2015–2021 Ford F-150 Common Problems: What Owners Report Most

The Ford F-150 has been America's best-selling vehicle for over 40 years — and for good reason. It's capable, comfortable, and has a massive ecosystem of support. But the 2015–2021 generation (13th gen) brought major changes including an all-aluminum body, new EcoBoost engines, and a 10-speed transmission that came with their own teething issues. If you're buying a used F-150 from this era, here's exactly what to watch for.

Quick Reliability Overview

Overall, the 2015–2021 F-150 scores above average for truck reliability — but it has several well-documented issues concentrated in specific model years and engine/transmission combinations. Understanding which configuration you're buying is more important than the year alone.

Problem #1: Timing Chain Issues (3.5L EcoBoost Gen 1, 2.7L)

The first-generation 3.5L EcoBoost (2015–2017) and early 2.7L EcoBoost (2015–2016) had issues with timing chain tensioners and timing chain stretch. On the 3.5L, worn phase actuators and a stretched chain can produce a rattling noise on cold startup — often called the "EcoBoost cold start rattle."

What to listen for: A metallic ticking or rattling sound in the first 10–20 seconds after cold start that disappears once the engine warms up. Ford issued TSBs and extended warranty coverage for many affected vehicles.

Repair cost if needed: $1,500–$3,000+ depending on extent of wear. Early 3.5L EcoBoost trucks should always be started cold during a test drive and listened to carefully.

Problem #2: 10-Speed Transmission Shudder / Harsh Shifts

The 10R80 10-speed automatic transmission was introduced on 2017 F-150s and became widespread across the lineup. Early examples (2017–2019) were plagued by complaints of harsh 1-2 shifts, low-speed shudder during light throttle, gear hunting at highway speeds, and delayed engagement.

Ford released multiple TSBs and software calibration updates for this transmission, and most issues on 2020–2021 trucks were resolved. However, many pre-update trucks are still on the road without the fix applied.

Problem #3: Carbon Buildup (Direct-Injection EcoBoost Engines)

Like all direct-injection engines, the EcoBoost family is susceptible to carbon buildup on intake valves because fuel (which normally cleans the valves in port-injection engines) never touches them. Over time, carbon deposits restrict airflow and cause rough idle, misfires, and reduced power.

The 2018+ 3.5L EcoBoost added port injection alongside direct injection, significantly reducing this issue. For 2015–2017 models with 60,000+ miles, a walnut blasting service ($400–$700) restores intake valve cleanliness.

Problem #4: SYNC Infotainment Freezing

SYNC 3 (2016+) was a major improvement over earlier Ford infotainment systems, but it still suffers from occasional freezes, slow startup, and Bluetooth pairing issues. Most problems can be resolved with a master reset (hold power + forward skip button) or an OTA software update. SYNC 4 on 2021+ models is more stable.

Problem #5: Brake Rotor Warping

A common complaint across F-150 model years is brake pedal pulsation — caused by warped rotors — particularly after heavy or repeated braking from highway speeds. The larger, heavier truck amplifies heat buildup in the rotors. Replacing with upgraded rotors and quality pads (and avoiding hard braking for the first 1,000 miles on new brakes) largely eliminates this.

What to Check Before Buying a Used F-150

• Cold start the engine. Listen for timing chain rattle on 2015–2017 3.5L or 2015–2016 2.7L EcoBoost models.
• Test the transmission thoroughly. Light throttle from a stop, highway cruising, and gentle deceleration — feel for any shudder, hunting, or harsh shifts.
• Check for TSBs applied. Ask the dealer or use NHTSA's database to see what technical service bulletins apply to the VIN — and whether they've been performed.
• Check frame and underbody for corrosion. Despite the aluminum body, the frame is still steel and can rust significantly in northern states.
• Scan for fault codes. An OBD2 scan may reveal transmission codes, misfire history, or injector faults not visible during a test drive.

Best Years to Buy