2021 RAM 3500 electrical system problems

What owners report

• “The contact owns a 2021 Ram 3500. The contact stated that while driving at various speeds, occasionally while activating the left turn signal to make a turn, the rear driver’s side turn signal failed to operate as intended. The message related to the brake light and turn signal was displayed on the…”

  filed Jul 1, 2026

• “While driving my truck I noticed my mpg gauge was showing 0 mpg. Then I realized my "miles to go" gauge was reading "low" even though I had plenty of fuel in the tank and my fuel gauge was showing 3/4 full. Even though I use my truck as a commercial vehicle, and drive coast to coast, I was luckily…”

  filed Nov 19, 2025

Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.

Related recalls

• An electrical short may occur in the heater grid relay with the ignition on or off
  Campaign 23V060000 · Feb 9, 2023
• An electrical short in the relay may cause a vehicle fire with the ignition on or off
  Campaign 21V798000 · Oct 14, 2021
• An electrical short may occur in the Solid State Intake Heater Grid Relay, which could…
  Campaign 21V163000 · Mar 11, 2021

Related service bulletins

• Sensor - turbocharger speed

  113742 · Service Bulletin/Repair Instructions · issued Jul 29, 2026

• SWITCH – HEADLAMP

  113069 · Service Bulletin/Repair Instructions · issued Jun 29, 2026

Electrical System problems in other 3500 years

Other reported problem areas on the 2021 RAM 3500