2002 GMC Envoy - Page 4 - Answered Questions & Fixed issues

Does it light up ? When you turn the key on do the warning lights come on ? Check engine , oil , abs , air bag etc... just gauges not working ? Does the vehicle start an run ? With vehicle running is check engine light on ? GM had a problem with the stepper motors that control the gauges . How to repair GM Instrument Cluster Speedometer Gauge Stepper

For the alternator to work B+ voltage must be applied to the heavier gage wire on the back of the alternator ,plus the alternator is computer controlled , by the PCM ! Charging System Indicators BATTERY The IPC illuminates the battery indicator when the following occurs: ?€¢ The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.

?€¢ The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.

?€¢ The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

?€¢ The ignition is on, with the engine off. BATTERY NOT CHARGING The IPC illuminates the battery not charging indicator in the driver information center when the following occurs: ?€¢ The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.

?€¢ The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.

Your best is to have a qualified repair shop check it out ! Could have DTC'S - diagnostic trouble codes stored ! DTC P0562 The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition may cause a stalling condition or other drive ability concerns. DTC P0621 The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM. Under certain operating conditions, the PCM can turn Off the generator by turning Off the 5 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC. DTC P0622 Checking for codes an voltage drop testing the connections an using a scan tool to check data parameters is the only way to solve your problem . Which means taking to a qualified repair shop !

The compressor is in front of the muffler under the car. The parts cost 600+ for the compressor alone. Getting at it is another thing. You have to raise the car pretty high to get to the mounting bolts.

The fan speed resistor is most likely open.

A bulb is out on the left side.

Should be in the windshield glass.

Water is getting in the wire connector of the engine control module.

Clutch pack is worn. Needs a transmission overhaul

look for a loose or cracked vacuum hose.

The automatic idle control module is bad.

The load leveler sensor operates the compressor. It most likely is malfunctioning. It is located on the rear drivers side lower control arm.

Horns are on the radiator support bracket just behind the grille on the lower end of the bracket. The horn button on the steering wheel operates the horn relay in the under hood fuse box. Test it to see if it works.

Depends on the noise. If there is a low hydraulic pressure in the transmission, it will not shift optimally. The reverse clutch pack may be worn. Sounds like time for an overhaul.

It means internal damage or excessive wear to the internal parts.

Look for the under hood light , trunk light and the glove box light to see if they go out when they're supposed to. Use an amp meter in series with a battery cable and the battery post to measure the current draw. Pull one fuse at a time and watch the meter. You will isolate the offending circuit that way.

The pressure regulator in the oil pump may not be working, the idle speed may be too low and there may be a lot of wear on internal engine parts lowering oil pressure

one

The auto idle control module isn't working.

It's on the passenger side suction hose where it connects to the receiver/dryer cannister.

If it's one you made on a computer, put it back in the CD burner and use your burning software to close the session. If is;t a store bought CD then there is an internal problem in the radio.