2020 Chevrolet Silverado fuel/propulsion system problems

“I received a notice via OnStar of a P129 code of a critical issue with engine or transmission system on my 2020 Silverado pickup after I pulled on to the highway. Vehicle reduced engine power warning and engine light came on. I was forced to put vehicle in neutral and restart vehicle several times. This code indicates fuel pump control module being defective. After researching, there seems to be issues with this on the the following; General Motors has issued voluntary emission recalls (such as bulletins N252516900 and N262558690) for the fuel pump power control module on select 2021–2023 Buick, Cadillac, Chevrolet, and GMC vehicles. The issue with my vehicle is the same.”

“have notice that the car jerks hard from time to time and when try to accelerate the car does a quick/short stop then accelerates hards very jerky. Also I smell coolant and my check engine light came on..”

“Vehicle sent alert on phone saying battery critically low, then the vehicle started having fuel gauge issue and started lurching. Shut the vehicle down saw a P129F in the alerts. Checked battery vehicle was a no start. Luckily near a shop so it wasn't catastrophic and was able to r eplace the fuel pump control module and it instantly started. This part NEEDS to be recalled it is a safety hazard that chevy does not aknowledge”

“While driving at highway speed, my vehicle developed a serious transmission problem. At approximately 75 mph, it suddenly lost the ability to maintain speed and dropped to about 55 mph despite throttle input. Engine RPM increased significantly and the vehicle had greatly reduced propulsion. Normal operation temporarily returned after the vehicle was shut off and restarted. The vehicle has also experienced harsh shifting, vibration, limp-mode behavior, a check-engine light, and I reported a momentary wheel-lock event. These symptoms create a safety concern because an unexpected loss of propulsion or abnormal transmission behavior at freeway speeds can increase the risk of a collision. The vehicle was inspected by an authorized Chevrolet dealer. The dealer documented transmission-related diagnostic codes including P0700, P0970, P0968, and P0711. The dealer's repair order specifically referenced GM program N242454441-03, described transmission control-valve wear and pressure loss, and recommended replacement of the valve body. A separate repair estimate included the valve-body assembly and related transmission service parts. Despite the dealer recommending…”

“Description of Problem: While driving, the engine intermittently revs on its own without any input from the accelerator pedal. During these episodes, the vehicle also shakes/vibrates noticeably. This has occurred [once / multiple times — specify frequency, e.g., “several times over the past X weeks”]. The engine revving is not consistent with normal acceleration and appears unrelated to throttle position. The shaking is felt throughout the cabin and is most noticeable [at idle / at speed / when the revving occurs — specify if known]. Safety Concern: This creates a risk of sudden, unintended changes in vehicle speed or loss of control, particularly if it occurs in traffic, while merging, or at highway speed.”

“The defective manufacturer lifters on my 2020 Chevrolet Silverado 1500 went on my truck damaging the lifters, camshaft, oil pump and I'm sure more than that. I know it's an ongoing investigation/lawsuit with General Motors, but they need to held accountable and should fix this issue free of charge. Not everyone has $5k-$10k+ to repair their engine due to their negligence. Thank you”