Auto Trans Stuck in 3rd (Limp Mode) - Corroded Kick Panel Fuses

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Problem

Automatic transmission stuck in 3rd gear (limp/failsafe mode) and will not shift through gears on its own, only shifts when done manually. Common on cars that have sat for extended periods.

Transmission stuck in 3rd gearTransmission will not auto-shift through gearsCan only shift gears manuallyDefault fault condition in A340E automatic transmission

Root Cause

Corroded fuses in the kick panel fuse module causing electrical faults that triggered the transmission's limp mode (default to 3rd gear). The corrosion developed from the car sitting unused for an extended period.

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted March 2023 on SupraForums.com