workbench, you can unclip the old lead frame. The OSS is the sensor at the rear. Simply pull the old frame off and snap the new one into place. Ensure all the solenoid terminals line up perfectly with the new lead frame connectors. This is where the exact 2013 ford f150 output shaft speed sensor location becomes clear as it seats over the output gear window.
Reassembly and Fluid Refill
Reverse the steps to reinstall the valve body. Tighten the bolts in a cross-pattern to 80 inch-pounds. Do not over-tighten them, or you risk stripping the aluminum threads in the transmission case. Reinstall the bulkhead sleeve, ensuring the seals are lubricated with a bit of fresh fluid.
Install the new filter and the pan. If the reusable gasket is free of nicks or tears, you can wipe it down and use it again. Torque the pan bolts to 106 inch-pounds. Now comes the tricky part: refilling the fluid. The 2013 F-150 uses a small dipstick located under a 19mm cap on the passenger side of the transmission case, right next to the exhaust.
Fill the transmission with about 6-7 quarts of Mercon LV, start the engine, and let it reach operating temperature (190°F to 200°F). Check the level while the engine is idling and add fluid until it reaches the “B” or “Hot” mark on the mini-dipstick. Be careful, as the exhaust pipe is extremely hot and sits inches away from the fill hole.
Safety Precautions and Expert Tips
Working on a transmission is a high-stakes DIY project. Always use heavy-duty jack stands and never rely on a floor jack alone. If the truck shifts while you are underneath it, the consequences can be fatal. I always recommend chocking the wheels and having a second person nearby.
A “pro tip” for this job is to use a fluid transfer pump. Since there is no dipstick tube under the hood, you have to pump the fluid up into the side of the transmission from underneath. A cheap hand pump from the auto parts store will make this much easier and cleaner.
Another tip: Check the “bridge seal” (the rectangular rubber seal between the valve body and the case) while you have everything apart. These seals are known to flatten over time, causing internal pressure leaks. Replacing it while you are already at the 2013 ford f150 output shaft speed sensor location is cheap insurance against future shifting problems.
Frequently Asked Questions About 2013 ford f150 output shaft speed sensor location
Can I clean the OSS sensor instead of replacing it?
While you can wipe metallic fuzz off the sensor, it usually doesn’t solve the problem. Most failures in the 2013 model are due to internal circuit cracks in the lead frame itself. Since the labor to get to the sensor is so intensive, it is much smarter to replace the entire lead frame with the updated version.
How much does it cost to fix the OSS sensor at a shop?
If you take your truck to a mechanic, expect to pay between $600 and $1,000. This includes the part (around $200-$300), 10 quarts of fluid, a filter, and 3-4 hours of labor. If you do it yourself, you can get the job done for about $350 in parts and supplies.
Will a bad OSS sensor cause the truck to stay in 1st gear?
Yes, it can. If the PCM doesn’t know how fast the output shaft is spinning, it may refuse to upshift to protect the transmission. Alternatively, it might go into “Limp Mode,” which limits you to a single gear (usually 3rd or 5th) to allow you to drive to a safe location.
Is the 2013 ford f150 output shaft speed sensor location the same on 4WD models?
Yes, the 2013 ford f150 output shaft speed sensor location remains the same regardless of whether you have 2WD or 4WD. The sensor is inside the main transmission case, which is identical on both platforms. The only difference is that 4WD models have a transfer case bolted to the rear of the transmission.
Summary of the Fix
Replacing the speed sensor in your F-150 is a significant task, but it is well within the reach of a dedicated DIYer. By understanding that the 2013 ford f150 output shaft speed sensor location is tucked away on the internal lead frame, you can approach the repair with the right mindset and tools.
Remember to check for recalls first, keep your workspace surgically clean, and always use the correct Mercon LV fluid. Taking the time to fix this properly will not only restore your truck’s drivability but also ensure your safety on the road by preventing sudden, dangerous downshifts.
Stay patient, follow the torque specs, and don’t be afraid to get your hands a little oily. Your F-150 is a workhorse, and with a new lead frame, it will be ready for many more miles of adventure. Stay safe and happy wrenching!
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