Chevrolet Cars & Trucks - Page 7 - Recent Questions, Troubleshooting & Support


Does it have spark at the plugs ?

Chevrolet... | Answered on Nov 04, 2019


Could be bad ignition switch or some other type electrical problem . Knowing how this system works on your vehicle is the key . The ignition switch is a low voltage input to the BCM - body control module . Depending on key position the BCM knows what relays to energize and what messages to send over the GMLAN serial data net work , PCM - engine computer . Hooking up a factory or some other type professional scan tool to view ignition switch inputs to the BCM , an checking for BCM DTC'S - diagnostic trouble codes .

Circuit Description
Moving the ignition switch to the START position signals the body control module (BCM) through discrete inputs from the ignition transducer that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the engine control module (ECM)/powertrain control module (PCM) requesting engine start. The ECM/PCM receives a 12-volt signal from the park/neutral position (PNP) switch or clutch pedal start switch notifying that it is safe to start the engine. There is a splice on this circuit in the fuse block-underhood that supplies power for the starter relay coil. The starter relay coil control circuit is then grounded by the ECM/PCM closing the switch in the starter relay suppling 12 volts to the S-terminal of the starter. Ground is supplied through the engine block.


Plus you need to under stand what power modding is , because the BCM is the power mode master . This will sound funny to someone who does not know about automotive electronics .
Serial Data Gateway
The body control module (BCM) in this vehicle functions as a translator between the High and Low speed GMLAN busses. The 2 communication protocols use the BCM to translate communicated serial data messages between the control modules over the 2 serial data busses.
Power Mode Master
This vehicles body control module (BCM) functions as the power mode master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.

Power to many of this vehicle's circuits are controlled by the module that is designated the power mode master (PMM). This vehicle's PMM is the body control module (BCM). The PMM controls which power mode (Run, Accessory, Crank, Retained Accessory Power, or Off) is active.

On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits. The 3-wire Ignition Switch table below illustrates the state of these inputs in correspondence to the ignition switch position:
Relay Controlled Power Mode
The body control module (BCM) uses the discrete ignition switch inputs Off/Run/Crank, Accessory, and ignition 1, to distinguish the correct power mode. The ignition 1 circuit is also routed to the Run/Crank relay for relay controlled power feeds during the appropriate power mode. The BCM, after determining the desired power mode, will activate the appropriate relays for that power mode.

Chevrolet Cobalt... | Answered on Nov 03, 2019


Sounds like the ignition key mechanism has failed. Probably needs replacing. Has anyone been attaching wires to it? If so, they may have mixed up the wiring.

Chevrolet Cobalt... | Answered on Nov 03, 2019


On the steering wheel is the hand controls. Scanning is stuck because of dirt or something. Push the buttons, blow out dirt, wash it off. Mine worked fine after that. (How annoying up til then though. Hope this works. Russ Werth Bowman ND

1999 Chevrolet... | Answered on Nov 03, 2019


The obvious problem is it is not the correct one. Carefully compare the old one with the new one - if not the same, take the old one back to where you purchased the new one and get the correct one.

2003 Chevrolet... | Answered on Nov 03, 2019


I suspect you have a broken clutch drum or stripped splined shaft inside of the transmission. Even if the electronics failed you would still have 2nd, neutral, reverse, and park so the problem is most likely mechanical. Odds are pretty good that the transmission will need to be removed and repaired or replaced.

2004 Chevrolet... | Answered on Nov 02, 2019


It's when the security light starts flashing that the infamous "chip" in the key becomes a nightmare to many. Gradually the car begins not cranking anymore or if it cranks it would start and die in a second. Randomly it will do this more and more often until it won't start anymore. VATS, PASSkey and Passlock immobilizer systems are killing cars all over North America, they have a short lifespan and are certainly more effective against owners than thieves. Here is how you save your car
1st trick, Try a spare key that is newer or used less. The pins wear down and so do the keys causing security fail. 2nd trick, (if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my regal for more than a year. If its shutting down while running, im sorry i have no quick fix... If anything on this page helps you, please remember to comment or give me a thumbs up on the myfixya sight so i can have a better rating to help more people on this. Thanks

Cheap fix: Bypass the chip in your key. Temporary, but effective. Until the TDM (theft deterrent module) in the dash poops out, then you're kinda screwed. I was told that these types of key security systems have a 7-10 year life span. Sucks for us. This link explains the "Key Issue" pretty well.
----- http://vats.likeabigdog.com/


Never worry again fix: Bypass the whole VATS/Passlock/passkey I or passkey II system entirely. Literally take it out, and throw it away. I just did this in my Regal. Took about an hour. Took longer to find the thing than it did to fix the problem. They sell a unit for 200 bucks to totally bypass this system FOREVER. life time-money back and all that. Finally did this in my car. Well worth the 200 if you've looked into getting this replaced... Anywhere from 600-1000 bucks. If you do buy this, please purchase it thru this link. The cost is the same, but i get credit for the sale and im trying to earn my money back, as you will be able to do if you buy fron NewRockies and join the free affiliate program. Thanks
----- http://newrockies.ca?ap_id=judd0081 ----- With this fix, you can take that whole Vats, passlock, passkey system out of your car all together. Good info on both sites.

It works for:
Any GM or Isuzu Vehicle with VATS or PASSKey or PASSLock security systems.
If your car has the chip in the key or in the lock cylinder, then you can save it with this Full Bypass.
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2003 Chevrolet... | Answered on Nov 01, 2019


On the cover for the fuse/relay panel, there should be a diagram showing the purpose of each fuse/relay. This may also be shown in the owner's manual.

Chevrolet Cars &... | Answered on Nov 01, 2019


It is possible that it could be the key switch. Some connections or wiring might be lose in that area. Other than that it could be the wiring for the dashboard that could be loose. Loose wiring or loose ground may also cause this making it look like as if the power supplied by the battery is not enough. I would also check the dimming switch. It may also be loose or is going bad.

2004 Chevrolet... | Answered on Nov 01, 2019


Turn key to ON/RUN with engine off

Press the information and reset buttons on the Driver Information Center (DIC) at the same time to enter the personalize menu.

Press the information button to scroll through the available menu modes until the DIC display shows "OIL-LIFE RESET

Press and hold the reset button until the DIC display shows "ACKNOWLEDGED".
Turn the key to "LOCK/OFF".

2008 Chevrolet... | Answered on Oct 31, 2019


A company called Helm they print manuals

Chevrolet Cars &... | Answered on Oct 30, 2019


What is the CODE for.? The radio anti theft code.? I know that with my old Honda Accord the dealer had the code archived in their system. I changed my battery and had to have the code to put in the radio.. I called the car dealership that sold me the car. All I had to do was give them my information and they looked up the code ID..
I would imagine that GM automobiles work the same way. I hope this helps you..

1999 Chevrolet... | Answered on Oct 30, 2019


1. ENGINE COMPARTMENT RELAY AND FUSE BLOCK


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Chevrolet Cars &... | Answered on Oct 30, 2019


I believe it is a 3/4" nut and steering wheel puller should do the trick.

1986 Chevrolet... | Answered on Oct 29, 2019

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