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When the computer PCM detects a transmission issue. It will flash the OD light kind of like a check engine light for an engine concern. The computer thinks your traveling down the interstate miles from home. So it maxes out the line pressure inside the transmission to help prevent any slipping to keep it from failing (hard shifts), to allow you to get home or to a service facility. If you can get it scanned I can help you diagnose this.
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The code indicates the drivers side exterior mounted TR sensor is reading incorrect from an internal failure or external wire issue.
Use the diag steps in the link below.