NHTSA Complaint #11451132 — 2011 CHEVROLET MALIBU

MAP sensor was physically broken and replaced during a particularly cold snap (below -10 degrees F), but the check engine light and "Service ESC," "Service Traction," and "ESC off" messages continued to appear in the following weeks. Acceleration repeatedly dropped off for a split second, and would continue to dip and return until I let off the accelerator and tried again. This acceleration problem always coincided with the three ESC/Traction messages listed above, and happened multiple times every time I drove it. During a second trip to the mechanic, some "frayed wiring" was replaced and the throttle relearned, but the symptoms continued as before, prior to the MAP sensor replacement and the wiring repair. The symptoms progressed to delayed, pulsing acceleration, not just dropping out. The following week, the power steering went out while driving, preceded by a gentle automated jerking on the steering wheel upon startup. The mechanic confirmed that it was electrical, nothing wrong with the physical components.