Question about 2003 Chevrolet Malibu

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Most of the warning lights and fuel gauge does not operate when the ignition switch is turned to on.

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.

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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 .

Fuel Gage
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


SOURCE: 2003 chervolet malibu - 60,000 miles

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

  • 81 Answers

SOURCE: theft system passlock on 2003 chevy malibu. theft

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

  • 353 Answers

SOURCE: Speedometer, RPM, Odomoter and Gearship indicator

check all grounds

Posted on Jun 20, 2009

  • 1 Answer

SOURCE: 2003 malibu will turn over but wont start.instrument cluster inop

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

  • 3640 Answers

SOURCE: anti theft light comes on when driving

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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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...

Well Gary , you should have it checked for DTC'S - diagnostic trouble codes . Not at a part's store , thier diagnostic tool only checks engine computer codes ! Your vehicle has a number of control modules , PCM/ECM - engine , BCM - body , ABS , Air bag , the instrument cluster has a microprocessor inside , an can set DTC'S as well. But the only way to read codes in most of these modules is with a professional type scan tool . The warning lights come on when you turn the key on as a bulb check an to let you know those systems are functioning . Could be your instrument cluster is defective or a communication network problem , do you know what a serial data bus or communication network is ? This is what the control modules share information on . Your 03 chevy has the IPC bus for data transfer from the BCM to the IPC . U codes are communication error codes .

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
The IPC determines that the BCM transmitted data to the IPC is invalid for greater than 12 seconds. The IPC sends a message to the BCM via the SPI serial data in circuit indicating that invalid data was received.
The BCM determines that the IPC transmitted data to the BCM is invalid for greater than 5 seconds.
The BCM detects that the SPI serial data in circuit is less than 1.2 v for greater than 5 seconds.
The BCM detects that the SPI serial data in circuit is greater than 4.5 v for greater than 5 seconds.
The BCM detects that the SPI serial data out circuit is less than 1.2 v for greater than 5 seconds.
The BCM detects that the SPI serial data out circuit is greater than 4.5 v for greater than 5 seconds.
The BCM detects that the SPI serial data clock circuit is less than 1.2 v for greater than 5 seconds.
The BCM detects that the SPI serial data clock circuit is greater than 4.5 v for greater than 5 seconds.

Your vehicle also uses class 2 data bus .

Class 2 Serial Data Link
The class 2 serial data link allows the following modules to communicate with each other:
• The body control module (BCM)
• The electronic brake control module (EBCM)
• The integrated radio chassis (IRC)
• The powertrain control module (PCM)
• The Remote Control Door Lock Receiver (RCDLR)
• The inflatable restraint sensing and diagnostic module (SDM)
The class 2 serial data link allows a scan tool to communicate with the above modules for diagnostic and testing purposes.

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1 Answer

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