2012 Ford F-150: misfire or rough idle

Filed Nov 19, 2025 · Driver assistance, Engine · WI

- what component or system failed or malfunctioned, and is it available for inspection upon request? Ignition switch, traction control, ABS, steering angle sensor, steering angle module, misfire cylinder 3, TPMS sensor light with no TPMS failures, shifter will not move without force or having to try and engauge that gear multiple times before going into gear and blinkers in-op. "service advance trac" warning on display. - how was your safety or the safety of others put at risk? Vehicle no start, loss of traction control, loss of ABS system, transmission will not go into gear on first try and intermittent directional function. - has the problem been reproduced or confirmed by a dealer or independent service center? Problems can be easliy reproduced - issues produce mil/ dtc even after codes have been cleared intermittently. Operation of directionals varies on each start up. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Yes, multiple ase certified technicians - were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? Yes. Mil's include but not limited to: b10f1:14-0a, p0303:00af, p0316:00-2f, c1963-20, u0428-f0, b1b48:01-8a, u0401:68-08, c1b00:62-0b, u0428:20, c1278:20 and b1596:20. Dash warnings displayed: "service advanced trac", "tire pressure low", "check 4x4", traction control dash light stays illuminated, TPMS light flashes and stays illuminated, truck must roll to engage parking gear, brake light will stay intermittently illuminated, rough idle, vehicle will no start intermittently, intermittent loss of traction control, intermittent loss of ABS, intermittent loss of directionals, key fob and door lock switch will intermittently not trigger or trigger locking mechanism. The doors will open but ecu/PCM thinks the vehicle is locked but doors open and triggers alarm. Lock button on fob and door lock switch will not operate.

Filed Sep 29, 2025 · Engine, Fuel system · NC

Transmission Repairs, Molded Lead Frame Components Due to sudden downshift symptoms from sixth speed, gear to fist speed gear while drive higher speeds and low speeds. $1,421.00 Repairs completed 9/10/2025, at [XXX] , [XXX] , [XXX] . [XXX] , [XXX] , [XXX] , knowingly sold this said vehicle as Certified Pre-OWNED 8/27/2025. Now additional concerns, issues have been discovered with said vehicle Monday, September 22, 2025, AM, 1. Oil burning odor inside the passenger compartment. Vacuum Pump Gasket Failure, allowing oil to drip onto the exhaust manifold hot engine parts, components. Valve Cover Gasket Leaks. Safety consideration, due to symptoms, this vehicle is UNSAFE to operate, drive. Technical bulletins TSB’s were stated as issued from Ford Motor Company Engineering Service Operations, Ford Customer Service Division, Mr. [XXX] , Director, Ford Motor Company, [XXX] , [XXX] . Symptoms include Fuel Dilution PCV System TSB 15-00003, addresses fuel odor inside the passenger cabin on EcoBoost engines, this 3.5 L V6 (DOHC) Turbocharged Twin, PCV Valve Calibrations to reduce the fuel dilution in the engine oil. Oil leaks from the valve cover gaskets and turbo seals especially when accelerating and stopping said vehicle. Creating the oil dripping onto hot engine parts, components, causing the strong burnt oil smell within inside the passenger compartment while driving said vehicle. Intercooler condensation, 2011-2012 EcoBoost 3.5L V6 engine experiences intercooler condensation leading to above symptoms and causing stumbling while driving, operating said vehicle and misfiring, which also creates is accompanied by odors within passenger compartment. Safe Concern, vehicle can cause, catch fire due to oil, fuel leak, seapage into related component areas, while driving, operating. Your serious attention please and the costs asso INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 16, 2023 · Engine, Transmission · OH

Cylinder 2 had a stored code for misfire and oil and coolant mixture leaking from block. With the F150 raised up on the lift I removed the lower splash shields and continued inspection. Oil was found predominantly on passenger side with a mixture of oil and coolant leaking out drivers side. Using my lab scope I was able to locate the damage in the block. A large crack split down in a Y pattern. This split is located on cylinder #2 location. I would say #2 connecting rod has impacted block due to internal failure.

Filed Mar 2, 2020 · Engine · 85,000 miles · TX

Timing chair rattle and engine misfires due to stretch in timing chain. Engine goes in lump mode and looses power.

Filed Jun 20, 2019 · Electrical, Engine · 87,000 miles · KY

On at least 6 occasions, truck misfires and shakes violently when under load or attempting to accelerate. Pull off road or let off of accelerator and engine resumes normal operation. Happened once pulling empty trailer, happened 4 times merging onto interstate. Happened multiple times passing / accelerating on interstate. Frightening and dangerous when truck shakes violently on interstate. Roads were wet or rainy conditions in last 5 incidents. 2012 f150 fx4 with only 87000 miles. No accidents. Truck maintained and in excellent condition.

Filed Apr 17, 2019 · Engine, Fuel system · 45,000 miles · NM

I bought it with @ 10,000 miles on the odometer. I have had nothing but [xxx] with it from day one. First off I put two new front rotors and brake pads all the way around and both idler pulleys were squealing so I replaced them . Then at @ 19,000 miles I had to replace both cvj half shafts . Now at 45,000 miles they are both shot again the cvj half shafts are . On the first of january this year I was driving down the road and the vehicle was running good suddenly it began to cut out and the power fell off on its face. I purchased an obd11 code reader to try and diagnose the problem. It tells me that random misfire detected and that cylinders 5 6 7 8 are misfiring . Let me just say that 4 months later after going thru everything from the plugs wires injectors and replacing the fuel pump module assembly it is still not running and I'm at my end of trying to get the peice of $*** running. There is no way in [xxx] at 45,000 miles on the vehicle that I should be having all the [xxx] with the vehicle. I live in new mexico and we do have a lemon law here. I am beyond the shadow of a doubt sure that this truck is a [xxx] lemon. Parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Jan 14, 2019 · Engine · 118,000 miles · TX

While driving at about 45 MPH heading to town on a main access road. I lost all power, accleration, but could still steer to a stop. Not the battery it reads 12.3 and have power to my main fuse boxes, dome lights, but nothing on the dash and will not start. I hooked up an obdm and it only shows cylinder 5 misfire which I have also changed the plugs coil packs and also still has not yet fixed the problem.

Filed Jan 3, 2019 · Electrical, Transmission · 107,000 miles · MS

Transmission shifts erratically, jumping from lower to higher gears. While up to speed, immediately shifts to 1st causing redlining of rpms. Speedometer jumps erratically. Happened initially while accelerating from a stop. Caused loss of power and feeling of misfiring, then sudden surge forward. After getting up to approx. 40 MPH, transmission shifts to 1st and stays there. Could have easily caused a crash if this happened while cruising at highway speeds.

Filed Oct 25, 2018 · Engine, Fuel system · 20,000 miles · MO

2012 f-150 has an eco boost 3.5 l motor that misfires in damp/wet/rainy/cool weather. Motor goes into a misfire mode with no power to drive or accelerate truck. Before the mileage warranty was up, truck was taken to ford for their "fix". However, the issue has remained from 2012 to current year, 2018, and without ford fixing this problem will continue for the indefinite future of these motors from ford. Cannot trust truck to perform when needed and a safety hazard when driving, towing or accelerating when this occurrs.

Filed Jul 3, 2018 · Engine · 154,000 miles · NE

Tl* the contact owns a 2012 ford f-150. While driving approximately 60 MPH, the vehicle misfired and stalled. There were no warning indicators illuminated. The vehicle was taken to an independent mechanic where the technician replaced the spark plugs and the coils. But the failure recurred. The vehicle was taken to another independent mechanic who was unable to diagnose the failure. The technician called woodhouse ford at 402‑574‑2759 (located at 3633 n 72nd st, omaha, ne 68134), but the dealer was unable to provide any assistance. The manufacturer was not made aware of the failure. The failure mileage was approximately 154,000.

Filed Jun 27, 2018 · Engine, Transmission · 5 miles · NJ

My 2012 ford f150 xlt supercrew ecoboost has about 85000 miles and abruptly went from about 30-40mph to about 0mph a few times now while driving. Once time was very scary on a congested road. After this happened, its like my transmission misfires and misses gears all of the time. There is now a vacuum noise also coming out if the engine and it doesn't run right. I brought it to ford and they told me that I probably wasn't changing the oil properly (I had changed my oil every 3000-5000 miles regularly.), but now they said I messed up the timing chain and phasers and they had to be changed for a price of about 4000 dollars. I have owned other fords not ecoboosts and they all ran fine. I started doing some research and I am sure this is an engineering flaw on the part of ford. I actually read that the federal safety agency did research on this topic. There are tons of forums that have the information on them and believe that ford should do the right thing and do a recall or fix the problem. I know its a big problem. I don't think it is fair to the american consumer to have to shell out that kind of money on a bad design flaw on apart of ford that almost got me into an accident bad one time and when my kids and I have to go to an erupt stop. I don't tow anything and drive the truck like a car. This shouldn't be happening.

Filed May 23, 2018 · Engine · 96,000 miles · IL

Exhaust manifold studs. Design flaw of the exhaust manifolds on the f-150 ecoboost causing manifold bolts to snap/sheer, which in turn causes the manifolds to warp. This is causing noise, and possibly exhaust gases to enter the passenger compartment. Ford is offering a fix under program code: 17m05 for the f450/f550, but is excluding the other "f series" trucks which suffer from the same/similar issue. The issue was noticed immediately after an engine misfire began occurring (which is also a known issue). The dealership has quoted $1,400 to replace the manifolds and studs.