Question about 1999 GMC Sonoma

1 Answer

20amp fuse in black box keeps blowing

20amp fuse in the black box under the hood keeps blowing. It is labeled ECM B. Iam told it is tied to PCM and VCM. After it blows the truck dies and when you turn the key back to the on position there is no fuel pump sound and the check engine light does not come on. After I change it everything is fine. A few days later with no warning it blows again. iam told it "might" be a short in the fuel pump itself but don't want to change the pump and find out this has been a problem and all it is, is a short in a wire somewhere else. Any experience or help with this problem? Thanx in advance

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,011 Answers

Dear,


The fuse ecm b it tied to the fuel pump, PCM, and VCM.
Fuel pump could have an internal short
check it by the way...

regards,

Posted on Oct 28, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
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.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 2000 Buick century custom and I had drained my reservoir. Now everything I attempt to start my car my pcm fuse blows instantly. I've replaced my ignition switch and fixed my ignition column yet...


pcm fuse blows instantly ???? What number fuse , how many amps ? Where is it located ? under hood fuse box . ECM fuse 10amp ,underhood fuse box ???? When does the fuse blow ? when you turn the key to the start position . How about when you turn it to just on position ? Replacing the ignition switch an the column ????? Why did you replace these ? You think it was going to fix the problem ? or someother problem ? Bad computer maybe .

Sep 16, 2017 | Buick Cars & Trucks

5 Answers

20 amp ECM B fuse


check again the fuel pump. check the resistance if too low. or unplug the pump and put a fuse again, if the fuse will not blow, then the pump went bad again.

tnx 4 using fixya,

drcool

Oct 27, 2008 | 1999 GMC Sonoma

1 Answer

Have a 1999 Dodge Avenger V6. Keeps blowing Engine Fuse under hood


Fusible link 3 feeds the PCM. the ASD relay, and fuel pump relay. Assuming it has A/T, that fusible link also feeds the starter relay, the EATX-ECM, and the EATX relay. A short in any of those elements could be causing the trouble.

Dec 16, 2016 | 1999 Dodge Avenger

1 Answer

What could cause both nospark and fuel together at once,one conponet responsible for both failures


Hi Bill , what engine does yours have , 4.3 , 5.0 , 5.7 ,6.5 L ? Check fuse's ECM 1 20amp an ENG 1 20amp in the under hood fuse relay box !

Mar 27, 2015 | 2000 Chevrolet Express Cargo

1 Answer

How can I fine the ECM reset fuse in my 2005 cadillac cts fuse box


If it is in the fuse box it should be labeled PCM. If it isn't there it may be in a wiring harness under the hood.

Oct 14, 2012 | 2005 Cadillac CTS

2 Answers

I need a diagram for the under hood fuse box. More importantly the specific 20 amp fuse labeled F21. What is it for. I have a 1998 jeep wrangler 4.0 4wd.


Are you sure that this is for 20AMP, according with the repair manual, the position 20 in the Power Distribution Center if for Power Motor ABS Pump, and is 10AMP.

Verify it..

Mar 17, 2010 | 1998 Jeep Wrangler

3 Answers

Which fuse controls the cigar lighter and acc. power outlet, It's not labeled in the owners manuel or fuse panel schematic


The fuse you are looking for is in the underhood fuse box. its labeled CIG. A phone charger is the most common cause of the fuse blowing.

Oct 15, 2009 | 2006 GMC Sierra

2 Answers

Chevy avalanche won't start


another person wrote this, I was trying to find more info for you.

I'm answering my own post so other's may reference. The problem was my Powertrain Control Moudle (PCM) kept blowing out due to a bad fuel pump.

so if you are inclined to check, your fuel pump can still work and not work correctly. So this needs to be tested under correct measures. More than likely on the truck. But I would locate the PCM and check to see if its blown.

If I find anything else I will forward it to you.

tepfy

Feb 03, 2009 | 2003 Chevrolet Avalanche

2 Answers

Blowing fuse


it's not the fuel pump, you have a short to ground somewhere in that circuit.

Oct 28, 2008 | 1999 GMC Sonoma

Not finding what you are looking for?
1999 GMC Sonoma Logo

649 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

77169 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

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

Answer questions

Manuals & User Guides

Loading...