Mechanical Fault.

Fault symptoms
CHECK GEARBOX warning lamp on.
TCM in Limp-Home mode.

Conditions
Selector lever position L, 3, 4 or D
Fluid temperature over 20C
Engine speed over 400 rpm

Fault criteria
When driving in fourth or fifth gear:
Calculated gear ratio is equivalent to third gear *4 %

Diagnostic help
The control module calculates the ratio between input and output speed. This ratio has a specific value in each gear and depends on the gear ratio. The diagnostic trouble code indicates that a fault has developed in solenoid S3.

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