Question about 1999 GMC Suburban

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1999 Suburban passlock security

Our security light is stuck on and now the charging light and check gauge light is on as well... it will turn over but will not hold fuel pressure to start

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  • GMC Master
  • 21,873 Answers

Not sure I am following you.
The security system is supposed to keep the engine from cranking if the correct key is not used.
The check gauge and charging light would be on until the engine starts.
You have checked fuel pressure with a gauge and you know the line is not pressurized when you crank the engine ?

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

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GM Elec
  • 1000 Answers

SOURCE: I have a 99 suburban that has 203,000 miles. It

I believe you have a fuel regulator weak or dirty injectors.
Try turning the key to the "on" position ( do not try and start) wait until fuel pump stops running (3-5 seconds or so ), turn the key off and immediatly repeat for 3 cycles. On the 4th key rotation, start the vehicle. Does it seem to start up faster?
If so, the regulator is weak, however, the fuel pump does have a check valve in it to prevent fuel from leaking back into the pump and maintain line pressure.
Try the diagnostic proceedure above first and we can go from there.
Good luck, let me know.
Regards,

Posted on Jul 15, 2009

emissionwiz
  • 76164 Answers

SOURCE: I had an issue with the passlock system. The

did you have the BCM programmed to the new key? the dealer has to do that.

Posted on Jul 27, 2009

  • 12 Answers

SOURCE: 1999 GMC Suburban, K1500 4WD. Top brake light bar

third light is different circuit. saftey reason check fuses grounds wires

Posted on Oct 11, 2009

Gort007
  • 1187 Answers

SOURCE: My 1999 GMC Suburban is hard to start first thing

Yup!
The fuel pressure valve is stuck open and drains the fuel (via gravity) back to the tank.
Check the fuel pressure regulator / replace.

You might want to put a bottle of "complete fuel system" cleaner ($8 AutoZone) in the gas (not diesel) tank, next fill-up. It may do the trick in a couple of days.

Posted on Oct 12, 2009

Testimonial: "Thanks for your reply! I'll add the fuel system cleaner tonight and check the pressure regulator this weekend. Thanks again."

  • 205 Answers

SOURCE: My 1999 GMC Suburban starts then dies BUT the

turn the key on and wait for the security light to go off about 10 to 15 minutes then turn key off and back on an try starting it. this usualy clears the pass key II system

Posted on Oct 15, 2009

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