Fault Code Lookup › Powertrain codes › P0777
P0777 Powertrain · generic OBD-II
Pressure Control Solenoid 'B' Stuck On
P0777 is a standard code covering engine, transmission, fuel and emissions. It names the system that logged the fault, not the part that failed. Below: which cars owners reported it on, what happened, and recalls on those cars, from 12 complaints filed with NHTSA. Updated November 9, 2026.
Owners also write it as P077700 (the last two characters are the sub-code).
- 12owner reports
- 10car models
- 0mention a crash
- 0mention a fire
- 2012–2024model years
Which cars get code P0777?
Every model whose owners mentioned P0777 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.
Audi A6
1 reportAudi Q5 e
1 reportChevrolet Silverado
1 reportChevrolet Silverado LD
1 reportChevrolet Tahoe
1 reportChevrolet Volt
1 reportGMC Sierra
1 reportGMC Yukon
1 reportGMC Yukon XL
1 reportWhere does P0777 show up?
By brand
- Jeep4
- Chevrolet3
- GMC3
- Audi2
Component the owner filed it under
Is there a recall for P0777?
The others concern the component owners file this code under (Power Train) on the same cars; they may or may not relate to the code. Recall repairs are free; check your VIN at nhtsa.gov/recalls.
Power Train: Automatic Transmission: Control Module: Software General Motors, LLC (GM) is recalling certain 2022 Chevrolet Tahoe, Chevrolet Suburban, GMC Yukon, GMC Yukon XL, Cadillac Escalade, and Cadillac Escalade ESV vehicles equipped with 10 Speed Transmission with ETRS (Electronic Transmission Range Select). The transmission control valve may fail and…
2022 Chevrolet Tahoe, 2022 GMC Yukon XL. Full risk and remedy on each car's report.
Power Train: Automatic Transmission: Control Module: Software General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Suburban, GMC Yukon, and Yukon XL vehicles equipped with diesel engines. The transmission control valve may fail and cause…
2021 GMC Yukon. Full risk and remedy on each car's report.
Power Train: Driveline: Driveshaft General Motors, LLC (GM) is recalling certain 2021 GMC Yukon, Yukon XL, Cadillac Escalade, Escalade ESV, Chevrolet Suburban, and Chevrolet Tahoe vehicles. The rear wheel driveshaft assemblies may have internal components that were not heat-treated properly, possibly resulting in driveshaft failure.
2021 GMC Yukon. Full risk and remedy on each car's report.
Power Train: Driveline: Driveshaft General Motors LLC (GM) is recalling certain 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500 and 2020 Chevrolet Silverado 2500 trucks. One of the driveshaft joints may not have been properly welded, causing the driveshaft to separate while the vehicle is moving.
2019 Chevrolet Silverado. Full risk and remedy on each car's report.
What happened when owners saw P0777?
10 of the 12 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.
VEHICLE STALLED WITH NO WARNING SIGNS WHILE I WAS DRIVING AND WENT INTO LIMP MODE, TOOK IT TO A JEEP DEALER TO CHECK IT OUT. THEY SAY THE JEEP NEEDS A WHOLE NEW TRANSMISSION. WILL NOT DRIVE AT ALL BUT HAS POWER. ONLY HAS 112,000. CODES: P0777 - PRESSURE CONTROL SOLENOID B - STUCK ON, P0741 - TORQUE CONVERTER CLUTCH SOLENOID - STUCK OFF, P0730 INCORRECT GREAT RATIO
Was driving on the highway, all of a sudden showed a sign of transmission malfunction and started decelerating which I could safely navigate the vehicle to the side of the road, got the vehicle towed to repair shop which they reported a transmission code P17F900- parking lock mechanical malfunction with codes P074700 and p077700 I am just out of warranty for this vehicle as I crossed 48000 miles. They have issued bulletins regarding this problem but no recall or extended warranty on that part this I deem as dangerous
Transmission malfunction while driving on a highway, car towed to dealer. They found codes P074700, P077700, P17F900 (TSB 2064312/6). Replaced mechatronic unit.
The contact owns a 2019 Chevrolet Silverado 1500. The contact stated while driving 40 MPH, the vehicle hesitated and jerked. The contact depressed the accelerator pedal, but the vehicle lost motive power. The transmission unexpectedly downshifted, and the power train and check engine warning lights illuminated. The contact pulled over to the side of the road and waited for a while. The contact was able to drive for a short distance before the failure recurred. The contact diagnosed the vehicle and retrieved DTC: P2820 (Pressure Control Solenoid "J" performance/Stuck Off); DTC: P0777 (Pressure Control Solenoid "B" Stuck On). The vehicle was taken to an independent mechanic who diagnosed and…
Car went to limp mode, hard shifting very suddenly. Transmission system failed. No reverse. Computer codes p0700 p0777 p18A1 inspected at Chevy service center and needs valve body replacement. No warnings, lights, alerts, hard shifts previously.
…P0777 POWER TRANS? SYSTEM DETECTED MALFUNCTION WITH TRANSMISSION CONTROL SYSTEM. MAY AFFECT VEHICLE PERFORMANCE INCLUDING SHIFTING BEHAVIOR. LUCKILY WE WERE ABLE DRIVE TO THE NEAREST DEALER AND HAVE A FAMILY MEMBER PICK US UP. THE DEALER VERIFIED THE CODES, CLEARED THEM, BUT WAS UNABLE TO "REPRODUCE" THE PROBLEM. THEREFORE THEY MADE NO CHANGE AND RETURNED THE CAR TO ME. MULTIPLE OTHER OWNERS HAVE ALSO HAD THIS PROBLEM AND HAS NOT BEEN SYSTEMICALLY TROUBLESHOOTED BY CHEVY AS THE LOCAL DEALER'S HAD NO IDEA HOW TO SERVICE.
Code P0777 – "Pressure Control Solenoid 'B' Stuck On" – Reduced Propulsion / Reduced Engine Power Initiated While merging onto the interstate, this code triggered a reduction in engine power, limiting my speed to 35 mph on a highway with a posted limit between 40-70 mph. Due to the limited power, I was forced to drive on the shoulder to reach the next exit and pull into a service station. I verified the code using an OBD-II reader at AutoZone. Subsequently, I had the truck towed approximately 1 hour and 30 minutes back home. The vehicle has been at a GM dealership since June 24th, where the faulty valve body has been confirmed. However, there is currently no estimated arrival date for the…
The contact owns a 2021 GMC Yukon. The contact stated that while driving at an undisclosed speed, the vehicle would independently activate Limp mode and would not accelerate past 30 MPH. In addition, the vehicle would not shift into the Reverse gear as intended. The vehicle was taken to a local dealer, where it was diagnosed with error codes: P0777 and P18A1. The vehicle was not repaired due to parts being on backorder. Upon further investigation, the contact related the failure to an Unknown NHTSA Campaign; however, the VIN was not included. The manufacturer was made aware of the failure. The failure mileage was approximately 90,000.
My car lost all power on a bridge and started jerking me forwards and backwards. High RPMS and eventually lost reverse. Code number p0777. Seems aligned with the newest transmission recall, but my vin is not listed.
TL* THE CONTACT OWNS A 2013 JEEP PATRIOT. THE CONTACT STATED THAT WHILE ATTEMPTING TO TRAVERSE A HILL, THE TRANSMISSION FAILED TO SHIFT AS INTENDED. THE CONTACT STATED THAT THE VEHICLE STARTED TO OVERHEAT AND THE SPEED WAS REDUCED INDEPENDENTLY. THE CONTACT ALSO STATED THAT THE VEHICLE FAILED TO EXCEED 40 MPH WITH THE ACCELERATOR PEDAL DEPRESSED. THE VEHICLE WAS TAKEN TO AN UNKNOWN MECHANIC THAT LOCATED FAILURES CODES P0777 AND P0741. THE CONTACT WAS INFORMED THAT THE TRANSMISSION NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE 107,000.
P0777: questions drivers ask
What does code P0777 mean?
P0777 is a generic OBD-II powertrain code. Its standard definition is "Pressure Control Solenoid 'B' Stuck On". The code tells you which system set the fault, not which part failed; the owner reports on this page show what it meant in practice for 10 car models.
Which cars get code P0777 most often?
In NHTSA owner complaints, P0777 is mentioned most for the Jeep Patriot (4), Audi A6 (1), Audi Q5 e (1), across 10 models and model years 2012 to 2024. Popular models collect more reports because more of them are on the road.
Is there a recall for code P0777?
No NHTSA recall text names P0777 directly. 4 recalls on the cars that report this code concern the same component owners name most (Power Train); they may or may not relate to the code. Check your VIN at nhtsa.gov/recalls.
What should I do if my car shows P0777?
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 P0777 (including sub-code forms such as P077700). The definition is the generic SAE J2012 wording; a carmaker may use the code slightly differently. Nothing here is a diagnosis. More answers: the fault code FAQ. Data: NHTSA Office of Defects Investigation (public domain), retrieved November 9, 2026. How CarHooq reports are made.
Is something missing or wrong on this page? Tell CarHooq. One line is enough; every message is read.
Look up another code
Or check a car: Problem Lookup · Used-car checker