2001 Chevy Suburban Starting issue

JTJONES

MEMBER
2001 CHEVROLET SUBURBAN
V8
2WD
AUTOMATIC
150,000 MILES

Hi Men,

Let me explain my problem. My vehicle hesitates to start, it always does but with protest. Today, it would not start at all, I kept trying and finally jumped it. It started strong but I got a "Reduced Engine Power" warning and the gas peddle had no affect. Turned it off and restarted and it worked fine, started with little to no hesitation. I checked my codes and got three, P1516, 7 & 8. I am thinking that the codes are a by product of the bad start and that the hesitation in starting; which seems to be getting a bit worse, is the real problem. Any thoughts? I am not really sure what these codes mean either. Thanks for your help!

In Him,
J T Jones

5 Replies

PEAR69

MECHANIC
1,482 POSTS

The P1516 code is a problem with the electronic throttle module throttle position.
Now is your question you mention a code of 7 & 8. Do you mean two more codes of P1517 and P1518? There is no such trouble code of just 7 and/or 8.

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Monday, March 3rd, 2008 AT 4:35 AM

JTJONES

MEMBER
4 POSTS

Hi,

Yes, I did mean code P1517 and P1518. Could this be the cause of the hesitation in start-up?

In Him,
J T Jones

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Monday, March 3rd, 2008 AT 10:13 AM

PEAR69

MECHANIC
1,482 POSTS

Yes, all of these codes are related to the electronic throttle module (or the TAC module). The wire connector at the module itself or the PCM (computer) is probably loose. This will absolutely cause your problem. P1516--Throttle Actuator Control (TAC) module position performanceP1517--(TAC) module performanceP1518--(TAC) module serial data circuit.� The P1518 leads me to believe that the electrical connector is loose. If not--I am going out on a limb and saying--You have a problem with your Throttle Control module. Let me know your findings. BTW--If I may ask--what does " In Him " mean?

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Monday, March 3rd, 2008 AT 8:21 PM

JTJONES

MEMBER
4 POSTS

I thought that might be the case. I have been trying to find a wiring diagram that will show me where these items are located. Money is tight and everything I have found so far is at a cost.

The "In Him" is a passive way of letting others know that I am committed to honoring my Lord. I strive to honor Him in all I do, not that I succeed, but I try. It is not my intention to push this at others so using "In Him" is benign to those who don't care or do not know who Him is. Thanks for asking as I enjoy to opportunity to explain! :D

I appreciate your help and support. I will continue to strive to find the TCM and PCM to check connections and will report back my findings when found. :)

In Him,
J T Jones

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Tuesday, March 4th, 2008 AT 10:38 AM

PEAR69

MECHANIC
1,482 POSTS

I found out some info that may help you. There seems to be --on some engines-- a problem with a wire leading to the TCM. It is a yellow wire and the problem is that it sometimes breaks inside of the insulation. Look for this carefully. This wire (and all wires for that matter) should be checked very closely. This break seems to occur within 6 inches of the TCM. The TCM is the Throttle Control Module. It should be located on the throttle body. � I also suggest obtaining a repair manual for your vehicle, if you haven't already done so. Haynes is a good one--but if you want the best info possible you can purchase a factory service manual.� BTW -� with the LORD on your side you will succeed in finding and fixing this problem. "In Him"--that's cool.