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.

P1740 Torque Converter Clutch or Overdrive Solenoid ...

https://www.engine-codes.com > p1740

Faulty Torque Converter Clutch (TCC) and Overdrive (OD) Solenoid. ... Torque Converter Clutch (TCC) and Overdrive (OD) clutch are tested when the Powertrain Control Module (PCM) requests TCC engagement in 3rd gear and Overdrive. The P1740 code will set if expected RPM drop is not

When the Torque Converter Clutch (TCC) isn't engaging or locks in engagement the light flashes a warning...The TCC solenoid may stick due to dirty transmission fluid...If the Check Engine Light
(CEL) is not lit have your transmission fluid changed...If it is lit the code is probably pointing at a defective TCC, Computer (PCM) or the clutch itself... you can take the vehicle to an auto parts store and have them read and define the trouble code for free...saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

I would suggest you go to a competent trans shop that is trustworthy .They should be able to diagnose the problem . If you keep driving it like that you blow it up for sure. Good luck Bill (also ask for your money back)

If by overdrive you mean torque converter lock up, check adjustment of brake TCC switch, and perhaps TCC solenoid inside transmission.

If the PCM detects high converter slip when the TCC is commanded on, then a DTC P0741 will set. The following conditions must exist for two times during the same ignition cycle. This code will set for all the same reasons that a P1870 will set: • The TCC duty cycle is greater than 50% • The TCC slip speed is greater than 180 RPM for 7 seconds • TCC slip in 3rd gear on 4L80-E transmissions Known causes for P0741: • Worn TCC valve bores in the valve body • Damaged or worn pump bearing seal • Defective TCC PWM or TCC apply solenoids • Restricted separator plate solenoid feed orifice • Defective converter • Computer reprogram • Channel plate sleeve & turbine shaft sealing ring damage

there is a total of 27 diagnostic steps to follow, but here is some info for you:
SYMPTOM
P1740-TCC O/D SOL PERFORMANCE

WHEN MONITORED
The Torque Convertor Clutch (TCC) and Overdrive Clutch (O/D) will be tested each time the PCM requests TCC engagement in 3rd gear and O/D.

SET CONDITION
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.

POSSIBLE CAUSES
- Camshaft DTC present
- Engine RPM DTC present
- Fuel level low
- Misfire DTC present
- Output speed DTC present
- P1765 DTC present
- Park/Neutral DTC present
- PTO engaged (if equipped)
- Torque converter clutch DTC present
- TPS DTC present
- Transfer case in low range (if equipped)
- Transmission Relay DTC present
- Transmission temperature too cold
- Intermittent
- Check transmission fluid-debris
- Check transmission fluid-stall
- 3-4 Shift Solenoid
- Oil Pan contains excessive debris
- Shaft or seal damage
- TCC solenoid
- Torque converter
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Is it not shifting into overdrive or is the (TCC) torque convertor clutch not coming on? If it is and O/D concern it could be a cracked shift solenoid, this will not set a code because the PCM only monitors electrical failures with solenoids. If it is a TCC concern the PCM should set a code related to a comparison between vehicle speed and engine RPM. Should. You need to have somebody access the on-board diagnostic program to diagnose the problem.

Check it out

any transmission fault codes? this trans is electronically shifted so there should be a fault code for the problem, have it tested. Any Kragen or Autozone can run the test for free

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.
P1740 TCC O/D SOL PERFORMANCE (GAS)
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
* ENGINE DTCS PRESENT
* TRANSMISSION DTCS PRESENT
* TRANSMISSION TEMPERATURE TOO COLD
* OIL PAN CONTAINS EXCESSIVE DEBRIS
* 3-4 SHIFT SOLENOID
* SHAFT OR SEAL DAMAGE
* TCC SOLENOID
* TORQUE CONVERTER