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.
Transmission Control Module (TCM) Comprehensive Component Monitor (CCM): Notes
The TCM CCM detects concerns in the TCM system. The TCM CCM oversees internal and external TCM components, as well as internal and external circuits which provide input or output signals to the TCM.
When a monitored component concern is detected, the TCM stores a DTC and illuminates the powertrain malfunction indicator (wrench) lamp.
The following components are monitored:
- motor electronics cooling system (MECS)
- auxiliary heater system (plug in vehicles only)
- transmission oil pump (plug in vehicles only)
- high voltage sensors
- clean tach out
- ECO mode
- electric motor position sensors
- electric motor current sensors
- electric drive temperature sensors
- electric vehicle mode
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.