6R80 transmission problems: F-150, Expedition, Mustang

TSS parts for Ford's 6R80: shallow pan filter, Rojo overhaul kit and Dorado overhaul kit

In short

The 6R80 is the 6-speed automatic in most 2009 to 2017 F-150s, the Expedition, the Navigator and the 2011 to 2017 automatic Mustang; Ford builds it from the ZF 6HP26 design.
If it suddenly downshifts to 1st or 2nd, starts in 5th or the speedometer drops to 0, start with the lead frame, the plate that carries the transmission's sensors.
Harsh shifts or slipping usually come from the valve body and its solenoids; after a repair, the computer needs a scan tool to relearn.
If it's slow to engage Drive or Reverse only on the first start of the day, Ford's bulletin for 2011 to 2014 models replaces the pump.
It takes MERCON LV and has no dipstick: the level is checked at the fill plug, hot, with a scan tool.

If your F-150, Expedition or automatic Mustang suddenly downshifts to first on the highway, starts in fifth, is slow to engage Drive or Reverse, or leaks fluid, it most likely has a 6R80 transmission. This article covers what type of transmission it is, which Fords and Lincolns have it, how to tell if yours is a 6R80, its most documented problems according to Ford and rebuild specialists, its trouble codes, which fluid it takes and which parts get replaced.

What type of transmission is the 6R80?

It's a 6-speed automatic for rear-wheel-drive and 4x4 vehicles. Ford builds it at its Livonia, Michigan plant, and it comes from the ZF 6HP26 design; the R in its name stands for rear-wheel drive. The first of the family was the 6R60 in the 2006 Explorer V8, then came the 6R75 in the 2007 and 2008 Expedition, and from the 2009 F-150 on, Ford calls it the 6R80. It has no bands: every shift is clutch to clutch, with five clutch packs:

A (forward): applied in 1st through 4th.
B (direct): 3rd, 5th and Reverse.
C (intermediate): 2nd and 6th.
D (low/reverse): Reverse and 1st when pulling away; it's also applied in Park and Neutral.
E (overdrive): 4th, 5th and 6th.

From the 2011 model year, Ford added a one-way clutch for 1st and moved control to the engine computer (PCM). On 2006 to 2010 units, the transmission control module (TCM) is inside, with the valve body. On 2011 and later units, what's inside is the lead frame: a plastic plate bolted to the valve body that carries the turbine speed (TSS) and output speed (OSS) sensors, the fluid temperature sensor and the transmission range (TR) sensor.

Which vehicles have the 6R80 transmission?

These are the applications in Ford's owner guides and service documents:

Vehicle	Years	Notes
F-150	2009 to 2017	Every engine except the 2009 and 2010 4.6 2V work truck, which kept the 4R75E, and, in 2017, the 3.5 EcoBoost and the Raptor, which got the 10R80
F-150 with the 3.3 V6	2018 to 2020	The other 2018 and newer F-150s have the 10R80 10-speed
F-150 Raptor	2010 to 2014	5.4 and 6.2 V8
Expedition	2009 to 2017	5.4 V8, then the 3.5 EcoBoost from 2015; the 2007 and 2008 have the 6R75
Lincoln Navigator	2009 to 2017	5.4 V8, then the 3.5 EcoBoost from 2015
Mustang (automatic)	2011 to 2017	3.7 V6 and 5.0 V8, and from 2015 the 2.3 EcoBoost; the 2005 to 2010 automatic is the 5R55S
Explorer, Sport Trac and Mountaineer V8	2006 to 2010	4.6 V8: Ford calls it the 6R60 through 2008 and the 6R80 in 2009 and 2010
Transit	2015 to 2019	The 2020 and newer Transit has the 10R80

In Mexico, the F-150 is sold as the Lobo (upscale trims) and the F-150 (work trims). According to Ford Mexico's spec sheets and brochures, the 6-speed is in the 2009 to 2016 Lobo, the 2011 to 2016 work F-150 and the 2018 to 2020 work F-150 with the 3.3 V6; the 2010 work F-150 with the 4.6 2V V8 was a 4-speed. Mexico also had the Lincoln Mark LT through 2014, a Lobo-based truck with the 6R80 and the 5.0 V8 in 2013 and 2014, the 3.7 V6 gasoline Transit in 2015 and 2016, and the 2019 to 2022 Ranger XLT 3.2 diesel automatic, which uses the 6R80 of the global Ranger. More detail by model in What transmission does my Ford have?.

How to tell if your transmission is a 6R80

From the outside, the 6R60, 6R75 and 6R80 look the same. These clues help:

The certification label, on the driver's door pillar or door edge, has a transmission (TR) code. According to Ford's owner guides, the 6R80 is 6 on the F-150, Expedition and Navigator, but 3 on the Mustang; the 6R75 is C, the 6R60 X and the 4R75E Q. The same letter changes by model: G is the 10R80 on 2017 and newer F-150s. Check the table in your vehicle's owner guide.
The 6R80 has no dipstick. The 4R75E 4-speed in the 2009 and 2010 work truck does: it's the quickest way to tell them apart.
The case has an identification tag with the part number, build date (day, month and year) and serial number. From 2011, another tag on the left side has the solenoid strategy code, which is needed if the valve body is replaced.
Parts change by year: 2011 brought the one-way clutch and PCM control and, according to rebuild specialists, the pump changed in April 2014 and the second-generation valve body arrived for 2015. Order parts by year, engine and transmission build date.
It isn't GM's 6L80: both use the same type of planetary gearset, but they're different transmissions and their parts don't interchange. Nor is it the 10R80 10-speed that replaced it, or the Super Duty's 6R140.

Common 6R80 problems

These are the problems documented in Ford's bulletins and recalls and by specialists such as Sonnax, Transmission Digest and TransGo. A bulletin doesn't mean every unit fails that way, but it does show where to start.

Sudden downshift to first or starts in fifth: the lead frame

This is the 6R80's most documented problem. If the computer loses the signal from the output shaft speed (OSS) sensor, which sits on the lead frame, the transmission can suddenly downshift to 1st at any speed, and Ford warns that the rear wheels may slide or lock. Ford recalled the 2011 to 2014 F-150 and the 2012 Expedition, Navigator and Mustang in the US and Canada for this, with a PCM software update. Ford traced it to cracked solder joints on the sensor's circuit board in a 2011 batch and, more broadly, to contamination, shorts, corroded connectors and damaged terminals.

The same part causes another symptom: in a 2013 bulletin, Ford describes trucks that start in 5th, with the speedometer at 0, dashes on the odometer and the wrench light on, which sometimes clears after a key cycle. The fix is a new lead frame and, according to the bulletin, the solenoids don't need replacing. For the 2015 to 2017 F-150, Ford opened another recall in 2026 because the range sensor, also on the lead frame, can lose its signal and drop the transmission into 2nd; if codes P0705, P0706, P0707 or P1702 have set, the lead frame is replaced.

If electronic control is lost completely, the 6R80 goes into limp mode: according to Ford, it stays in 3rd or 5th with maximum line pressure, and Park, Reverse and Neutral still work. You can check your truck's VIN for open recalls at nhtsa.gov or with a Ford dealer.

Harsh shifts, clunks or slipping: the valve body and solenoids

The valve body carries the solenoids that control each clutch. According to Sonnax and TransGo, the pressure regulator, solenoid regulator and clutch A control valve bores wear, the accumulator dampers wear out and the solenoids drift out of calibration. The symptoms are harsh shifts, clunks on downshifts, flared shifts or slipping, sometimes with incorrect-ratio or clutch apply-time codes. Sun Transmissions explains how a valve body works and how it fails.

In a 2017 bulletin, Ford says not every valve body needs replacing and asks you to inspect the bores, springs and valves. If it's replaced, the computer needs the solenoid strategy code from its tag and then an adaptive relearn drive cycle: without them, shifts can be erratic. Ford's workshop manual says a new valve body without its tag must not be installed, and after the adaptive strategy is reset, shifts can feel firmer for several days. If you replace a solenoid, according to TransGo, 2011 and later solenoids carry a calibration number and are replaced with one of the same number.

Slow to engage Drive or Reverse in the morning: the pump

If the transmission is slow to engage Drive or Reverse only on the first start after sitting for hours, then works normally, Ford has a bulletin for the 2011 to 2014 F-150, Expedition, Navigator and Mustang. It calls for a scan-tool test after at least 6 hours parked: if the vehicle doesn't reach 3 mph within 5 seconds, the complete pump is replaced. For 2007 to 2010 5.4 trucks there's another bulletin for the same symptom in cold weather; according to published copies, it checks for a cracked pump adapter seal and a sticking main regulator valve.

No Reverse

If Reverse won't engage or is slow, Ford's manual starts with the fluid level and filter, the lead frame and harness, the B and D clutch regulator valves, the pump adapter seal and those clutches' plates. According to Ford, code P07A8 means the low/reverse (D) clutch failed. But it isn't always wear: in 2012, Ford recalled F-150, Expedition, Navigator and Mustang units with a range sensor calibrated out of spec for Reverse, and on the 2015 to 2017 F-150 it documented a software issue, with no codes, when shifting from Manual 1 or 2 to Reverse while still rolling. Sun Transmissions has a general guide to why a car won't go in reverse.

Shudder on the highway or P0741: the converter lockup

The 6R80's converter has a two-plate lockup clutch that applies in 2nd through 6th. If it shudders at steady speed, Ford's manual first checks the fluid level and condition, the lockup solenoid and the lead frame, and calls for cleaning metal off the solenoid terminals; Sonnax also points to wear in the valve body's lockup valves. Ford says to finish the diagnosis before replacing the converter. And rule out what isn't the transmission: Transmission Digest documented shudders caused by misfires, low engine oil or a failing turbo, and on the 4x4 Ranger, Ford traced take-off shudder to driveshaft angles. Sun Transmissions explains how to tell a transmission shudder from other vibrations.

Noises when shifting into gear or downshifting

Ford has bulletins for some 6R80 noises: a growl or buzz when shifting from Park to Drive or Reverse after parking, on 2013 and 2014 models, fixed with the separator plate or the valve body depending on the transmission's build date; a squawk on hard-acceleration downshifts to 3rd on 5.0 F-150s built from April to July 2015, fixed with revised overdrive clutch plates; and a converter whine until lockup on some 2012 F-150s and 2013 Mustangs with the 3.7 V6. On the other hand, the clunk shifting between Reverse and Drive on the 2015 to 2017 Mustang turned out to be the driveshaft. And when you lift off the throttle, the lockup cuts fuel and you feel slight braking: according to the F-150 owner guide, that's normal.

Fluid leaks: pan, pump and connector

According to Ford's diagnostic chart, leaks mostly come from the pan gasket, the pump seal, the case electrical connector, the fill plug and the cooler lines. For 2009 and 2010 units, Ford has a bulletin for leaks at the electrical connector sleeve: its O-rings are replaced, and they must be black, not red or orange. If it leaks at the front, replace the pump seal and, on bushing-type pumps, check the bushing too: a worn one lets the converter hub wobble and damages the seal. On 2012 and 2013 F-150 4x4s with the 3.5 EcoBoost, Ford documented bell housing leaks at the case ribs that require a new case. Sun Transmissions covers pan gasket leaks.

Common 6R80 trouble codes

These are the codes in Ford's diagnostic chart and bulletins for the 6R80:

Code	What it means	What to check
P0705, P0706, P0707, P1702	Range sensor (TR)	Lead frame, connector and harness; on 2015 to 2017 F-150s, Ford's recall
P0715, P0717	Turbine speed sensor (TSS)	Lead frame and connector
P0720, P0722	Output speed sensor (OSS)	Lead frame; if it starts in 5th with the speedometer at 0, the 2013 bulletin
P0729, P0731 to P0735	Incorrect gear ratio	Fluid level, pressure, valve body and clutches
P2700 to P2704	Clutch A to E apply time	That clutch, its valve and its solenoid
P07A8	D clutch failed	No or slow Reverse, and no engine braking in 1st
P0741	Lockup not applying	Lockup solenoid and valves before the converter
P1783	Overheating	Fluid level, lockup, cooler and thermal bypass valve

Sun Transmissions has articles on codes P0705, P0706, P0715, P0717, P0720, P0729 and P0741. What the TSS sensor does is in Transmission TSS sensor.

What fluid does the 6R80 take?

MERCON LV. According to Ford/Motorcraft's fluid chart, every 2009 to 2020 6R80 takes it; the 6R60 and 6R75 left the factory with MERCON SP, but Ford now approves MERCON LV for them. Don't use MERCON ULV, which is the 10R80's fluid, or MERCON V, and don't add additives: Ford's chart prohibits them. The 6R80 has no dipstick: the level is checked at the fill plug on the right side of the case, which has a level indicator, with the engine running, the vehicle level and the fluid at operating temperature (Ford specifies 175 to 185 °F), so you need a scan tool to read that temperature. Low fluid can cause slipping; overfilling makes it foam and pressure turns erratic. Ford's documents don't agree on the change interval: follow your vehicle's maintenance schedule for how it's used, and replace the filter too if the fluid shows metal or with any internal repair.

How it's diagnosed and repaired

Scan it with a tool that reads the transmission's codes; on 2009 and 2010 units, the TCM's too.
Check the level at the fill plug, hot and with a scan tool, and the fluid's condition: burnt fluid or metal means internal damage, and pink, foamy fluid means coolant got in. Check the pan magnet too.
Rule out what isn't the transmission: the battery and alternator (Ford links code P1636 to low voltage on 2011 to 2014 models), engine faults, the driveshaft and the axle.
If the lead frame, valve body or a solenoid is replaced, you need a scan tool to load the strategy code and run the adaptive relearn drive cycle.
Check the VIN for open recalls.

How much does the repair cost? It depends on what failed: a gasket, the lead frame or the valve body isn't the same as a full rebuild. Get a diagnosis before accepting a replacement transmission.

See TSS parts for the 6R80

TSS parts for the 6R80

The TSS catalog has parts for the 6R80 and for the 6R60 and 6R75. The most requested are:

6R80 shallow pan filter, one of TSS's best sellers, plus 1.5-inch pickup filters (6R60, 6R75 and 6R80) and one for the Transit. The filter depends on the pan depth and the pickup: confirm it by vehicle and year.
TSS Rojo 6R80 overhaul kit, the economy line, and the Dorado, the premium line, in two versions: 2008 to 2014 and 2014 and later (second generation). For the 6R60 and 6R75, the H-D kit. We explain the difference in TSS Rojo vs Dorado overhaul kits.
Bonded pan gasket for the metal pan (6R60, 6R75 and 6R80).
Pump seal and pump bushing: for front leaks.
Case connector (6R60 and 6R80): for leaks at the connector.
6R80 steel plate pack.

Before ordering, confirm your transmission by year, engine and build date, especially on 2014 and later units. To buy online in the US, Sun Transmissions has a 6R60, 6R75, 6R80 and ZF 6HP26 parts collection, and if you're rebuilding one, it publishes the 6R80's clutch pack clearances.

TSS is an aftermarket brand with OEM-comparable quality and quality control on every product. You can buy it from our authorized distributors: in the United States from Sun Transmissions, and in Mexico the full TSS catalog at Transmisiones Veinte 07.

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