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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Starting Problems
193 messages, Last post on Nov 16, 2009 at 4:26 PM
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Replying to: Distilled (Dec 26, 2008 11:39 am)
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Replying to: Distilled (Dec 26, 2008 11:39 am) First of all, a little more information on what isn't working. In addition to my door locks the seat heaters, window controls, and the radio are not functioning. When the key is inserted and turned to ON the HUD lights up but says; UNKNOWN PASSENGER and when the shift lever is moved there is no indication as to what gear it is in. When the key is turned off a variety of jibberish type characters appear at random. That said, I couldn't get myself to believe that the fuel pump was my problem, so I went and purchased a fuel pressure tester and an OBD II engine scanner. Pressure indicated was 62# at the initial turn of the key and 55# while cranking which is within the specifications I have found. I plugged in the OBD scanner and it could not make a connection; key on or off it just kept saying; "Trying to establish a communications link" I tested the unit on another vehicle and all scans completed with no error. I've tested every fuse I could find for continuity and they all checked out. I tested every applicable relay skipping only those that referenced something like head lights or fog lights. I tested all fuses that I could find, that even seemed to relate to the ignition system, for voltage; I don't know the the exact voltages required, but all those tested had approximately 12V showing, +/- .2V or so. I'm stumped. The only thing I can believe is that one of the modules has gone haywire, it is my understanding that there are at least two; PCM (Powertrain Control Module) and the BCM (Body Control Module, which I believe to be a sub-system of the PCM) I guess I'm going to have to break down and take it in to the dealer for another $95 verification. It is my understanding that a PCM replacement with relearn is a spendy repair, so I'm hoping they find something that I've over looked....... a blown fuse would be nice...... an expensive oversight, but nice.
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I got a 2002 chevy silverado 2500 HD went to go to work this morning and nothing. Its got a brand new battery, brand new starter, its got voltage, i can hear the fuel pump turning on, but the starter makes no noise at all. I have checked all the ignition fuses i could see, dont know what to do next please help 
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Replying to: Distilled (Dec 26, 2008 4:06 pm) Short version: Connectors at the PCM were checked and corrosion and water was found, the connections were cleaned, greased, and reinstalled and she fired right up. I got the truck back last night, the only pending problem I've noticed is that the XM radio, which was factory installed, does not come up as an option on the radio. Other than that it's running like top. |
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Replying to: chevyhauler (Dec 28, 2008 1:29 am) If you don't have voltage at the starter motor or solenoid have you checked the obvious items such as fuses/circuit breakers? |
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Normally '95 truck starts and runs fine. Have had temps of minus 20 for 10 days and it is affecting everything, including my ability to remain outside working on the truck! Three batteries in 3 months. Charge battery, lights shine bright. Turn switch to ON and voltage only indicates 8. Turn switch to START and lights dim a little, solenoid clicks half-heartedly and starter will not turn. Put a jumper on and no change. Still will not start. When switch ON volts are only 8. Put an amp meter on the ground line with ignition switch off and there is a residual 0.8 amp drain on the battery. I usually disconnect the ground line from the battery overnight to protect the charge for the next morning. Have not been able to find the source of the ground leak (pulled all fuses, relays etc and still a constant drain). Sometimes if I leave the charger attached for 10 minutes, it starts up OK. While running the volts indicate 15-16 initially, then settle to 14 when battery is fully charged. If I start within an hour after shutting down it works, but if I leave it more than 2 hours it is dead. All indications of a good battery (lights bright) until I turn on the switch. Maybe the temperature stops the voltage from reading right? I suspect the starter is faulty, taking power but not turning over, but if the volts are reading right, why does the volts read only 8 when the ignition switch is on? If it was really 8, the lights would be dim? If it is the starter, would not the volts drop only when I turn the switch to START?
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Replying to: obyone (Oct 26, 2008 5:59 pm) Where is the fuel pressure regulator? Do you know where the crankshaft position sensor Is? My truck won't start until the second or third turn over..it used to start right away. It runs fine when it is started. Could those two things be my problem? Thank you |
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Replying to: chrisgh (Dec 26, 2008 3:16 pm) |
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Replying to: boofhead (Jan 08, 2009 9:26 am)
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Replying to: yank1 (Jan 19, 2009 2:34 pm) |
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