Question about 2000 Chevrolet Blazer

2 Answers

Gauge or sending unit in 2000 Blazer...

If the circuit board failed, would it still dart back and forth or would it just stop? How would I replace it, is it behind the dash or somewhere else? Thanks.

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

This sounds like it could be your problem. There is a TSB #3777 that deals with the following problem: The fuel gauge and temp. gauge are inop and the low fuel and battery lights are on. The PRNDL indicator is inop on A/T vehicles. These systems can be intermittent. When using a scan tool the inputs are normal when viewed on the power train data list, but read zeros when viewed in the I/P data list. The gauges will sweep when using a scan tool. This can be caused by an open in cicuit 241 to the VCM connector C4 pin 13. This is the ingnition 3 feed to the VCM. It is one of the inputs used to determine the ignition lock/switch position. When this circuit is open the VCM sees the switch as always in the crank position, while in this mode the class 2 serial data is in a reduced function state, the Tech 2 will still communicate with the various modules and no DTCs will set. The following is a matrix indicating what inputs are used to determine the ignition switch position at the VCM.


Ignition 0

Ignition 1

Ignition 3










Check for B+ at the VCM connector C4 pin 13, this circuit 241 should only have battery voltage when the ignition switch is in the run position.
Note: Both the 2WD and 4WD S/T vehicles with a 4.3 L engine use fuse #15 (4WD) in the IP fuse block and the related wiring (Circuit 241) to the VCM for this crank input.
Safety Note: Before working on wiring be sure to ground yourself or static discharge may fry the circuit bored.

Posted on Dec 12, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,263 Answers

Chances atre if it was the whole board you whould not have a speddometer or anything. there are seperate modules on the board it sits behind the dash. when removing it you want to be careful. if you have a static charge and it discharges on the board you will fry it. i use a bracelet that has a longe wire with an alligator clip and i attach it to a ground that way the charge will ground to the vehicle body and not the board. please rate this thanks

Posted on Sep 01, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What would cause the gas gage not to work in a 93 bronco?

Nine times out of ten, rust in the gas tank has caused the sending unit to rust. WD-40 (large amounts of it), sprayed into the sending unit, usually fixes that.
Also, if I'm not mistaken, the 93 Bronco has a "Low Fuel Light" circuit right next to the gas gauge. If that circuit fails, the gas gauge will also fail.
Start by seeing if you have voltage to the gas gauge circuit with the ignition key on. If you do not, replace or clean the sending unit. If you do, replace the Low Fuel Light circuit plug-in.

Jul 22, 2014 | Cars & Trucks

1 Answer

I have a S10 Chevy my oil pressure gauge going s back and forth 40 & 60 driving stopping somethings below 40

Could be normal.
Idle RPM pressure is lower than say 2000 RPM
You could replace the sending unit or have the actual pressure checked with a mechanical gauge.

Jul 06, 2012 | Chevrolet Cars & Trucks

1 Answer

Gas gauge dont work jumps back and forth is there a ground?

if it jumps really fast you probably have a bad gauge/instrument cluster. if it moves back and forth with a slower/normal rate of movement you probably have a bad fuel level sending unit located in the tank.

Mar 23, 2010 | 2000 GMC Jimmy

4 Answers

What should I check when the ''service engine'' light goes on in my 2000 chevy blazer? I have also had trouble with the gas gauge. It moves back and forth between half a tank of gas and then it shows...

Advanced Auto Parts and Autozone will check your OBDII for free (On Board Diagnostic System). They will give you a print out of what the code(s) are and possible solutions.
As for the gas gauge, you might check the sending unit from fuel tank and possibly the float in the tank. This requires dropping the tank, you may not be set up to do this work, so find a qualified shop in your area.

Nov 27, 2009 | 2000 Chevrolet Blazer

2 Answers

Fuel gauge stopped working

check for a loose connection, otherwise the sending unit in the gas tank may be defective.

Aug 04, 2009 | 1999 Chevrolet Blazer

1 Answer

Erratic fuel gauge

Check sending unit in tank. My newer Envoy (2005) did the same thing. Unfortunately, they have to drop the tank to replace it and it considerable labor $$ to R&R.

May 19, 2009 | 2000 Chevrolet Blazer

2 Answers

Fuel gauge problem

there is only one part that makes this happen, it is the fuel gauge sending unit in the fuel tank.

May 13, 2009 | 2000 Chevrolet Blazer

2 Answers

Gas Gauge Problem

the problem is the gas tank sending unit is defective, u will have to remove the gas tank and replace it, there is no other cause of this type of problem.

Feb 09, 2009 | 2000 Chevrolet Blazer

4 Answers

Gas Gauge or Sending Unit

more than likely it's the gauge it sets in a circuit board and sometimes the contacts get worn and with vibration it voltage spikes it and then it fails. very seldom is it the sending unit in the tank. please rate this...thanks

Sep 01, 2008 | 2000 Chevrolet Blazer

Not finding what you are looking for?
2000 Chevrolet Blazer Logo

419 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides