Transmission will not shift

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The first thing to check is the transmission fluid. Make sure it is clean and full.

Here are the directions for checking fluid. The attached picture correlates with the directions.

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FLUID LEVEL CHECK
MERCON(R) automatic Transmission Fluid is being replaced by MERCON(R) V as a service fluid, as per TSB 06-14-4.
Under normal circumstances, there is no need to check the fluid level of the transaxle, since the vehicle does not use up transmission fluid. However, if the transaxle is not working properly, for instance, the transaxle may slip or shift slowly, or there may be some sign of fluid leakage, the fluid level should be checked.

CAUTION: The vehicle should not be driven if the fluid level is below the bottom hole on the fluid level indicator and the outside temperature is above 10° C (50° F).

NOTE: If the vehicle has been operating for an extended period at high speeds or in city traffic during hot weather or pulling a trailer, the engine should be turned off for about 30 minutes to allow the fluid to cool before checking.

It is preferable to check the transmission fluid level at normal operating temperature after approximately 20 miles (32 km) of driving. However, if necessary, the fluid level can be checked without having to drive 20 miles (32 km) to obtain normal operating temperature if the outside temperature is above 10° C (50° F).

With the vehicle on a level surface, start the engine and move the transaxle range selector lever through all of the gear ranges, allowing sufficient time for each position to engage. Securely engage the transaxle range selector lever in the PARK position, fully set the parking brake, and leave the engine running.

Wipe off the fluid level indicator cap, pull the fluid level indicator out and wipe clean. Put the fluid level indicator back into the filler tube and make sure it is seated properly. Pull out the fluid level indicator and read the fluid level.

When checking fluid at normal operating temperature, the fluid level should be within the crosshatched area on the fluid level indicator. When the vehicle has not been driven, and the outside temperature is above 10° C (50° F), the fluid level should be between the hole and the lower edge of the crosshatched area on the fluid level indicator.

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HIGH OR LOW FLUID LEVEL
A fluid level that is too high may cause the fluid to become aerated due to the churning action of the rotating parts of the transaxle. Aerated fluid will cause erratic line pressure, which may result in harsh/soft shifts or engagements, damage to the clutch material, improper torque converter operation, and fluid coming out of the vent. If fluid level is too high, excess fluid must be removed.

A fluid level that is too low will affect transaxle operation, such as: slipping, slow engagements, and damage to internal hardware. Low levels may also indicate that a leak is present in the fluid system. If fluid level was low, add fluid.

ADDING FLUID

CAUTION: Use of any fluid other than specified could result in transaxle malfunction or failure. If you need to add fluid, first check for the correct fluid type (MERCON) V stamped on the fluid indicator. Before adding any fluid, be sure that the correct type will be used. Add fluid in 0.25L (1/2 pint) increments through the filler tube to bring the level to the correct area on the dipstick. If an overfill occurs, excess fluid must be removed. MERCON(R) automatic Transmission Fluid is being replaced by MERCON(R) V as a service fluid, as per TSB 06-14-4.

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Let me know what you find.

Joe