Question about 2000 Chevrolet Impala

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My car just will not start bcm?

My car will not start sometimes but I have power. Could it be my BCM? My gas gage also doesn't work and my gauges to......HELP ME!!!!

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  • chevygirl197 Oct 08, 2008

    My boyfriend think's that is my bcm. Or the fusible link? What do you think.

  • chevygirl197 Oct 08, 2008

    Well I'm taking your opinion and going with that. Thank you very much. I hope this solves my problem. Thanks.

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Sounds like your ignition switch. NOT the key switch, the igintion switch. It works off the key cylinder to allow or not allow power to your components. Like radio, gagues, starter, ignition, wipers etc. If the switch is going bad, you may have power to some or none of those components with key in on position.

Posted on Oct 07, 2008

  • Steven Brock Oct 08, 2008

    I told you my opinion from my experinces. I can't say for sure what the problem is unless the car is here in front of me.

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2002 chevy malibu cranks wont start. fuel and temp gauge dont work. radio reads cal


Cranks won't start , Did you check for spark ,fuel pressure ?
Radio Setup .Will the vehicle communicate with a scan tool ? Fuel an temp gauges not working are probably bad step motors inside the instrument cluster that controls the gauges . Where do the gauges read 0 or something else ?
Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the engine coolant temperature. The BCM converts the engine coolant temperature 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 engine coolant temperature gage defaults to 38°C (100°F) or below if:
?€¢
The PCM detects a malfunction in the engine coolant temperature 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.

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.
DTC P0462
The fuel level sensor changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine fuel level. When the fuel tank is full, the sensor resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the body control module (BCM). The BCM converts this data and sends a fuel gage percent deflection to the IPC via the serial peripheral interface (SPI) in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Have
For the DE 100 series radio, complete the following procedure, using a scan tool, in order to properly set up communication:

  1. At the Main Menu screen, select: Diagnostics.
  2. At the Vehicle Identification screen, select the following options:
  3. ?€¢
    Model Year


    ?€¢
    Passenger Car

  4. At the System Selection Menu screen, select: Body.
  5. At the Vehicle Identification screen, select the Platform type.
  6. At the Body screen, select: Radio.
  7. At the Radio screen, select: Special Functions.
  8. At the Special Functions screen, select: Radio Setup.
  9. At the Radio Setup screen, press ENTER. The following test will set up a new or existing radio.
  10. Select one of the following options:
  11. ?€¢
    USA/Canada


    ?€¢
    Export

  12. Press the ENTER key.
  13. Verify that the scan tool displays "Test in Progress."
  14. Verify that the scan tool displays "Test Completed Successfully."
  15. Press EXIT on the scan tool.
Important: The radio set up will configure the following systems:
?€¢
LEARN VIN


?€¢
Diagnostic Trouble Codes


?€¢
Class 2 Radio Messages


?€¢
Country Code


?€¢
Chime Volume


?€¢
Chime Level


?€¢
12/24 Hour Clock

Without learning the VIN, the radio will display a locked message (LOC).
The radio setup procedure will also clear the following messages:
?€¢
CAL


?€¢
CAL ERR


?€¢
CALIBRATE

May 29, 2016 | Cars & Trucks

1 Answer

I have a 2002 bravada and when I was driving I turned radio off and now I have no windows,radio,locks,fuel gauge,oil gauge.checked fueses and they were ok,any suggestions?


Does it start an run ? Your best bet is to take it to a ASE certified repair shop ! All the things not working are controlled by the BCM body control module an are on the class 2 serial data bus , would be best to have hooked up to a factory scan tool to see if there are any DTC'S - diagnostic trouble codes stored . The instrument cluster gauge information comes from the PCM / ECM - engine computer over class 2 data bus .
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:
The instrument panel cluster (IPC) displays the engine oil pressure as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 psi (0 kPa) or below if:
The Body Control Module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be:
?€¢
Sensors and switches that are directly connected to the BCM


?€¢
Class 2 serial data received from other control modules connected to the class 2 serial data link.

The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message.
You best bet is to take it the dealer or a ASE certified repair shop !

Jan 03, 2016 | Cars & Trucks

1 Answer

Where is the tempature guage sensor


The temperature gauge sensor as you call is for more then just the temperature gauge . The temp. sensor is an input to the PCM -engine computer ! If it were bad you would have drivability problems , the transmission would not shift correctly an the check engine light would more then likely be lit .
Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the engine coolant temperature. The BCM converts the engine coolant temperature 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 engine coolant temperature gage defaults to 38?°C (100?°F) or below if:
?€¢
The PCM detects a malfunction in the engine coolant temperature 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.


Your gauge is more suspect then the sensor . gm had a problem with stepper motors that control the pointer for the gauge !

Sep 01, 2015 | 2001 Chevrolet Chevrolet Malibu LS

1 Answer

Why are all gauges on dash not working.only fuel guage


Usually when these Gauges go out it is because of a faulty BCM( Body Control Module) The BCM controls all dash instruments . If it is the BCM you will have to get a dealership to flash the new one. Before doing that though check all fuses under hood and inside. It should say gauges or BCM

Feb 18, 2015 | 2004 Chevrolet Avalanche

1 Answer

Gas gauge dose not work on 2007 chev malibu


That 2007 may be part of the BCM issue do a search see it it has that recall if so that may be the problem. The BCM controls alot of the electronics including dash cluster. We traded our 2011 malibu because the dealer didnt have the parts yet and the BCM was causing the car to start intermittently and the dash cluster needles to jump around.

Oct 18, 2014 | 2007 Chevrolet Malibu

2 Answers

I have a 2003 chev silverado. The fuel gauge quit working then started working again on an off. Then my radio would go out and the fuel gauge would start working. Now my AC is not working. It's like...


It may seem like the problems are related, but they most likely are not at all, unless it's an actual battery power issue. Your fuel gauge consists of 2 parts and wires to connect them, the sending unit, which is in the gas tank connected to your fuel pump on your truck I believe, and the gauge itself inside your dash. It is most likely your sending unit/fuel pump which sucks cause that's like $350, altho easy enough to replace yourself with very little gas in the tank. As for the radio check fuses, and AC I have no idea...

Jul 07, 2014 | 2003 Chevrolet Silverado 1500

1 Answer

My gages not working


Do you have power on the 10amp CLSTR fuse and the 10amp BCM-clu fuse ?

Feb 04, 2014 | 2003 Chevrolet Cavalier

1 Answer

HI, MY CRHYSLER CONCORD 94 DOESNT TURN ON THE PANEL LIGHTS OR DASHBOARD LIGHTS TO ILUMINATE THE GAUGES, SPEEDOMETER, GAS FUEL ETC. HEAD LIGHTS, INTERIOR LIGHTS WORKS FINE. SOMETIMES IT WORKS BUT WHEN I...


Tengo el Mismo problema, es un falso en los cables de el BCM, esta en el lado del pasajero, aun lado de la guantera. Intenta quitar la tapa del aire que da a la puerta lado del pasajero, muebe un poco el ducto y podras ver los cables del BCM, intenta moverlos, a mi me funciona

Aug 29, 2010 | 1994 Chrysler Concorde

1 Answer

Speedometer on my 2004 Tiburon works thens cuts down to zero. Gas gauge is doing the same thing. Just put gas in drop down to empty yet still has gas in it.


Clean the connectors on the back of the BCM and on the back of the gauge cluster.

If that doesn't work, then it could be:
- Fuel Sender & Vehicle Speed Sensor (should cause your "Check Engine" light to come on)
- Gauge Cluster
- BCM

You'll have to diagnose each of these possibilities.

Jan 16, 2010 | 2004 Hyundai Tiburon

1 Answer

Looking for location of bcm on 97 astro van dash


The BCM is located immediately above the heater controls inside the dash on my 2004 Astro. I know it controls the headlights and locks but not gauges. Haynes says the gauge fuse supplies it power....but I'm not going to bank on that one.

P/N 15081796 from Napa $115

Good Luck

Nov 23, 2009 | 1997 Chevrolet Astro

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