What is the transmission problem on a 2017 Ford Expedition?
The most commonly reported issue for the 2017 Expedition is transmission shudder and slipping from the 6R140 automatic transmission, often tied to the torque converter, valve body, or related controls.
What powers the Expedition’s transmission
The 2017 Ford Expedition uses Ford’s 6R140 6-speed automatic transmission. It is paired with the 3.5-liter EcoBoost V6 in most trims and is designed for robust towing and highway driving, but it has a history of specific reliability concerns with wear on internal components and hydraulic control valves over time.
Common symptoms to watch
Owners report several recurring symptoms that point to trouble within the 6R140 transmission in this model year. If you notice any of these, have the transmission checked promptly to avoid further damage.
- Shuddering or vibration during acceleration, typically around 40–60 mph, which may feel like the drivetrain is shaking or surging
- Harsh or delayed shifts between gears, especially between 2nd and 3rd or 3rd and 4th
- Transmission slipping or sudden loss of power while driving
- Torque converter clutch engaging or disengaging with a noticeable clunk or shudder
- Transmission warning light, limp mode, or related DTCs stored in the transmission control module
- Fluid leaks, burning smell, or dark/burnt-smelling transmission fluid
Note that symptoms can mirror other drivetrain problems, so a proper diagnostic is essential to confirm a transmission issue.
Causes and contributing factors
Several factors can contribute to 6R140 transmission troubles in the 2017 Expedition. Diagnosis will determine whether the cause is fluid-related, mechanical, or software-based.
- Degraded or contaminated transmission fluid, or low fluid level, which can affect lubrication and hydraulic pressure
- Torque converter wear or failure, including clutch material degradation or lock‑up issues
- Valve-body or solenoid problems leading to improper hydraulic control and shifting behavior
- Electronic control software calibration or sensor faults in the Transmission Control Module (TCM)
- Internal wear of gear sets or clutch packs, potentially from long-term use or towing stress
- Excessive heat from heavy towing or aggressive driving, accelerating wear on components
These factors can occur individually or in combination. A professional diagnosis is needed to identify the primary cause and the appropriate repair plan.
Diagnosis and possible remedies
Once a technician scans for fault codes and tests live transmission data, they’ll generally follow a staged approach to determine the fix. Owners should be aware that repair options vary by severity and warranty coverage.
- Diagnostic scan to retrieve transmission-related codes and live data such as line pressure and converter status
- Check transmission fluid condition and level; address leaks if present and perform a fluid change with the correct spec (Mercon LV for most 6R140 applications)
- Software update or reflash of the Transmission Control Module (TCM) if Ford has released calibrations to address symptoms
- Valve-body service or replacement of faulty solenoids if hydraulic control is implicated
- Torque converter inspection or replacement if converter wear or clutch slip is diagnosed
- In cases of persistent failure or extensive wear, a full transmission rebuild or replacement may be necessary
Timely maintenance and adherence to Ford’s service recommendations can reduce the risk of progressive damage. If you’re advised of a repair under warranty, discuss coverage with the dealer or Ford customer service.
What to know if you’re shopping for a 2017 Expedition
Used-expedition buyers should be aware that 6R140 transmission issues have been reported in some 2015–2019 Expeditions and Navigator models. Key steps include reviewing service history for transmission work, requesting a pre-purchase inspection focused on the transmission, and testing for symptoms in a short road drive and in a loaded-tow scenario if applicable.
- Ask for documentation of any prior transmission service, torque converter replacement, or valve-body work
- Check for a manufacturer's service bulletin or extended warranty coverage related to the 6R140
- Have the vehicle inspected by a mechanic familiar with Ford transmissions and, if possible, test with a load or on highway acceleration
Understanding the model's transmission history helps buyers make an informed decision and plan maintenance costs in the event issues appear later.
Summary
The 2017 Ford Expedition uses Ford’s 6R140 automatic transmission, and the most commonly reported problems involve shuddering, slipping, or harsh shifting. Diagnosing these issues typically involves scanning for codes, assessing fluid condition, and verifying proper torque converter operation and valve-body performance. Remedies range from software updates and fluid changes to valve-body or torque-converter replacements, and in severe cases, a full transmission rebuild. Regular maintenance and prompt attention to symptoms can help preserve performance and reliability.
