P0722 on 2015-2020 Ford F-150: Output Speed Sensor Failure Causes and Fixes

What's Unique About the 2015-2020 Ford F-150

The 2015-2017 F-150s often used the 6-speed 6R80 automatic transmission, which is notorious for a specific weakness. The Output Speed Sensor (OSS) is integrated into a component inside the transmission called the molded lead frame. This plastic and metal circuit board is prone to developing cracks in its electrical connections over time due to heat cycles and vibration, leading to a loss of signal and the P0722 code. This issue was so common on earlier models that Ford issued recalls (like 19S07) and extended warranties (Customer Satisfaction Program 19N01), and the problem persists in this generation. Later models in this year range (2018-2020) more commonly feature the 10-speed 10R80 transmission, which has a different internal design and is less prone to this specific lead frame failure, though it has its own set of potential issues addressed by TSBs like 21-2315 for harsh shifting.

Symptoms You May Notice

• Sudden, harsh downshift into a low gear (often 1st) while driving
• Check Engine Light and/or Wrench Light are illuminated
• Speedometer behaves erratically or drops to zero
• Transmission is stuck in one gear (limp mode), often 3rd or 5th
🎬 See: Diagnosing an F150 in limp mode with codes P0720 and P0722
• Harsh, delayed, or erratic shifting
• Odometer displays dashes (----) instead of mileage
• Cruise control stops working
• Truck stalls or chokes out at idle
• Inability to shift out of first gear from a stop

Most Likely Causes

1. Failed Molded Lead Frame (6R80 Transmission) 🔴 High Probability → Shop Transmission Valve Body The 6R80 transmission's internal lead frame, which houses the OSS and other sensors, is a well-documented weak point. The plastic and metal construction can develop internal cracks in the circuitry from constant heat cycles and vibration, causing an intermittent or complete loss of the OSS signal.
   How to confirm: A professional technician will use a high-end scan tool to monitor the Output Shaft Speed (OSS) PID in live data. If the signal drops to zero intermittently while the vehicle is moving (confirmed by wheel speed sensors), the lead frame is the prime suspect. The presence of codes P0720, P0722, and P0731 together is a very strong indicator of lead frame failure, as noted in Ford's own service programs.
   Typical fix: Replace the molded lead frame assembly, which is located on the valve body inside the transmission. This service also requires replacing the transmission filter, pan gasket, bulkhead connector sleeve, and approximately 10-11 quarts of MERCON LV fluid.
   Est. part cost: $200-$450
2. Damaged Wiring or Connector ⚪ Low Probability The main transmission wiring harness can sometimes chafe against the passenger side exhaust manifold, causing a short or open circuit. This is less common than the lead frame failure but has been reported by owners.
   How to confirm: Visually inspect the wiring harness between the transmission and the PCM for any signs of melting, chafing, or corrosion, paying close attention to the area near the passenger side exhaust manifold. Check the large round bulkhead connector at the transmission for loose or corroded pins. A continuity test can be performed on the OSS sensor wires from the transmission connector to the PCM.
   Typical fix: Repair the damaged section of the wiring harness or replace the faulty connector.
   Est. part cost: $20-$100

Rare But Worth Checking

• Powertrain Control Module (PCM) Failure: → Shop Engine Control Module (ECM) This is very uncommon. The PCM should only be considered after all other possibilities, including the lead frame and wiring, have been definitively ruled out by a professional.

Diagnosis Steps

1. Connect a professional OBD-II scanner to confirm the P0722 code and check for any other related transmission codes, specifically P0720, P0731, or P1500.
2. Use the scanner's live data function to monitor the Output Shaft Speed (OSS) sensor signal while driving. Compare it to the wheel speed sensor data to see if the OSS signal is dropping out or is absent.
3. If the signal is faulty, the next step is to inspect the transmission's external wiring harness and the main bulkhead connector for any visible damage, corrosion, or loose pins, especially near the exhaust manifold.
4. If the external wiring is intact, the issue is almost certainly internal to the transmission.
5. The transmission pan must be removed to inspect the molded lead frame and its connector on the valve body.
6. Confirm the lead frame is the faulty component. If so, proceed with replacement, along with the filter, bulkhead sleeve, and fresh fluid.

Parts You'll Likely Need

• Transmission Molded Lead Frame (OEM #AL3Z-7G276-D) — This is the most common failure point for the P0722 code on the 6R80 transmission, as it contains the integrated OSS sensor that fails. Due to high demand, this part has been known to go on national backorder.
  Trusted brands: Motorcraft
  OEM price range: $200-$400
  Aftermarket price range: $150-$300
• Transmission Filter Kit (Includes Pan Gasket) (OEM #FT-188 (Motorcraft)) — The transmission pan must be removed to access the lead frame, so the filter and gasket must be replaced during the service.
  Trusted brands: Motorcraft, Wix, ATP
  OEM price range: $40-$70
  Aftermarket price range: $25-$50
• Transmission Bulkhead Connector Sleeve (OEM #BL3Z-7G276-A (Motorcraft)) — This seal is disturbed during the lead frame replacement and is a common leak point if not replaced. It is a critical and inexpensive part of a proper repair.
  Trusted brands: Motorcraft
  OEM price range: $15-$30
  Aftermarket price range: $10-$20
• Motorcraft MERCON LV Automatic Transmission Fluid (OEM #XT-10-QLVC) — The correct type of transmission fluid is required to refill the transmission after dropping the pan. The 6R80 transmission requires MERCON LV. A full pan drop and fill requires approximately 10-11 quarts.
  Trusted brands: Motorcraft
  OEM price range: $8-$12 per quart

Related Codes That Often Appear With This One

• P0720 — P0720 indicates an Output Speed Sensor circuit malfunction. It often appears with P0722 as the circuit fault progresses to a complete loss of signal. Both are explicitly mentioned in Ford's service actions for this issue.
• P0731 — P0731 means 'Gear 1 Incorrect Ratio'. The PCM may set this code when it commands a shift but doesn't see the expected change in speed from the OSS, which can happen when the OSS signal is lost. This code is also listed in Ford's lead frame extended warranty program.
• P1500 — P1500 indicates a Vehicle Speed Sensor intermittent failure. It is another code listed by Ford in Customer Satisfaction Program 19N01 as a key indicator that the molded lead frame requires replacement.

Technical Service Bulletins (TSBs) & Recalls

• TSB 13-6-8: Addresses wrong gear starts and P0720/P0722 codes on 2011-2013 F-150s, calling for an updated molded lead frame.
• Customer Satisfaction Program 19N01: Extended warranty coverage for the transmission molded lead frame on certain 2011-2013 F-150s with the 6R80 transmission, specifically for DTCs P0720, P0722, P0731, and/or P1500.
• TSB 21-2315: Relevant for 2017-2020 F-150s with the 10R80 transmission, this TSB addresses harsh engagement, harsh shifts, or delayed shifts, which can sometimes be confused with sensor issues but are related to the main control valve body.

Platform-Specific Known Issues

• Ford previously issued Customer Satisfaction Program 19N01 and Safety Recall 19S07 for this issue on earlier model years (2011-2013) with the 6R80 transmission. This program extended the warranty on the molded lead frame to 10 years or 150,000 miles. While the 2015-2020 models are not explicitly covered by these specific programs, the failure of the molded lead frame is the same well-documented problem, indicating a persistent design flaw in the 6R80 transmission used in these trucks.

Documented NHTSA Reports

• An owner reported a sudden limp mode where the vehicle became stuck in 1st, 3rd, or 5th gear at highway speeds, which a dealer confirmed was related to codes P0720 and P0722 (NHTSA ODI #11696479).
• NHTSA ODI #11475327 describes a situation where a dealer pulled codes P0706, P0707, P0720, P0722, P1921, P1702, and P0722, confirming a faulty molded lead frame as the cause.
• In NHTSA ODI #11578725, an owner noted that a wrench light and illuminated MIL were followed by a solid check engine light with DTCs P0720 and P0722; the dealership technician initially attempted to reprogram the PCM and output shaft speed sensor.
• A report in NHTSA ODI #11675766 mentions that DTC codes P061A and P0722 were logged in the PCM after an incident where an amber wrench icon was displayed.

Mechanic-Grade Diagnostic Values

• OSS Signal Circuit Resistance to Ground — expected: Greater than 10,000 ohms. Failure: Resistance less than 10,000 ohms indicates a short to ground in the harness or PCM.
• OSS Signal Circuit Continuity (Harness) — expected: Less than 5 ohms. Failure: Resistance greater than 5 ohms indicates an open circuit in the wiring between the transmission connector and the PCM.
• OSS Signal Circuit Voltage (Key On, Connector Disconnected) — expected: Less than 4.8 volts. Failure: Voltage greater than 4.8 volts could indicate a short to power in the harness.
• Valve Body Bolt Torque — expected: 71 in-lbs (8 Nm). Failure: Incorrect torque can lead to valve body distortion, leaks, or poor electrical connections for the new lead frame.

Scan Tool Commands That Help

• Ford IDS (Integrated Diagnostic System): Solenoid Body Strategy Data Download — This procedure is required after replacing the molded lead frame or the entire valve body. The PCM must be programmed with the 12-digit solenoid body identification and 13-digit strategy number from the new part to ensure correct shift pressures and timing.
• Ford IDS (Integrated Diagnostic System): Module Programming > Programmable Parameters > Transmission — This is the menu path within the Ford IDS software used to access the Solenoid Body Strategy Data Download function after installing a new lead frame.

Wiring & Ground Locations

• C1575 — The main 16-pin round external electrical connector on the passenger side of the 6R80 transmission case.. This is the primary connection point for the entire transmission harness, including the OSS sensor circuit. Checking for corrosion, pushed-out pins, or fluid intrusion here is a critical first step in external diagnostics.
• C1575, Pin 15 — Pin 15 of the main transmission vehicle harness connector (C1575).. This is the specific pin for the Output Shaft Speed (OSS) sensor signal wire. All voltage and resistance tests of the external circuit are performed at this pin.
• PCM Connector (e.g., C175T, C1381T, C1551E) — Located on the passenger-side firewall in the engine bay. The specific connector and pin number vary by engine.. This is the termination point of the OSS circuit at the Powertrain Control Module. Continuity is checked between Pin 15 at the transmission and the corresponding pin at the PCM (e.g., Pin 25 on C175T for 3.7L, Pin 14 on C1381T for 5.0L).
• Body-to-Frame Ground — Under the vehicle, typically below the driver or passenger door area, connecting the truck's body to the main frame.. This ground is notorious for corrosion on F-150s. A poor connection here can cause a host of intermittent and difficult-to-diagnose electrical issues, including communication codes and erratic module behavior that could potentially mimic sensor failures.

Real Owner Repair Stories

• Reddit user in r/MechanicAdvice (2016 Ford F-150 5.0L V8, 108k miles) — Wrench light appeared, vehicle spontaneously downshifted from 65 mph to 5th, then 3rd, and got stuck in 3rd gear (limp mode). Restarting the truck temporarily fixed it.
  ❌ Tried (didn't work) A transmission fluid service had been performed 4,000 miles prior, which did not prevent the failure.
  ✅ What actually fixed it The transmission shop diagnosed code P0722. The fluid was found to be very dark. The shop quoted a replacement lead frame and valve body for $2,250 as the direct fix for the code, but also noted the dark fluid indicated a possible larger issue, recommending a remanufactured transmission for $5,800.
• NHTSA ODI #11716692 — An owner reported having no 1st or 2nd gear until the vehicle was shut off and restarted. A local Ford dealer diagnosed the issue as a "P0722, pinpoint OSS sensor failure" and repaired it with a new lead frame.

OEM Part Supersession History

• AL3Z-7G276-A, AL3Z-7G276-B → AL3Z-7G276-D — Revisions to improve reliability and address the known failure points of the internal circuitry.
  Heads up: The 'D' revision is the correct and most updated part to use for this repair. While older stock of 'A' or 'B' may be found, they are inferior and should be avoided.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Warping Dashboard 🟠 Medium — Common on XL and XLT trims, especially in hot climates. The plastic dash can lift and separate near the defrost vents. (Ref: TSB 20-2268 (supersedes 19-2041 and SSM 47270))
• Frozen Door Latches 🔴 High — Widespread issue in 2015-2017 models where doors may not open or may not latch closed in freezing temperatures. (Ref: Recall 17S33, Customer Satisfaction Program 18N03, TSB 16-0155)
• 3.5L EcoBoost V6 Cam Phaser Rattle on Cold Start 🔴 High — Common on 2017-2020 models with the 3.5L EcoBoost. A loud rattle for 2-5 seconds on a cold start indicates worn VCT units, a costly repair. (Ref: TSB 20-2315)
• 10R80 10-Speed Transmission Harsh/Erratic Shifting 🟠 Medium → Shop Transmission Assembly — Affects many 2017-2020 models with the 10-speed automatic. Can present as harsh engagements, delayed shifts, or clunky behavior. (Ref: TSB 21-2315)
• IWE (Integrated Wheel End) Actuator Failure 🟠 Medium — Common on 4x4 models. A faulty vacuum system causes the front hubs to partially engage, leading to a grinding or growling noise while driving in 2WD.
• 5.0L V8 Excessive Oil Consumption 🟠 Medium — Some 2018-2020 models with the 5.0L V8 can consume excessive amounts of oil between changes, requiring frequent top-offs to prevent engine damage. (Ref: TSB 19-2365)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: Never. The molded lead frame is a known high-failure-rate electronic part. A used part from a salvage yard has an unknown history and is highly likely to have the same internal cracks or will fail soon after installation. The labor cost to access this part is too high to risk using a salvaged component.

What to inspect on the donor part:

• Not applicable, as a used part is not recommended.

OEM-only on this vehicle (don't cheap out):

• Molded Lead Frame

Brands owners have reported issues with on this vehicle:

• Dorman: While Dorman (p/n 926-149) is often the only available alternative when the OEM part is on national backorder, forum discussions show mixed results. Some users report success, while others have experienced failures shortly after installation. It should be considered a last resort if a Motorcraft part cannot be sourced.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0720 — Output Speed Sensor Circuit error; frequently appears alongside P0722 when the molded lead frame circuitry develops internal cracks.
• P0731 — Gear 1 Incorrect Ratio; often triggered in conjunction with P0722 during the lead frame failure's signature 'harsh downshift' into 1st gear.
• P1500 — Vehicle Speed Sensor Intermittent; cited in Customer Satisfaction Program 19N01 as a companion code for lead frame failures in the 6R80 transmission.
• P0721 — Output Speed Sensor Range/Performance; related to the same OSS sensor signal loss described in TSB 13-6-8.

Frequently Asked Questions