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Chevy Silverado and GMC Sierra Electrical and Computer Issues

348 messages, Last post on Nov 06, 2009 at 10:33 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

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Messages Page 35 of 35: 1; ...; 29; 30; 31; 32; 33; 34; 35; Prev; Next; Last

#339 of 348 Re: 2500 HD misfiring [levin1] by greywrench Sep 22, 2009 (7:25 pm)
Replying to: levin1 (Sep 21, 2009 7:51 am) if the rattling cat is on the passenger side it may be your problem. if the cat is not burning off unburned fuel the post cat oxygen sensor will read a rich condition and the computer will deliver considerably less fuel to that bank of cylinders causing misfires. Replies to this message: levin1 (Sep 29, 2009 9:02 am)
#340 of 348 Re: 2500 HD misfiring [greywrench] by levin1 Sep 29, 2009 (9:02 am)
Replying to: greywrench (Sep 22, 2009 7:25 pm) Thanks for your response. I haven't had any trouble with the misfiring for a week. The rattling at the cat area has stopped, actually right before the misfiring started. I did get a diagnostic check run on the truck after the intake gasket was replaced and it misfired again and nothing came up, cats are good at the current 77,000 miles. I thot for sure the cats were bad, something was rattling under there and I never could find out what it was, everything was tight. Its purring like a kitten now, I'll keep on trucking. Thanks again.
#341 of 348 Re: 2007 Siverado 1500HD battery dies when truck is not used for more than 3-4 [carnut69] by kodak1 Oct 12, 2009 (5:30 pm)
Replying to: carnut69 (Sep 22, 2009 9:39 am) just joined this forum hope this helps you it was my problem my battery would always run down on my 06 4x4 it ended up being my windshield wiper motor shorting against the body try unplugging it for a few days. later
#342 of 348 01 CHEV.1500 SERVICE ENGINE LIGHT by denham Oct 16, 2009 (10:39 am)
Service Engine Light with Code 440 emission fault, can not seem to find the problem. Have checked the wires and plugs, gas cap,etc. The canister is ok, but not sure how to check the purge solenoid? Anyone who has had this problem or idea I can use! With the code cleared you can start and drive maybe three times before the service engine light comes back on. Replies to this message: shaneo (Oct 16, 2009 8:53 pm) denham (Oct 26, 2009 8:15 am) obyone (Oct 16, 2009 11:33 pm)
#343 of 348 Re: 01 CHEV.1500 SERVICE ENGINE LIGHT [denham] by shaneo Oct 16, 2009 (8:53 pm)
Replying to: denham (Oct 16, 2009 10:39 am) here is your solution unplug the battery for 3mins just enough to reset your truck and pllug back the battery and turn your ignition back on a wham bye bye service engine light.....keep me posted Replies to this message: denham (Oct 26, 2009 8:15 am)
#344 of 348 Re: 01 CHEV.1500 SERVICE ENGINE LIGHT [denham] by obyone Oct 16, 2009 (11:33 pm)
Replying to: denham (Oct 16, 2009 10:39 am) P0440 DESCRIPTION The EVAP LARGE LEAK TEST is based on applying vacuum to the EVAP system and monitoring the rate of vacuum decay. The Powertrain Control Module (PCM) uses the input from the Fuel Tank Pressure (FTP) sensor in order to determine the rate of vacuum decay. At an appropriate time, the PCM turns the EVAP canister purge valve ON (open) and the EVAP canister vent valve ON (closed). This allows the engine to draw a vacuum on the system. At a calibrated time or vacuum level, the PCM turns the purge valve OFF (closed), and tests the system vacuum. If the system is unable to achieve the calibrated vacuum level, the PCM will set DTC P0440. CONDITIONS FOR RUNNING THE DTC •DTCs P0107. P0108, P0110, P0112, P0113, P0115, P0117, P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121 or P1122 are not set. •The system voltage is between 10-18 volts . •The startup (ECT) engine coolant temperature is between than 4-30°C (39-86°F) , but the start up ECT is not more than 8°C (14°F) more than the startup IAT temperature. •The startup (IAT) intake air temperature is between than 4-30°C (39-86°F) , but the start up IAT is not more than 3°C (7°F) more than the startup ECT temperature. •The fuel tank level is between 15-85 percent . •The Barometric Pressure (BARO) is more than 75 kPa . •The Vehicle Speed Sensor (VSS) is less than 75 mph . CONDITIONS FOR SETTING THE DTC The EVAP system is not able to achieve or maintain vacuum during the diagnostic test. ACTION TAKEN WHEN THE DTC SETS •The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails. •The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. CONDITIONS FOR CLEARING THE MIL/DTC •The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. •A current DTC, Last Test Failed, clears when the diagnostic runs and passes. •A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. •Use a scan tool in order to clear the MIL and the DTC. DIAGNOSTIC AIDS •Use the EVAP pressure/purge diagnostic station in order to pressurize the EVAP system to aid in locating intermittent leaks. •Move all EVAP components while testing with the Ultrasonic Leak Detector. •A temporary blockage in the EVAP canister purge valve, purge pipe or EVAP canister could cause an intermittent condition. To repair a blockage in the EVAP system refer to Evaporative Emission (EVAP) System Cleaning. See: Emission Control Systems\Evaporative Emissions System\Service and Repair
#345 of 348 Re: 01 CHEV.1500 SERVICE ENGINE LIGHT [shaneo] by denham Oct 26, 2009 (8:15 am)
Replying to: shaneo (Oct 16, 2009 8:53 pm) Yes undo the battery will clear the code and the light will go out, but not fix the problem. The gas tank must build up pressure and most often it is the gas cap weak from use and you get the check engine light. This was my problem and I would say that anyone who has check engine light what any type auto they should first replace the gas cap as it could very well be the problem at little cost. Dennis
#346 of 348 turn signal issue by ahuff12 Oct 26, 2009 (2:27 pm)
03 1500 silverado..left turn signal will stop blinking when i put foot on brake pedal
#347 of 348 1999 gmc sierra by ray102 Nov 06, 2009 (9:00 pm)
my gadges go up and down and my batt. light comes on for a couple second and the gadges go crazy, rpm,speedomoder, oil,water temp, alt gadges go crazy and then quit working. does any body knows the problem please let me know. I change the alt. still not working. ray.
#348 of 348 Simple fix by azjas Nov 06, 2009 (10:33 pm)
It is the ignition harness causing you all the problems. Replace it -

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