P0306 on Ford vehicles Cylinder 6 is misfiring

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Ford filed with NHTSA whose summary names P0306. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• SSM 46363 Service bulletin
  2017-02-07 · Engine And Engine Cooling — Exhaust System — Emission Control
• SOME 2016 EDGE/MKX VEHICLES EQUIPPED WITH A 2.7L ENGINE AND BUILT ON 1-APR-2016 AND THROUGH 1-OCT-2016 MAY EXHIBIT A ROUGH IDLE IN NEUTRAL OR PARK AT NORMAL OPERATING TEMPERATURE OR AFTER A HOT RESTART, WHITE OR BLUE SMOKE FROM THE EXHAUST, EXCESSIVE OIL CONSUMPTION AND/OR AN ILLUMINATED MALFUNCTION INDICATOR LAMP (MIL) WITH DIAGNOSTIC TROUBLE CODES (DTCS) P0300, P0301, P0302, P0303, P0304, P0305,
• 17-2235 Service bulletin
  2017-11-21 · Engine
• Some 2016-2017 Edge/MKX, 2017 Continental, and 2017 Fusion/MKZ vehicles equipped with a 2.7L or 3.0L gasoline turbocharged direct injection (GTDI) engine and built on 1-Apr-2016 and through 1-Jan-2017 may exhibit white or blue smoke from the exhaust, rough idle in neutral or park at normal operating temperature or after a hot restart. The vehicle may also exhibit an illuminated malfunction indicat
• TSB 19-2243 Service bulletin
  2019-08-12 · Engine And Engine Cooling
• Some 2016-2017 Edge/MKX, 2017 Continental/Fusion/MKZ vehicles equipped with a 2.7L or 3.0L EcoBoost engine and built on 1-Apr-2016 and through 1-Jan-2017 may exhibit white or blue smoke from the exhaust, rough idle in neutral or park at normal operating temperature or after a hot restart. The vehicle may also exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DT
• TSB 17-0007 Service bulletin
  2017-01-18 · Engine And Engine Cooling — Engine — Other Fuel Types — Turbo/Supercharger
• SOME 2016 F-150 VEHICLES EQUIPPED WITH A 2.7L GASOLINE TURBOCHARGED DIRECT INJECTION (GTDI) ENGINE AND BUILT ON 1-APR-2016 AND THROUGH 1-OCT-2016 MAY EXHIBIT WHITE OR BLUE SMOKE FROM THE EXHAUST, ROUGH IDLE IN NEUTRAL OR PARK AT NORMAL OPERATING TEMPERATURE OR AFTER A HOT RESTART. THE VEHICLE MAY ALSO EXHIBIT DIAGNOSTIC TROUBLE CODE (DTC) P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0316, P05
• TSB 18-2237 Service bulletin
  2018-08-30 · Engine And Engine Cooling — Exhaust System
• Some 2016-2017 F-150 vehicles equipped with a 2.7L EcoBoost engine and built on 1-Apr-2016 and through 1-Jan-2017 may exhibit white or blue smoke from the exhaust, rough idle in neutral or park at normal operating temperature or after a hot restart. The vehicle may also exhibit an illuminated malfunction indicator lamp (MIL) and diagnostic trouble codes (DTCs) P0300, P0301, P0302, P0303, P0304, P0
• TSB 19-2384 Service bulletin
  2019-12-19 · Engine And Engine Cooling
• Some 2016-2017 F-150 vehicles equipped with a 2.7L EcoBoost engine and built on 1-Apr-2016 and through 1-Jan-2017 may exhibit a rough idle in neutral or park at normal operating temperature with oil consumption greater than 1 liter (1 quart) in less than 4,800 km (3,000 miles). This may be due to a concern with the cylinder head valve guides. Vehicles with this condition may also exhibit an illumi
• SSM 46364 Service bulletin
  2017-02-07 · Engine And Engine Cooling — Exhaust System
• SOME 2017 MKZ/CONTINENTAL/FUSION VEHICLES EQUIPPED WITH THE 2.7L/3.0L ENGINE AND BUILT ON OR BEFORE 6-OCT-2016 MAY EXHIBIT A ROUGH IDLE IN NEUTRAL OR PARK AT NORMAL OPERATING TEMPERATURE OR AFTER A HOT RESTART, WHITE OR BLUE SMOKE FROM THE EXHAUST, EXCESSIVE OIL CONSUMPTION AND/OR AN ILLUMINATED MALFUNCTION INDICATOR LAMP (MIL) WITH DIAGNOSTIC TROUBLE CODES (DTCS) P0300, P0301, P0302, P0303, P0304
• SSM 54504 Service bulletin
  2026-01-16 · Fuel/Propulsion System
• Some 2016-2017 Edge/MKX, 2017 Continental/Fusion/MKZ vehicles equipped with a 2.7L or 3.0L EcoBoost engine and built on 1-Apr-2016 and through 1-Jan-2017 may exhibit white or blue smoke from the exhaust, rough idle in neutral or park at normal operating temperature or after a hot restart. The vehicle may also exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DT
• SSM 49028 Service bulletin
  2020-07-28 · Equipment
• Some 2017-2020 Ford GT vehicles may exhibit a runs rough or hard start with or without an illuminated MIL with DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 and/or P0316. Prior to performing any diagnostics, determine if the vehicle operating conditions may have resulted in multiple cold engine start-ups without allowing the engine to reach normal operating temperature and being driven. If t
• SSM 49536 Service bulletin
  2021-02-02 · Engine And Engine Cooling
• Some 2017-2021 Ford GT vehicles may exhibit a runs rough or hard start with or without an illuminated MIL with DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 and/or P0316. Prior to performing any diagnostics, determine if the vehicle operating conditions may have resulted in multiple cold engine start-ups without allowing the engine to reach normal operating temperature and being driven. If t
• SSM 50616 Service bulletin
  2022-03-18 · Engine And Engine Cooling
• Some 2017-2022 Ford GT vehicles may exhibit a runs rough or hard start with or without an illuminated MIL with DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 and/or P0316. Prior to performing any diagnostics, determine if the vehicle operating conditions may have resulted in multiple cold engine start-ups without allowing the engine to reach normal operating temperature and being driven. If t
• SSM 54948 Service bulletin
  2026-06-18 · Unknown Or Other
• Some 2025-2026 Explorer/Aviator/Police Interceptor Utility non-hybrid vehicles built on 06-Feb-2025 and through 13-Dec-2025 may exhibit various drivability symptoms including a rough idle or hesitation shortly after refueling. These symptoms may also be accompanied by liquid fuel in the fuel vapor lines and fuel vapor canister as well as an illuminated malfunction indicator lamp (MIL) with diagnos

A stored code names the test that failed, never the part that caused it. The record above is what Ford and its owners have filed about it; the code’s page across every make has the whole file.