Code P039, TCC Engagement Problem: Notes
WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
This code test monitors engine RPM and vehicle speed and compares them. PCM will set code when engine speed exceeds fault value for a particular vehicle speed. This code can set due to an electrical problem or slippage of TCC or transaxle clutches. If a TCC failure has occurred, failure is more likely to be observed under high road load (high MAP) conditions. Use code snapshot data to confirm failure.