GMC Envoy - Popular Questions, Answers, Tips & Manuals
2005 GMC ENVOY 4.2L. I have a P0740 code on it?
DTC P0740 Torque Converter Clutch (TCC) Enable Solenoid Control Circuit
Circuit Description
The torque converter clutch (TCC) solenoid valve is an electrical device that is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve in order to control TCC apply and release. The TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. The TCC solenoid valve receives ignition voltage through the ignition 0 voltage circuit. The powertrain control module (PCM) controls the solenoid by providing the ground path on the TCC solenoid valve control circuit. The PCM monitors the throttle position sensor voltage, the vehicle speed, and other inputs in order to determine when to energize the TCC solenoid valve.
When the PCM detects a continuous open, short to ground or short to power in the TCC solenoid valve circuit, then DTC P0740 sets. DTC P0740 is a type B DTC.
Check it out on youtube.
2005 GMC Envoy. What sensor do I need to change for temperature gauge please?
scan the ECT if it reads wrong most time the 17 year old thermostat is bad. stuck open, missing or those crazy fail safe stat gone wild.
ect 180 to 200f is normal .
if not thermostat is first. I used and IR gun to measure the stat hosing to see if its bad, 1minutes work,
most times the gauge never fails so we do 1simple test to prove that.
scan the PCM is first.
never seen a STaT good 17 year old,
had one that told near all day to hit 180f>?
when old that do nasty things, even stick closed and warp HEADS
why risk that, attack the stat.
2003 GMC Envoy. How do I hotwire my car as my key ignition messed up.
You can't, that only happens in old movies.
Your immobilizer works with a chip in the key transmitting a code to the transponder in the ignition column which sends the code to the engine computer, the body control computer, the transmission computer and the ignition module. They all have a chat about it and then decide if they will let the car have power to the ignition and fuel pump. This all happens fast between the ignition lighting up and turning the starter motor.
There are always people with other ideas though and make money from YouTube videos.
https://www.google.com/search?q=2003+gmc+envoy+bypass+immobilizer+bypass
It is better to fix the problem, not find a way around it. The cheapest solution is a mobile auto locksmith.
Hotwiring and stealing cars has virtually stopped since the advent of immobilizers.
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