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.
Shift Schedules
As mentioned earlier, the TCM has programming that allows it to select a variety of shift schedules. Shift schedule selection is dependent on the following:
- Shift lever position
- Throttle position
- Engine load
- Fluid temperature
- Software level
As driving conditions change, the TCM appropriately adjusts the shift schedule. Refer to the following table to determine the appropriate operation expected, depending on driving conditions.
| Schedule | Condition | Expected Operation |
|---|---|---|
| Extreme Cold | Oil temperature at start-up below -27° C (-16° F) | Park, Reverse, Neutral and 2nd gear only (prevents shifting which may fail a clutch with frequent shifts) |
| Cold | Oil temperature at start-up above -25° C (-12° F) and below 2° C (36° F) | - Delayed 2-3 upshift (approximately 22-31 mph) |
| - Delayed 3-4 upshift (45-53 mph) | ||
| - Early 4-3 costdown shift (approximately 30 mph) | ||
| - Early 3-2 coastdown shift (approximately 17 mph) | ||
| - High speed 4-2, 3-2, 2-1 kickdown shifts are prevented | ||
| - No EMCC | ||
| Warm | Oil temperature at start-up above 2° C (36° F) and below 27° C (80° F) | - Normal operation (upshift, kickdowns, and coastdowns) |
| - No EMCC | ||
| Hot | Oil temperature at start-up above 27° C (80° F) | - Normal operation (upshift, kickdowns, and coastdowns) |
| - Full EMCC, no PEMCC except to engage FEMCC (except at closed throttle at speeds above 70-83 mph) | ||
| Overheat | Oil temperature above 115° C (240° F) or engine coolant temperature above 118° C (244° F) | - Delayed 2-3 upshift (25-32 mph) |
| - Delayed 3-4 upshift (41-48 mph) | ||
| - 3rd gear FEMCC from 30-48 mph | ||
| - 3rd gear PEMCC from 27-31 mph | ||
| Super Overheat | Oil temperature above 127° C (260° F) | - All "Overheat" shift schedule features apply |
| - 2nd gear PEMCC above 22 mph | ||
| - Above 22 mph the torque converter will not unlock unless the throttle is closed or if a wide open throttle 2nd PEMCC to 1 kickdown is made |
NO RELATED
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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.