1999 PONTIAC MONTANA PO741

  • Tiny
  • GABE MARIN
  • 1999 Pontiac Montana

Transmission problem
1999 Pontiac Montana 6 cyl Front Wheel Drive Automatic 198000 miles

THIS CODE IS COMING OUT ON THE OBD, BUT THE TRANSMISSION ITS WORKING PERFECT WITH NO PROBLEMS AT ALL I TOOKED TO THE SHOP BUT THEY SAID THAT THE CODE THAT IS SHOWING MEAN THAT THE TRANY NEEDS 2BE REPAIR.

Wednesday, September 9th, 2009 AT 8:45 PM

1 Answer

  • Tiny
  • mhpautos
  • Expert
  • 30,495 posts

Hi there,

This is a code for the torque converter lock up clutch solinoid,

The TCC: The purpose of the Transmission Converter Clutch (TCC) feature is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise mode. The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter. Lockup reduces slippage in the converter increasing fuel economy. For the converter clutch to apply, two conditions must be met: " Internal transmission fluid pressure must be correct.
" The ECM must complete a ground circuit to energize the TCC solenoid that moves a check ball in the fluid line. This allows the converter clutch to apply, when hydraulic pressure is correct.
The TCC is very similar to the clutch in a manual transmission. When engaged, it makes a direct physical connection between the engine and transmission. Generally the TCC will engage at about 50 mph and disengage at about 45 mph.

It is worth having this seen to as it will be affecting fuel economy.

Mark (mhpautos)

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Wednesday, September 9th, 2009 AT 9:05 PM

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