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.
Self-Diagnostic System: Self-Diagnostics
Signals from various sensors are monitored continuously by TCM. If signals are lost or become faulty, TCM will adapt electrical signals to transaxle components to protect transaxle. TCM adopts fixed replacement values (limp-home mode) to enable vehicle to be driven when certain failures occur. CHECK GEARBOX light will illuminate. Transaxle will not shift gears due to lack of electrical signal. Transaxle will operate in 4th gear in "D", and 3rd gear position. Transaxle will operate in 3rd gear in 2nd and 1st position. Manual shifting is possible into all other shift lever positions.
Faults are recorded in TCM memory in the form of Diagnostic Trouble Codes (DTC's). Codes can only be retrieved using Saab's ISAT tester. Follow manufacturer's instructions.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.