Check engine light when towing and speed > 60mph

Asked by Aug 14, 2015 at 05:47 PM about the 2003 Chevrolet Suburban 2500 4WD

Question type: Maintenance & Repair

The check engine indicator on my 2003 Suburban comes on periodically for a few
seconds.  This happens when I am towing a camper.  I have to first exceed 60mph,
then slow down.  When the engine is not under as much load, the check engine light
blinks on and off until it is under load again.  In other words, if I am accelerating or
maintaining my speed, nothing happens.  If I am coasting, the check engine indicator
blinks on and off.

This does not happen when I drive at or below 55 mph.  It also does not happen when I
am not towing the camper and driving at any speed.

5 Answers

89,005

As the light has came on it has stored codes, so swing by a parts store that can read the codes, write them down then repost them back here and someone will jump in and help you with diagnosing the problem.

There were several codes. The one I got this time and before is P0300 - cylinder misfire. I also got P1172 - fuel pump transfer flow insufficient - this time but never in the past when I had the codes checked.

89,005

First thing to do is change the fuel filter, it is located in the frame rail on the drivers side, then dump in a can of SeaFoam in the fuel tank. These codes could be related due to a fuel delivery or an injector problem, the Seafoam will clean thing up inside the fuel system, you should also check the spark plugs for any abnormal wear.

The fuel pump was replace in March 2014. The fuel filter was replaced in December 2015. Every long trip I take, I fill up with Premium from BP. Just did that a week ago. I doubt its the spark plugs but I can check that next.

89,005

I would still try the SeaFoam.

Your Answer

Add photo

Related Questions

  • My 97 suburban blows cold under 60mph 1 answer

    My 97 suburban blows cold air unless I'm over 60mph, then it blows heat. As soon as I begin to slow it blows cold again. As well, I noticed to defrost only blows on the passenger side. To top it...

    1997 Chevrolet Suburban

    -

    Maintenance & Repair

  • vibration @60mph 1 answer

    vibration @60mph changed 1 axel and lower balljoint both on left side seems somewhat better truck does have 285 tires on it we just got truck

    1995 Chevrolet Suburban

    -

    Maintenance & Repair

  • What would cause my van to shake at speeds above 60mph? 5 answers

    As I was driving down the highway I noticed a little vibration. The further I drove the vibration got worse. I know what an out of balance tire feels like and this definitely was not that. Any feed...

    2001 Chevrolet Express Cargo 3 Dr G1500 Cargo Van

    -

    Maintenance & Repair

  • Engine light 1 answer

    Was driving my 2009 chevy impala reached about 65-70mph on the freeway. Car jerked a little bit check engine light came on. Soon as I let off the gas light went off...accelerated again to the same ...

    2009 Chevrolet Impala LS

    -

    Maintenance & Repair

  • 08 Jetta Sputtering at 60mph not before 7 answers

    Have an 08 jetta that I just got an oil change on last week, it started to sputter today at 60mph mark, tested it 3 times, every time right at 60mph it would start to sputter, not before this mph.......

    2008 Volkswagen Jetta SE

    -

    Maintenance & Repair

Suburban

Looking for a Used Suburban in your area?

CarGurus has 18,545 nationwide Suburban listings starting at $2,395.

ZIP:

Search Chevrolet Suburban Questions

Chevrolet Suburban Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 940
#2 Eric Fritz
Eric Fritz
Reputation 860
#3 Neal Turner
Neal Turner
Reputation 820
View All

Related Models For Sale

Used GMC Yukon XL
252 Great Deals out of 11,801 listings starting at $2,400
Used Chevrolet Tahoe
612 Great Deals out of 27,547 listings starting at $600
Used GMC Yukon
407 Great Deals out of 16,272 listings starting at $1,800
Used Ford Expedition
396 Great Deals out of 24,281 listings starting at $1,951
Used Cadillac Escalade ESV
121 Great Deals out of 5,732 listings starting at $3,500
Used Cadillac Escalade
253 Great Deals out of 10,454 listings starting at $1,490
Used Chevrolet Silverado 1500
1,983 Great Deals out of 160,205 listings starting at $1,995
Used Toyota Sequoia
134 Great Deals out of 5,491 listings starting at $2,999
Used Ford F-150
2,401 Great Deals out of 210,250 listings starting at $895
Used Lincoln Navigator
91 Great Deals out of 5,496 listings starting at $3,900
Used Ford Excursion
12 Great Deals out of 700 listings starting at $3,995
Used Chevrolet Silverado 2500HD
336 Great Deals out of 26,379 listings starting at $2,500
Used Dodge Durango
244 Great Deals out of 22,762 listings starting at $1,499
Used Nissan Armada
125 Great Deals out of 8,615 listings starting at $3,200

Used Cars For Sale

2017 Chevrolet Suburban For Sale
6,638 listings starting at $37,036
2016 Chevrolet Suburban For Sale
43 Great Deals out of 2,749 listings starting at $35,000
2015 Chevrolet Suburban For Sale
26 Great Deals out of 1,359 listings starting at $28,888
2014 Chevrolet Suburban For Sale
15 Great Deals out of 563 listings starting at $17,990
2013 Chevrolet Suburban For Sale
44 Great Deals out of 797 listings starting at $15,499