GMC Sierra - Popular Questions, Answers, Tips & Manuals - Page 4

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run the fault codes could be a problem crank/cam position sensor or bag ground wire connections

There is a fusible link inline of the heavy gage wire to the back of the alternator. The heavy gage wire come's off the starter solenoid . Fusible link will be near the soleniod connection . The smaller gage wire's come from the PCM - engine computer . The alternator is computer controlled .

You should be able to access it though the wheel well. Splash guard removal and a couple of bolts is all it should take to get it loose and out.

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Front Flasher is separate from the rear at the firewall connector. Find out if you have good front flasher bulb and with a test light if there is a good + and - for the front flasher. Now, for the blown fuse. I suspect there is a bad ground and the dome light and the flasher lights share the same ground. Explaining: If it is when you turn on the right flasher(This is the bad ground circuit. The right flasher will take a shortcut to the dome light and probably the dome fuse is rated low. That will blow the dome fuse (Overcharge on the dome fuse). Could be why the front signals don't work at all. (Flasher ground problem). Hope it helps.

Has nothing to do with the ABS ,wheel speed sensor . You vehicle use's a VSS vehicle speed sensor on the transmission . This VSS is a input to the PCM- engine computer . The PCM sends this info. in a message over the class 2 serial data bus, a communication network for the control modules ,to the instrument cluster . The cluster has a microprocessor with logic programmed in . Having the instrument cluster ,BCM ,an PCM checked for DTC'S - diagnostic trouble code's would be a good step ,plus viewing data to the instrument cluster . Is the PCM sending speed data to the instrument cluster . Speedometer The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists. DTC B0540 The DIC receives the vehicle speed information from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The PCM also sends a class 2 message to the DIC indicating the vehicle speed. If the DIC determines there is a loss of the vehicle speed signal from the PCM due to a vehicle speed signal circuit malfunction, a DTC sets. DTC P0608 The PCM creates the vehicle speed output signal by pulsing the circuit to ground. The PCM pulses the circuit at the same rate as the vehicle speed signal input. The PCM monitors the voltage on the vehicle speed output circuit. If the PCM determines the voltage is out of the normal operating range, a DTC sets DTC P0654 The PCM creates the engine speed output signal by pulsing the circuit to ground at a predetermined hertz rate. The PCM pulses the circuit at the same rate as the engine speed signal input. The PCM monitors the voltage on the engine speed output circuit. If the PCM determines the voltage is out of the normal operating range, a DTC sets. Speedometer and/or Odometer Inaccurate or Inoperative (Gas) Install a scan tool. Raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle in General Information. Start the engine. Place the transmission into drive for an automatic transmission or third gear for a manual transmission. With the scan tool, observe the Vehicle Speed parameter in the PCM Engine Data 1 data list. Does the Vehicle Speed parameter match the speedometer display? Your best bet , take your vehicle to a qualified repair shop .

When the problem is ongoing, if it cranks good, have a helper crank it while you check for spark at the plugs, if everything is hot, wear gloves. Check proper fuel pressure and fuel injector pulse. I'm especially interested in the fuel injector pulse. If your losing rpm signal, there will be no fuel injector pulse. How long since overall tune-up? Any applicable trouble codes? Your obd1 so checking trouble codes should be easy, as long as your mil lamp works. There may not be any codes, I don't know? I can only help with testing, you have to do the testing.

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It sounds like it could be the o2 sensors, the mass air flow sensor, or the idle air control valve, take the vehicle to your local auto parts store and have them connect their scanner and pull the codes.

This can be caused by two things in car audio. The internal memory battery has failed. The 'stay alive' wire has become disconnected.

You should not see any voltage after the 2-second prime until you actually start cranking the engine. If you don't see power on the grey wire when cranking, try jumpering across the fuel pump relay terminals

The speed o meter not working correctly is probably the result of a bad stepper motor inside the instrument cluster . GM had bad step motors from 2003 to 2006 . How to repair GM Instrument Cluster Speedometer Gauge Stepper . The problem with the heated seat is more then likely bad heating elements . Testing the electrical circuit is the way to find the problem . CHEVY GMC SEAT HEATER TROUBLESHOOTING YouTube

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probably not the cluster but the spiral wiring in the steering wheel broken

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That should be bank 1, sensor 2, and if installed, that is usually the one just before the cat converter.

a/c is putting strain on the engine. could be a problem with the pump as only supposed to drop rpms by a 0.5%to 1% or you have a dirty idler and its not able to get enough air on idle, could even be a blocking air filter.