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Marcus Dwyer

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American vehicles and hybrids: diagnostics and battery health

22 years of experience
Email verified

Twenty-two years under the hood in Detroit. Twelve of them at a Ford dealership, where I made Senior Master technician, and the last ten on my own shop floor working almost entirely on hybrids and EVs. Most calls I take fall into three buckets. Manufacturer-specific trouble codes that generic scanners read wrong or not at all. The real state of health of a traction battery on a used car somebody is about to buy. And the electrical gremlins that show up after a US vehicle gets imported and put on 230-volt shore power. On a hybrid pack I will not quote you a replacement. I will tell you which cell-group voltages and internal-resistance readings to pull, how to read them, and whether a module-level repair gets you three more years for a fraction of the price. Bring the scan data if you have it, or we pull it together on the call.

Consultation languages

  • English
  • French

Skills

  • Hybrid and EV drivetrains
  • Traction battery diagnostics
  • Ford and GM factory scan tools
  • Imported vehicle compliance
  • High-voltage safety
  • CAN bus and module faults

What sets them apart

I will talk you out of a purchase. Roughly half the pre-purchase inspections I do on used American cars end with me saying walk away, and that is the call that saves the most money.

Education

  • · Associate of Applied Science in Automotive Technology, Wayne County Community College

Credentials

  • · Ford Senior Master Technician, 2003 to 2015.
  • · Independent hybrid and EV shop in Detroit since 2015.
  • · ASE Master Automobile Technician with L3 Light Duty Hybrid/Electric Vehicle Specialist certification, kept current.

Moderate cancellation

Fully refunded up to 24 hours before, half up to 2 hours before, nothing after that.