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My 1996 Grand Am. sets code P1864. Car will not shift into overdrive. I was told that the TCC solenoid is at fault. Where is the TCC solenoid located.

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It is located in the transmission under the valve body cover on the drivers side of the transmission. It is the solenoid on the bottom left hand side of the valve body. I had to take the suspension and frame support off and lower the transmission before I could remove to valve body cover. A retainer clip holds the TCC solenoid in place.


Posted on Mar 15, 2011


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The code will set if the expected RPM drop is not achieved while attempting to engage TCC or O/D. This indicates a malfunctioning torque convertor or overdrive clutch.

- Camshaft DTC present
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Error codes

Her is the definition and a list of possiable causes.

Code P1740-Torque converter clutch did not lock up when the PCM sent the command. Enabling conditions: No engine or transmissions codes are present, vehicle speed was under 70 MPH, TPS was under 33% open. When the PCM commanded the torque converter to lock, no change was detected in engine speed. Blocking action: This code can block the following monitors: none.
Testing: Check torque converter solenoid for proper operation.
Theory of Operation
The Torque Converter Clutch (TCC) Solenoid is used to engage the TCC which improves fuel economy.
When Monitored
The Torque Convertor Clutch (TCC) and Overdrive Clutch (OD) will be tested each time the PCM requests TCC engagement in 3rd gear and OD.
Set Condition
The DTC will set if the expected RPM drop is not achieved while attempting to engage TCC or OD. This indicates a malfunctioning torque convertor or overdrive clutch.
Possible Causes

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