Ive got a customer 04 GMC sierra 3500 6.0L and have replaced sensors the scanner said were bad and it still runs bad. I noticed it kept blanking out tyhe screen on my scanner. How di I check if the ECM is OK?

Asked by Roy Nov 19, 2018 at 01:40 PM about the 2004 GMC Sierra 3500 2 Dr Work Truck 4WD Standard Cab LB DRW

Question type: Maintenance & Repair

04 GMC 3500 Sierra 6 litre engine running badly at idle it misses terribly.
Under load driving, it has no power AND RUNS BAD MISSING. REVING IT
UP WITH NO LOAD IT SOUNDS GOOD. tHE CODE READER SAID THE AIR
FLOW WHICH I REPLACED. THEN THE MAP SENSOR CODE, SO I
REPLACED THAT. THE MAP SENSOR CODE IS BACK AND SO IS THE AIR
FLOW CODE AND I NOTICED THE SCREEN KEPT GOING BLANK ON MY
SCANNER, IM THINKING ECM, BUT HOW DO I TEST FOR THAT

1 Answer
44,000

Hornet_2497 answered 6 years ago

First, I would try a different scanner. Maybe check one easy to reach sparkplug to determine how bad the other ones are. Then check the air and fuel filters, and any new codes coming up.

Mark helpful

Your Answer:

Related Questions

Shortcuts

Search GMC Sierra 3500 Questions

CarGurus Experts

  • #1
    Jaime Moreno
    Reputation
    130
  • #2
    Courier_608
    Reputation
    70
  • #2
    outalne94z71
    Reputation
    70
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Silverado 2500HD
27 Great Deals out of 1,237 listings starting at $9,990
Used Dodge RAM 3500
27 listings starting at $13,888
Used Ford F-350 Super Duty
49 Great Deals out of 2,726 listings starting at $6,996
Used GMC Sierra 2500HD
25 Great Deals out of 1,539 listings starting at $8,999
Used Ford F-450 Super Duty
151 listings starting at $22,777
Used GMC Sierra 2500
2 listings
Used Chevrolet Silverado 3500
3 listings starting at $10,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.