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P0771 on 2013-2020 Ford Fusion: Shift Solenoid 'E' Causes and Fixes

P0771 on a Ford Fusion indicates a 'Shift Solenoid E Stuck Off' fault in the automatic transmission. The most common fix is replacing the transmission solenoid body inside the transmission, a job best left to a professional. Expect costs to range from $650 to $1250 depending on using OEM vs. aftermarket parts and shop labor rates.

20 minutes to read 2013-2020 Ford Fusion

Most Likely Cause

Low or Dirty Transmission Fluid

Difficulty

5/5

Est. Time

4 hrs

DIY Doable?

🔧 Shop

Shop Labor

$650 – $1250

Parts Price

$200 – $500

⚠️ Drivable, but... — You can drive, but it's not recommended for long distances. The transmission may be in a 'limp mode' with limited gears, shift harshly, or slip, which can cause further internal damage and leave you stranded. Continued driving can also lead to transmission overheating.

Key Takeaways

P0771 on a 2013-2020 Fusion points to a problem with an internal transmission shift solenoid ('E').
This is not a common, well-documented issue for the Fusion, so diagnosis should start with the basics: checking transmission fluid level and condition.
The most probable repair is replacing the entire solenoid body inside the transmission, which is a job for a professional mechanic.
Driving with this code can lead to severe transmission damage, so it should be addressed promptly.
Ensure your mechanic uses the correct fluid (Motorcraft MERCON LV) during the repair.

The trouble code P0771 means the Powertrain Control Module (PCM) has detected that Shift Solenoid 'E' inside the automatic transmission is not working correctly. Specifically, the solenoid is 'stuck off,' meaning it is failing to open when commanded by the computer to direct the flow of hydraulic fluid. These solenoids are small electronic valves that direct fluid to engage and disengage the clutch packs needed for gear changes. When solenoid 'E' fails to open, it can lead to problems with specific gear changes, often affecting higher gears like 4th or 5th.

What's Unique About the 2013-2020 Ford Fusion

The 2013-2020 Ford Fusion, primarily equipped with the 6F35 6-speed automatic transmission, does not have a widely documented, recurring pattern of failure that specifically triggers a P0771 code. Unlike some vehicles with known TSBs for this exact issue, the Fusion is not one of them. However, the 6F35 transmission is shared with other Ford models like the Escape and Edge, which do report this code, pointing to the solenoid body as a common failure point. Therefore, this code requires a traditional diagnostic approach starting with the basics, rather than jumping to a known 'common fix' for the platform. This guide applies to non-hybrid models, as the hybrid's eCVT operates differently.

Generation note: The 2013-2020 year range covers the entire second generation of the Ford Fusion. This generation received facelifts in 2017 and 2019 which updated styling and features, but the core powertrain, including the 6F35 automatic transmission in non-hybrid models, remained largely consistent. Therefore, the information in this guide is applicable to the whole 2013-2020 range.

Professional service recommended: The repair involves removing the transmission side cover and the valve body to access the solenoids, which is complex, requires specialized tools, and can lead to more significant damage if done incorrectly. The process is labor-intensive and requires careful handling of sensitive components inside the transmission.

Symptoms You May Notice

Harsh, jerky, or delayed shifts
Transmission failing to shift into certain gears, especially higher gears
Transmission slipping between gears
Vehicle enters 'limp mode,' often stuck in 2nd or 3rd gear
Illuminated Check Engine Light or Transmission Warning Light
Reduced fuel economy
Transmission overheating
Engine stalls when coming to a stop in gear

⚠️ Don't Waste Money on the Wrong Fix

Replacing an individual shift solenoid when the entire solenoid body is faulty or when the issue is simply low/dirty fluid.
Replacing the entire transmission when only the valve body or solenoid body needs service.
Assuming the problem is mechanical when it is a wiring issue. One owner documented a lengthy repair process that ended up being a damaged wire from a rodent.

Most Likely Causes

Low or Dirty Transmission Fluid 🔴 High Probability This is the most common cause for solenoid issues on any automatic transmission. Old, degraded fluid can cause solenoids to stick or clog hydraulic passages. On the 6F35, owners have reported very dark fluid even with regular changes, suggesting a tendency to run hot or break down fluid.
How to confirm: Check the transmission fluid level and condition via the service plug. The fluid should be at the correct level, red in color, and not smell burnt or contain debris. The 6F35 often lacks a dipstick, requiring a level-check plug on the side of the case to be checked when the fluid is at operating temperature (85-93° C).
Typical fix: Perform a transmission fluid drain-and-fill. A full flush is not recommended by some experts as it can dislodge debris and clog the non-serviceable internal filter. Use only the specified Motorcraft MERCON LV fluid. 🎬 Watch this full step-by-step guide on servicing 6F35 transmission fluid
Est. part cost: $50-$150
Faulty Transmission Solenoid Body 🟡 Medium Probability The solenoids in the 6F35 transmission are part of a single assembly. An electrical failure or mechanical seizure of an individual solenoid (Solenoid 'E') requires replacing the entire solenoid body. This is the most common hard-part failure for this code.
How to confirm: After confirming fluid is good, a technician will use a scan tool to command the solenoid on and off while monitoring voltage. If the solenoid doesn't respond, it's likely faulty. Resistance can also be checked with a multimeter and compared to specifications.
Typical fix: Remove the transmission side cover and valve body to replace the entire solenoid body assembly. This requires programming the new solenoid's strategy ID to the TCM using a tool like FORScan.
Est. part cost: $200-$450
Damaged Wiring or Connectors ⚪ Low Probability Wiring inside the transmission is bathed in hot fluid, which can make it brittle over time. External wiring is subject to road debris and corrosion. A common mistake is replacing the solenoid without first testing the circuit for opens or shorts.
How to confirm: Visually inspect the external transmission harness. A technician will need to drop the transmission pan/cover to inspect the internal wiring harness (lead frame) leading to the solenoid body for breaks, shorts, or corroded pins. The main external connector is often designated C175T.
Typical fix: Repair the damaged section of the wiring harness or replace the connector.
Est. part cost: $20-$100

Rare But Worth Checking

Faulty Valve Body: The valve body contains the hydraulic channels that the solenoids control. If a channel is blocked with debris or a valve is stuck, it can mimic a solenoid failure. Often, the valve body and solenoid body are replaced as a single assembly for a more robust repair.
Faulty Powertrain Control Module (PCM/TCM): In rare cases, the module that commands the solenoid can fail. This should only be considered after all other possibilities (fluid, solenoid, wiring) have been exhaustively ruled out.

Diagnosis Steps

Check the transmission fluid level and condition. If low, top it off. If dark, burnt, or full of debris, perform a fluid and filter change. Use only MERCON LV fluid.
Use a professional scan tool (like FORScan for Fords) to check for other transmission-related codes and to view live data for the commanded state of Shift Solenoid 'E' versus its actual state.
Perform a visual inspection of the external transmission wiring harness and connectors for any signs of damage or corrosion, paying attention to the C175T connector.
If fluid and external wiring are okay, the next step is to access the transmission's internals by removing the side cover.
Inspect the internal wiring (lead frame) to the solenoid body for damage.
Test the resistance of Shift Solenoid 'E' with a multimeter. At room temperature (68-86°F or 20-30°C), the expected resistance is between 19.05 and 27.95 ohms. An open (infinite resistance) or shorted (near zero resistance) solenoid requires replacement.
If the solenoid tests good electrically, the issue may be a mechanical blockage within the solenoid or the valve body itself.
If a new solenoid body is installed, the new solenoid characterization/strategy ID must be programmed into the TCM using a tool like FORScan.

🎬 Watch how to program a 6F35 transmission using FORScan

If all components test good, the final step would be to diagnose the PCM, but this is very rare.

Parts You'll Likely Need

Transmission Solenoid Body Assembly (OEM #AL8Z-7G391-A) — This is the most direct fix for a failed Shift Solenoid 'E' in the 6F35 transmission. It replaces all the shift solenoids as a single unit, preventing future failures of the other original solenoids. This part is also listed under the remanufactured number AL8Z-7G391-DRM.
Trusted brands: Motorcraft, Rostra Precision Controls
OEM price range: $350-$500
Aftermarket price range: $200-$350
Automatic Transmission Fluid (OEM #XT-10-QLVC) — Required for any service that involves opening the transmission. The Ford 6F35 transmission requires Motorcraft MERCON LV fluid. Using the incorrect fluid can cause shifting problems.
Trusted brands: Motorcraft, Valvoline MaxLife LV, Castrol Transmax LV
OEM price range: $8-$12 per quart
Aftermarket price range: $7-$10 per quart

Related Codes That Often Appear With This One

P2704 — This code relates to 'Transmission Friction Element E Apply Time Range/Performance'. It often appears with P0771 on Ford vehicles, including the Edge, indicating a problem in the same clutch circuit that Solenoid E controls. The provided NHTSA TSBs for other Ford models confirm this pairing.
P0985 / P0986 — These codes are more specific electrical fault codes for the Shift Solenoid E Control Circuit, indicating a low (short to ground) or high (open circuit) condition, respectively. Seeing one of these alongside P0771 strongly points to an electrical problem in the wiring or the solenoid coil itself, rather than a mechanical blockage.
P0751-P076F — Any code in this range relates to other shift solenoids (A, B, C, D, F). If multiple solenoid codes are present, it points more strongly toward an electrical issue, a fluid problem, or a failing TCM rather than a single faulty solenoid.

Platform-Specific Known Issues

While not directly linked to P0771, a Customer Satisfaction Program (21N12) was issued for some 2017-2019 Fusions with the 1.5L engine for coolant intrusion into the cylinders, which can cause major engine problems.
A widespread recall (NHTSA 22S43) was issued for the shifter cable bushing on 2013-2016 Fusions. A failed bushing can prevent the vehicle from being in the gear selected by the driver, potentially allowing it to roll away when in Park. This does not cause code P0771 but is a critical transmission-related safety issue for the platform.

Mechanic-Grade Diagnostic Values

Shift Solenoid 'E' (SSE) Coil Resistance — expected: 19.05 - 27.95 Ω (Ohms) at 68-86°F (20-30°C). Failure: A reading of near-zero ohms indicates a short circuit. A reading of infinite resistance (OL) indicates an open circuit. Any reading significantly outside the specified range for a given temperature suggests a faulty solenoid coil.

Hidden / Shadow Codes Worth Checking

P0985: Shift Solenoid 'E' Control Circuit Low. This indicates the circuit is shorted to ground. (see via Professional scan tools like Ford IDS or advanced tools like FORScan.)
P0986: Shift Solenoid 'E' Control Circuit High. This indicates an open in the circuit (broken wire or disconnected connector). (see via Professional scan tools like Ford IDS or advanced tools like FORScan.)

Scan Tool Commands That Help

FORScan: Clear Transmission Adaptive Tables — This service function should be run before programming a new solenoid body to reset the transmission's learned shift parameters.
FORScan: Transmission Characterization Update — This is a mandatory step after replacing the solenoid body assembly. It programs the unique 16-digit Solenoid Strategy ID from the sticker on the new part into the TCM. Failure to do this will result in poor shift quality and potential transmission damage.
FORScan: Halt/Disable Adaptive Learning — Some users report disabling the adaptive learning function after clearing the tables provides a more consistent shift feel, especially on higher-mileage vehicles. This freezes the shift strategy.

Wiring & Ground Locations

C175T — This is the 50-pin connector that links the main engine wiring harness to the transmission components, including the solenoids. It is a critical junction point for testing the solenoid circuit from outside the transmission.. A corroded pin or damaged wire at this connector can cause an open or short in the Shift Solenoid E circuit, triggering code P0771. Testing for continuity and voltage at the specific pins for Solenoid E in this connector is a key diagnostic step before opening the transmission.

Real Owner Repair Stories

YouTube video by a transmission specialist (Precision Transmission) (2016 Ford Escape with 6F35 transmission) — A Shift Solenoid E code was present, along with metal contamination in the transmission.
❌ Tried (didn't work) The initial diagnosis might point to replacing the solenoid body, but the actual cause was deeper.
✅ What actually fixed it Upon disassembly of the valve body, the technician found that a plastic piece from a broken internal transmission filter had traveled through a fluid passage and physically jammed one of the valves in the valve body, preventing it from moving. This mechanical blockage mimicked a solenoid failure. The fix required replacing the valve body and addressing the source of the broken filter.

OEM Part Supersession History

AL8Z-7G391-A → AL8Z-7G391-A (Reman: AL8Z-7G391-DRM) — This part number appears to be stable for the Gen 1 6F35 transmission used in this Fusion generation.
Heads up: Ensure the solenoid body purchased is for the correct generation of the 6F35. Also, the Solenoid Strategy ID sticker MUST be present and legible on the new part for programming.

Model Year Variations Within This Range

2013-2020: While the 6F35 was used throughout this period, there were minor running changes to valve body design and software calibrations. However, the fundamental causes and repair procedures for P0771 remain the same. All non-hybrid models use the 6F35; it was not replaced by the 8-speed 8F35 in the Fusion as it was in the 2020 Escape.

Diagnostic Flowchart

Start by confirming if P0771 (Shift Solenoid 'E' Performance/Stuck Off) is the only code present and checking the condition of the 6F35 transmission fluid, which is the primary failure point on this platform.

Is the fluid dark/burnt but the vehicle still drives?

→ Perform a drain-and-fill using Motorcraft MERCON LV. Do not perform a high-pressure flush as it may clog the non-serviceable internal filter common in the 6F35.

Inspect the external transmission harness and C175T connector. Any signs of corrosion or damage?

→ Repair the wiring harness or replace the C175T connector. These are prone to road debris and heat-related brittleness.

Remove the side cover to access the solenoid body. Test resistance of Shift Solenoid 'E'. Is it between 19.05 and 27.95 ohms?

The Solenoid Body assembly must be replaced. Do you have access to FORScan or a high-level scan tool?

→ Replace the solenoid body assembly. You MUST program the new Solenoid Strategy ID/Characterization into the TCM for the 6F35 to shift correctly.

→ Professional service required. Replacing the solenoid body without programming the Strategy ID will result in harsh shifting or immediate return of P0771.

Use FORScan to command Solenoid 'E'. Does it respond mechanically?

The Solenoid Body assembly must be replaced. Do you have access to FORScan or a high-level scan tool?

→ Replace the solenoid body assembly. You MUST program the new Solenoid Strategy ID/Characterization into the TCM for the 6F35 to shift correctly.

→ Professional service required. Replacing the solenoid body without programming the Strategy ID will result in harsh shifting or immediate return of P0771.

→ Inspect the valve body for mechanical blockages or debris. If the valve body is clear, the PCM may be faulty, though this is rare on the 2013-2020 Fusion.