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P051B Powertrain · manufacturer code
P051B fault code: what 9 owners reported
P051B is a manufacturer-specific powertrain code (engine, transmission, fuel and emissions), so its exact definition belongs to the carmaker and is not in the generic OBD-II list. What it meant in practice is below, from 9 complaints owners filed with NHTSA. Updated November 3, 2026.
- 9owner reports
- 6car models
- 0mention a crash
- 0mention a fire
- 2016–2019model years
Which cars get code P051B?
Every model whose owners mentioned P051B in a complaint, most reports first. Each year opens that car's full problem report. Popular models collect more reports because more of them are on the road.
Where does P051B show up?
By brand
- Ford8
- Ram1
Component the owner filed it under
Is there a recall for P051B?
The others concern the component owners file this code under (Engine) on the same cars; they may or may not relate to the code. Recall repairs are free; check your VIN at nhtsa.gov/recalls.
Engine And Engine Cooling: Engine: Oil/Lubrication: Pump Ford Motor Company (Ford) is recalling certain 2016-2018 Ford Focus and 2018-2022 Ford EcoSport vehicles. The oil pump drive belt or drive belt tensioner may fail, resulting in a loss of engine oil pressure.
2018 Ford Ecosport, 2016 Ford Focus. Full risk and remedy on each car's report.
Engine And Engine Cooling Chrysler (FCA US, LLC) is recalling certain 2014-2019 Ram 1500 and 2014-2020 Jeep Grand Cherokee vehicles equipped with 3.0L Diesel engines. The crankshaft position sensor tone wheel may delaminate, causing the engine to lose its ability to synchronize the fuel injector pulses and cam shaft timing…
2019 Ram 1500. Full risk and remedy on each car's report.
Engine And Engine Cooling: Exhaust System: Emission Control: Gas Recirculation Valve (Egr Valve) Chrysler (FCA US LLC) is recalling certain 2014-2019 Ram 1500 and 1500 Classic Pickup trucks equipped with 3.0L Eco Diesel engines. The Exhaust Gas Recirculation (EGR) cooler may crack and allow pre-heated vaporized coolant to enter the EGR system. This mixture may combust inside the intake…
2019 Ram 1500. Full risk and remedy on each car's report.
Engine Ford Motor Company (Ford) is recalling certain 2015-2019 Ford F-150 and 2017-2019 Ford F-250 Super Duty, F-350 Super Duty, F-450 Super Duty, and F-550 Super Duty pick-up trucks equipped with an engine block heater and previously remedied under recall 18V894. During the previous repair, the block…
2017 Ford F-150. Full risk and remedy on each car's report.
Engine Ford Motor Company (Ford) is recalling certain 2015-2019 Ford F-150 and 2017-2019 Ford F-250 Super Duty, F-350 Super Duty, F-450 Super Duty, and F-550 Super Duty pick-up trucks equipped with an engine block heater. Water and contaminants may get into the block heater cable's splice connector causing…
2017 Ford F-150. Full risk and remedy on each car's report.
What happened when owners saw P051B?
9 of the 9 reports, spread across the models above, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
I believe I should not be charged for the needed repairs of my car. The dealership is charging me $7200 for repairs which I had nothing to do with. There are recalls pertaining to my vehicle. I posted the notes sent to me from the dealership. Note from tech: Verified the concern, engine has a misfire, CEL on some white smoke when started and also low on coolant. Hook up the IDS and found codes P0304, P0316 and P051B. Performed a cylinder balance test and found cylinder 4 misfiring. Performed a relative compression test and relative compression is ok. Reviewed mode 6 data and found cylinder 4 has been misfiring. During my visual inspection I found the coolant reservoir was empty/ low on…
VEHICLE EXPERIENCED A LOSS OF POWER GOING INTO SORT OF A LIMP MODE / LOW POWER MODE, INDICATED LOW ENGINE OIL PRESSURE ON THE DASH STATUS DISPLAY WITH A WRENCH LIGHT AND INCREASED ENGINE NOISE. DRIVER WAS ABLE TO GET THE VEHICLE OFF THE ROAD WITHOUT AN ACCIDENT OCCURING. THE ENGINE CODES SCANNED VIA THE OBDII PORT DIRECTLY AFTER ARE AS FOLLOWS: P051B, P0299, P0340, P0344, P0365 AND P0369. THE TAG/STICKER ON THE TOP OF THE MOTOR HAS THE FOLLOWING NUMBERS, DATE AND INFORMATION ON IT: H2BG 6L084 AA 1,01 427 CRAIOVA ENGINE PLANT 19JUL17 FWSTA19071410474H2BG 6L084 AA FE AFTER FINDING OUT ABOUT THE CURRENT RECALL CAMPAIGN 23S64 / 23V905 AND SPEAKING WITH A FORD REPRESENATIVE WHO RECOMENDED GETTING…
Camshaft phaser failure. We had code P051B which led to sensor replacement. Shortly after cold start engine rattle. Suspect was cam/phaser from web investigating. At 50k miles this should be covered. Ford wants $6,000 to change VCT, Timing belt & faulty cam phasers. Ford acknowledged in 2021 their fault, but this was never issued as recall. We never got ANY letter from Ford. For people like us that have low miles, ONLY get oil changes at Ford regularly, should not be punished for bad installed parts. Camshaft phasers need to be recalled.
JUST FILLED MY GAS TANK UP THEN AS I LEFT THE GAS STATION GOT ABOUT 1 MILE UP THE ROAD THEN WHILE SITTING AT A STOPLIGHT I TURNED THE AC ON AND IDLE DIPPED, CAR FELT LIKE IT WAS GOING TO DIE(WHICH IT DID) THEN AS I TRIED TO RE-START, CEL CAME ON AND CAR WOULD NOT START. ABOUT 2 MORE TIMES AND IT FIRED UP ALONG WITH A SERVICE ENGINE SOON MESSAGE ... LUCKILY FOR ME I WAS A BLOCK AWAY FROM FUTURE FORD LINCOLN WHERE I ORIGINALLY PURCHASED THE VEHICLE. 3 DAYS LATER I GOT A CALL SAYING MY VEHICLE WAS READY FOR PICK UP. I GET THERE AND THEY TELL ME THAT THE REASON WAS DUE TO I HAD A AFTERMARKET POWER WIRE ROUTED OVER ENGINE ASSEMBLY CAUSING ELECTRICAL INTERFERENCE. SO THEY DISCONNECTED WHAT I PAYED…
CHECK ENGINE LIGHT CAME ON WITH 3 CODES P051B PERTAINING TO THE CRANKCASE PRESSURE SENSOR, UPON FURTHER INVESTIGATION I'VE NOTICED THAT THE 1.5L ECOBOOST 2017 FORD ESCAPE HAS A RECALL BUT NOT THE 1.5L ECOBOOST 2017 FORD FUSION, THE SYSTEM FAILED TO NO FAULT OF MY OWN. RECALL NEEDED DUE TO FAULT OF FORD MANUFACTURING/EQUIPMENT. I NOTICED THE CHECK ENGINE LIGHT TURNED ON DURING ONE OF MY DAILY COMMUTES BACK HOME FROM UNIVERSITY.
On March, while I was leaving to take my children to school, I discovered a loud, heavy metallic knocking sound coming from the engine of my 2019 Ram 1500 Classic. As I depressed the gas pedal, the knocking frequency increased immediately with the engine RPMs. Prior to this total failure, I had noticed the truck feeling hesitant and "stuttering" when I was trying to accelerate from red lights in the days leading up to the incident. Because I was concerned the engine would stall or fail completely while my children were in the vehicle, I immediately stopped driving it. A subsequent inspection at Don White’s CDJR confirmed DTC P051B-00 (Crankcase Pressure Sensor Performance). This fault is a…
I went in for the recall notice I had received and wanted the dealership to check on a concern I had towards my Escape that came afloat the day prior. I had scheduled to bring my car in for the recall/car concerns, except, I ended up bringing it in early. Now, the car was shimmying and the ck engine light came on. After the inspection, I was read the tech's notes. I was then told the cost of its repairs was nearly $7200! My car is only 6/7yrs old with 56,000 miles. I have not had any engine issues. After seeing the NHTSA report concerning my vehicle, I feel the needed repair cost should not be from my wallet. Here is my Escape's VIN [XXX] as well as the notes from my dealer's tech. "Verified…
WHILE IN MOTION THE ENGINE WARNING LIGHT CAME ON. I TOOK IT TO THE DEALER AND THEY SAID IT WAS THE CRANK SHAFT SENSOR AND WAS SENDING CODE (DTC) P051B. THEY SAID THAT THE ENGINE WARRANTY WOULD NOT COVER IT.
ERRPR CODE P051B CRANKCASE PRESSURE SENSOR CIRCUIT RANGE/PREFORMANCE. AT ONLY 37000 MILES WARRANTY UP 36000
P051B: questions drivers ask
What does code P051B mean?
P051B is a manufacturer-specific powertrain code (engine, transmission, fuel and emissions), so its exact definition depends on the carmaker and is not in the generic OBD-II list. 9 owners reported it to NHTSA, most often for the Ford Escape (3), Ford Ecosport (2), Ford F-150 (1); their reports describe what happened.
Which cars get code P051B most often?
In NHTSA owner complaints, P051B is mentioned most for the Ford Escape (3), Ford Ecosport (2), Ford F-150 (1), across 6 models and model years 2016 to 2019. Popular models collect more reports because more of them are on the road.
Is there a recall for code P051B?
No NHTSA recall text names P051B directly. 5 recalls on the cars that report this code concern the same component owners name most (Engine); they may or may not relate to the code. Check your VIN at nhtsa.gov/recalls.
What should I do if my car shows P051B?
Write down when the code appeared and what the car did (warning lights, loss of power, noises, speed, weather). Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer or independent workshop to read the stored freeze-frame data before anyone clears the code, and keep the repair order. If the car loses power in traffic, stop driving it. CarHooq does not diagnose: these are owner reports and official recall notices, not repair advice.
How this page was made
CarHooq read the text of every owner complaint filed with NHTSA for 19 US and European brands (model years 2012 onwards) and picked out the diagnostic trouble codes owners wrote down. This page lists every mention of P051B. Manufacturer codes have no public standard definition, so CarHooq shows only what owners reported. Nothing here is a diagnosis. Data: NHTSA Office of Defects Investigation (public domain), retrieved November 3, 2026. How CarHooq reports are made.
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