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.
Emergency Program (Safety Mode)
If a malfunction causes the GS 20 to activate the emergency program, the transmission fault indicator and the Check Engine Light in the instrument cluster both illuminate (CAN signal activation) and electronic control terminates.
The transmission shifts manually in the following sequence:
- For range selector lever positions D, 4, 3 or 2, fifth gear is immediately activated (no electrical control). P, R and N positions operate normally.
- Torque converter lock up clutch is not functional.
- Reverse lock out is also not functional.
If the initial problem was a power down of the GS 20 control module, the transmission will shift manually in the following sequence:
- For range selector lever position D, 4, 3 or 2, fourth gear is immediately selected. P, R and N positions operate normally.
- Torque converter lock up clutch is not functional.
- Reverse lock out is also not functional.
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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.