Ford Bronco Common Problems & Reliability Guide
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Overview
The sixth-generation Ford Bronco was reintroduced in 2021 after a 25-year hiatus, offering a body-on-frame off-road SUV available in 2-door and 4-door variants. While the Bronco has been praised for its capabilities, early models have experienced issues with the 10-speed automatic transmission, hardtop leaks, and various electrical gremlins. The 2.3L EcoBoost and 2.7L EcoBoost V6 engines have proven generally reliable, though some owners report turbocharger and fuel system concerns.
Quick Summary
By Generation
Available Engines
Common OBD2 Codes
| Code | Frequency | Notes |
|---|---|---|
| P0420 | Common | Catalyst system efficiency below threshold - often caused by failed catalytic converter or oxygen sensor issues on higher-mileage Broncos |
| P0300 | Common | Random/multiple cylinder misfire detected - frequently related to ignition coil failures or carbon buildup on EcoBoost engines |
| P0171 | Occasional | System too lean (Bank 1) - can indicate vacuum leaks, faulty mass airflow sensor, or fuel delivery issues on turbocharged models |
| P0700 | Very Common | Transmission control system malfunction - extremely common on 2021-2022 models with 10R60 transmission issues, often accompanied by hard shifts or limp mode |
| U0100 | Common | Lost communication with ECM/PCM - electrical issue that has plagued some Broncos, often related to wiring harness problems or module failures |
| P0455 | Occasional | Evaporative emission system leak detected (large leak) - frequently caused by loose or damaged fuel cap, EVAP canister issues, or purge valve failures |
Known Problems
The 10R60 automatic transmission in 2021-2022 Broncos has been plagued with hard shifts, harsh downshifts, shuddering, and hesitation. Ford issued multiple TSBs and software updates, but many owners report persistent problems. Some cases have required complete transmission replacements under warranty.
Typical mileage: 0-30,000 miles
Shop parts for this repairWidespread reports of water intrusion through the hardtop, soft top, and freedom panels. Water leaks around the rear window, A-pillar, and removable roof panels are common complaints. Ford has issued TSBs and revised seals, but the problem persists for many owners.
Typical mileage: Any mileage
Shop parts for this repairThe rear differential pinion seal is prone to leaking, causing gear oil to drip onto the driveway. This is particularly common on Sasquatch models with the upgraded Dana rear axle. Dealers replace the seal under warranty, but some owners experience repeat failures.
Typical mileage: 10,000-50,000 miles
Shop parts for this repairThe molded-in-color (MIC) plastic fender flares on base and Big Bend models are prone to fading and discoloration, turning grayish or chalky after extended sun exposure. Ford initially denied warranty coverage but later extended coverage for some affected vehicles.
Typical mileage: Any mileage
Shop parts for this repairThe SYNC 4 infotainment system experiences frequent freezes, black screens, unresponsive touchscreens, and Bluetooth connectivity issues. Software updates help but don't always resolve the problems. Some cases require module replacement.
Typical mileage: Any mileage
Broncos equipped with the Sasquatch package and manual transmission can develop driveline vibration due to the steep driveshaft angles created by the lift. Ford issued a TSB recommending a transfer case drop bracket kit installation.
Typical mileage: 5,000-20,000 miles
Shop parts for this repairThe 2.3L EcoBoost engine is prone to ignition coil failures, causing misfires, rough idle, and check engine lights. This is a common issue across Ford's EcoBoost lineup. Replacing all four coils preventatively is often recommended.
Typical mileage: 40,000-80,000 miles
Shop parts for this repairSome Broncos experience door latch failures causing 'door ajar' warnings when doors are fully closed, or doors that won't open from the inside or outside. This is a known issue across multiple Ford models and has resulted in recalls on related vehicles.
Typical mileage: 10,000-60,000 miles
Shop parts for this repairRecalls
Certain 2021 Broncos with the Sasquatch package may have front driveshafts that were not properly assembled, which could result in driveshaft separation and loss of motive power, increasing crash risk. Dealers inspect and replace the driveshaft if necessary.
Some 2021-2022 Broncos may have rearview camera wiring harnesses that were improperly routed, causing the camera to display a blank image or become inoperative. Dealers reroute the wiring harness and replace damaged components.
Certain 2021-2023 Broncos with the 2.7L EcoBoost engine may have intake valves that fracture, which could result in engine failure and loss of motive power. Dealers will inspect and replace the engine if necessary.