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GM vehicles From 2003 to 2006 had insturment cluster problems , the motors that drive the gauges , (Stepper motors ) Plus you need to know the complexity of the electronic's on your vehicle . There is a serial data communication network that the module's share info.on . GM class 2 serial data buss . The temp. sensor is an input to the PCM - engine computer , the PCM sends this info to the insturment cluster over the data network ,the insturment cluster has a microprocessor with logic programmed inside . All it take's is for one module , in your case ,sounds like the insturment cluster having problems an bring down the data network . This can cause all kind of electrical problems . Even not starting . If you know nothing of automotive electronics your best bet , take it to a qualified repair shop. Without the proper diagnostic tools an service repair info. You probably won't be able to do anything to fix it. Need a professional type scan tool to view data .
What make , model and year vehicle ? depending on the vehicle and where that info is generated from could be a BCM - body control module , insturment cluster problem or PCM - engine computer. Taking the vehicle to a qualified repair shop that has a diagnostic scan tool that can check data from the point of origin to the insturment cluster is the proper way to diagnose this type problem . On most vehicle if a module or insturment cluster needs to be replaced programming will need to be done .
The gauge is bad . Replace insturment cluster maybe . Have it tested . Could be computer or data network problem . You need to know how it works . Depending on the make , model and year vehicle . Coolant temp. sensor is a input to the PCM - engine computer, the PCM sends this information to the insturment cluster over a serial data network . Having the vehicle hooked up to diagnostic equipment is the way to find the problem . GM vehicles years 2003 to 2006 had insturment cluster problems .
How do you know it's a passkey 3 anti-theft system problem ? Light lit on the insturment cluster ? Padlock car symbol . If the security light is lit ,do you have a scan tool that can read these codes
DTC B2960
DTC B3031
DTC B3055
DTC P1626
DTC P1629
DTC P1630
DTC P1631
NO , there is not a fuse just for those two thing's ! There are two power supply's for the whole insturment cluster . You could need a new cluster or the ECM isn't sending this info. to the cluster . Could have DTC'S - diagnostic trouble codes stored in the PCM or the insturment cluster . Without knowing how this works (insturment cluster gets it's info.) Your best bet , take it to a qualified repair shop that has the knowledge and test equipment to diagnose this problem.
Engine Oil Pressure Gage
The instrument panel cluster (IPC) displays the engine oil pressure as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 psi (0 kPa) or below if:
• The ECM detects a malfunction in the engine oil pressure sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
For the 4.2L LL8, the ECM uses an engine oil switch that is open when the oil pressure is normal and closed when the oil pressure is low. At normal pressure, the engine oil pressure gage will display 275 kPa (40 psi). At low pressure, the gage will go to 0 kPa and the low pressure warning will be displayed in the driver information center (DIC). At high pressure, the gage will display 551 kPa (80 psi). Any values between these three values are calculated values determined by the ECM.
Voltmeter
The instrument panel cluster (IPC) displays the vehicle voltage based on the information from the body control module (BCM). The IPC uses the serial data information from the BCM to provide a voltage level indication on the voltmeter.
DTC P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage
DTC P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage
Volt Gage Inaccurate or Inoperative
2
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the instrument panel cluster (IPC) gauges output control.
Does the volt gauge move up and down when commanded?
Doing electrical circuit testing of the thing's not working would be the way to find the problems . Not looking for magical fixes on here . Without testing anything said on here would be guesses . Are prepaired to replace a bunch of parts till it's fixed . Do you know how to do automotive electrical testing using a wiring diagram and a DVOM - digital volt ohm meter ?
the engine about 30 - 90 seconds and it will start and go another 3-15 miles and die again.
Do fuel pump electrical circuit testing an fuel pressure an flow testing . Electric Testing Techniques You Need to Know
This is why repair shops charge what they do . Takes years of learning (training ) to get good at testing electrical systems. Plus the amount of tool's required. $$$$$$$$
The fuel gauge or the sending unit could be the problem or the insturment cluster . Testing ,hooking up a scan tool that can read codes in the insturment cluster , that can read codes in all the modules on the vehicle.
Automatic or manual transmission ? tumbler sends voltage ??? What tumbler ? Ignition switch ,when it start position sends B+ voltage to the crank fuse in the insturment panel fuse box ,from there it goes transmission range switch,if in park or neutral it then goes through the relay pin 86 at the relay socket base . With the key in start you should see B+ voltage there . If not ,try moving the gear selector to neutral . if you still don't see B+ voltage , find the trans .range switch an check it.
Computer glitch , have it checked for DTC'S - diagnostic trouble codes . Not all codes turn on the check engine light . Plus DTC'S for the BCM - body control module won't turn the check engine light on at all , could turn on a yellow wrench symbol on the insturment cluster .
Stop putting head gasket sealer into the cooling system , could clog it up.
wiring from the sensor on the rear diff ? What sensor ?
The insturment cluster get's speed info over the PCI bus ( serial data network ) from the PCM - engine computer . The VSS - vehicle speed sensor is located on the transmission . The VSS is a input to the engine computer . Sorry , don't know who told you that . That is not correct . You should have it diagnosed at a qualified repair shop . Your insturment cluster or data network is probably at fault . Does the vehicle shift ok ?
The only sensor that mite be on the rear diff ,could be for the ABS ,an that has nothing to do with the speedometer .
Have the vehicle checked for DTC'S - diagnostic trouble codes .
best bet is to stop in at a Pep Boys, Autozone, or similar big autoparts seller, and ask for free trouble code scan, which should pinpoint area causing problem. If not obvious by codes, what is necessary to repair the problem code, get back to us with those codes and we will be glad to assist you further. Better this way, takes away the guess work, and saves you money, as well as getting it right the first time.
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