Question about 2003 Chevrolet Malibu
I have a 2003 Malibu, 3.1 V6, 120K miles. Normally when I turn the ignition switch to on, all indicator warning lights and gas gauge work in the ip cluster. After a few seconds only the battery, check engine, theft system and gas are still operating. Also the heater fan and radio are operating since they were on previously. I can turn the switch to start and the car will start. Here's the intermittent problem: Sometimes only the theft light operates (along with fan and radio) when I turn the switch to on. The car won't start when I turn the switch to start. After 10 seconds or sometimes 60 seconds, all of the lights and gas gauge operate. I can then start the car. On two occasions, the lights and gauge operated only momentarily. I waited a little while and then everything operated and I was able to start the car. Do you have any suggestions on what is causing the problem and how to fix it? I don't think the battery and ignition switch are causing the problem.
Given the complexity of your vehicle , all the control modules , serial data communication network. Having the vehicle scanned for DTC'S - diagnostic trouble codes , not a code reader or at a auto parts store . A professional type tool is need to pull codes from BCM - body computer , Instrument cluster .
The IPC displays the fuel level as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the fuel level percent. The BCM converts the fuel level percent into a percent gage deflection. The IPC receives a message from the BCM via the serial peripheral interface (SPI) indicating the requested gage position. The fuel gage defaults to E (empty) if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The BCM detects a loss of class 2 communications with the PCM.
• The IPC detects a loss of SPI communications with the BCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.
Could have U- codes , communication network problems .
DTC U1000 and U1255
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the ID number of the module which sent the message for State of Health monitoring, Node Alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an ID number with at least one critical parameter within about 5.5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an ID number associated with it, the DTC will only be reported once.
The table below list the modules on the Class 2 Serial Data Circuit that will set a U1000 or U1255 and should be actively communicating the previously described messages on the Class 2 Serial Data Circuit.
Posted on Mar 09, 2017
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Posted on Jan 02, 2017
This happens on my '99 Malibu, too. No one I've talked to seems to know how to fix it, or they'll insist I take it to a Chevy stealership to get it fixed.
Posted on Sep 21, 2008
yr gonna have to get the passlock key and punch it into the radio so u can solve ur problem most chevy dealships can assist you with that.
Posted on Jun 18, 2009
Is the theftlock light lit up on the dash? It it is you may have a problem with the GM manufacturer theftlock device. The Theftlock system prevents the vehicle from being started without its own key and shuts of the fuel injectors which is typically why it turns over but won't start. It's quite problematic on mine and locks the car so you have to replace the cylinder.
If the "Theft System" light is flashing on in the dash sit in the car with the key in the "On" position. When the light stops flashing it will light solid for a second then go out. Open and close the driver side door, turn the car off, turn and start the car. This resets the theft lock and I kid you not it works.
Posted on Aug 31, 2009
no cutoff switch!! try this turn key to on, do not start car. let sit for about 30 minutes, after 30 minutes, turn key off. wait 15 seconds and try to start car. this should reset anti theft system.
Posted on Oct 22, 2009
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