Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Mazda 6 s, AutomaticFACTORY OEM SERVICE PROCEDURE
Transaxle Control Module (TCM)
- Check display of DTC U0100, using scan tool. See Figure.
- Referring to TCM Malfunction Locator Table, determine malfunctioning part of CAN system. See Figure and Fig 1 .
NOTE:
TCM is not able to read DTCs nor PIDs for confirming normal communication between ABS/TCS HU/CM and instrument cluster. Therefore use WDS or equivalent scan tool to read PIDs from the ABS/TCS HU/CM and instrument cluster in order to confirm normal communication between the two modules.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.