Obscene678

Hey guys, I picked up a stock 05 GTO a few months ago and recently put some headers on it and got a street tune. Everything was working fine until this morning when I stepped on the gas (50% throttle) to pass someone and then, all of sudden, the transmission went into 3rd gear and stayed there. I have been told that this is the limp mode the transmission enters to protect itself. I noticed a few moments later that the spedometer wasnt working, so I took it to my buddys shop and changed the VSS. No beans, the car is still stuck in 3rd. My friend hooked up a SnapOn Verus scanner to it, deleted all the transmission codes, and noticed the VSS was giving proper speed readings on the scanner and not the speedometer. We pulled the codes and got the following:

• p0218 - Transmission Over Temp Condition
• p0562 - System Voltage Low
• p0563 - System Voltage High
• p0703 - Brake Switch Circuit
• p0711 - Trans Temperature Sesnor Curcuit Out of Range
• p0713 - Trans Temperature Sensor Curcuit Signal High
• p0719 - TCC/Brake Switch 'B' Circuit Signal Low/Short
• p0722 - Output Speed Sensor Circuit No/Low Signal
• p0723 - Output Speed Sensor Circuit Intermittent

I really don't know were to go from here. Any and all help is appreciated.

Chaos07

I know when i had a 3rd gear limp mode i tried everything from changing the shift solenoids to getting a brand new tranny and it didnt fix it at all. The problem eneded up being a bad computer where it controlled the tranny. But it was only throwing one code and you have ALOT lol. hope you find the problem soon

usmcpi

iTrader: (2)

So it was your TCM or ECU?

Chaos07

mine was the main computer for the car the PCM ECU lol whatever still learning all the abbrevations lol

brian 05 gto

its the tcm mine did the same thing dealer item and it has to be programed to the car to