Technician A says upshift and shift lamps are controlled by the PCM. Technician B says upshift and shift lamps help the driver maximize fuel economy. Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. The Powertrain Control Module (PCM) controls upshift and shift lamps based on various parameters to ensure optimal vehicle performance, and these lamps indeed help the driver maximize fuel economy by indicating the most efficient times to shift gears.

Technician a Says Upshift and Shift Lamps Are Controlled by the PCM