Question about 2000 Pontiac Grand Prix

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My boost gauge on my 2000 pontiac gtp does not work?

How do I fix it or see what's causing the problem?

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  • Pontiac Master
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Does it light up on the cluster, but doesn't move? This would be a sensor or wiring or ECM problem. If it doesn't light up in the cluster, it would be a cluster problem. Most likely a cluster problem. No lights.

Posted on Nov 15, 2014


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Posted on Jan 02, 2017

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SOURCE: how do you repair P0446 trouble code on a 2000

P0446 - Evaporative Emmission Control System Vent Control Circuit
Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.

Symptoms: There will be no obvious symptoms to driver, other than MIL illumination.

Causes: A code P0446 could mean one or more of the following has happened:
* Faulty vent valve
* Open, short or excessive resistance on Vent valve control circuit
* Blockage of vent valve
* Bad PCM

Possible Solutions: With a P0446 OBD-II trouble code, here are some things to try:
* Replace Vent valve
* Repair open, short, or resistance problem in control circuit
* Repair open, or short, or resistance problem in power circuit
* Replace PCM

Review this information, Test it and tell us news.

Posted on Feb 15, 2011

  • 491 Answers

SOURCE: replace headlight bulb

inside the engine compartment directly behind the headlight it unscrews and pops out. then put it back in and retighten.

Posted on Oct 11, 2008

  • 14036 Answers

SOURCE: 2000 Pontiac GTP starts then shuts off

body control module. goes bad. it turn off fuel pump . disable car from think some one stealing car so .it want even crank .dealer ship have to replace it . not a cheap fix. they have to reprogram car .once they replace it.

Posted on Mar 17, 2009

  • 3854 Answers

SOURCE: boost issues

No leak, it may be time for a service to your supercharger. There is maintance that most people don't know about and the bearing to the supercharger's wear out and then has play. The bad things is with the play the lobes in the supercharger starts to rub against the housing and then the tolerace clearance is larger then when the car was new. Long story short, time to have your supercharger rebuilt before it fails and kills the engine too. There is an other way you can look in too, here is there web page Good luck

Posted on Apr 07, 2009

  • 1 Answer

SOURCE: Looking for rocker panels for 2000 pontiac grand

Rocker panels for the 97-03 Grand Prix 4 door are available here:

Rocker panels for the 97-03 Grand Prix 2 door are available here:

Posted on Jun 30, 2009

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I have a 2000 gtp my boost gauge doesn't work it lights up but doesn't show any boost at all. I've replaced the solenoid and the boost actuator. Sometimes while I'm driving it'll reach full boost out of...

Sounds Like It,s Needing to Be Replaced Again it,s JUNK too Keep Me Informed On What YA Do or Not But Needs Somin done Soon You Might HAve More Problems If this Don,t Get Fixed thks Again

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Sep 21, 2012 | 1999 Pontiac Grand Prix GTP

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I got a 2000 pontiac grand prix gtp the car runs well but the boost level will not go more than 1/4 on the gauge, one mecanic said to change the spark plugs because they are 4 or 5 years old (iridim...

The spark plugs have absolutely nothing at all whatsoever to do with boost levels.

However; change them anyway because new plugs are always better. In the GTP, don't use the iridium plugs, use copper core. I highly recommend Autolite 605's, gap them to .055"

In the GTP, spark knock is a common, performance robbing issue because of the supercharging. You'll lose 5-6 horsepower for every degree of timing ****** that the engine computer will employ to prevent the spark knock. If you use copper core plugs though, this problem will be less likely because copper dissipates the residual heat much faster than iridium, so that only the electrode spark alone can be hot enough to ignite the fuel. The only other difference between the plug types is how long they last. Iridium plugs were the originals only because they last longer...they offer no performance benefit to the GTP.

Now on to your actual question.

There only a few causes for loss of boost pressure in the GTP, all of which are an easy fix.

Supercharger belt slip, disconnected or damaged boost bypass valve hoses, or maladjusted boost bypass valve linkage.

The easiest thing to do first is the boost bypass valve adjustment. This will produce results even if you DO still have belt slip or a leaking hose.

Locate your boost bypass valve. You will find it mounted directly in front of where the throttle body bolts into the intake plenum.
You will see that it is held in place by three bolts. Loosen them in this order; left, right and rear. You will find that you'll need a 4" extension socket to reach the rear one. Hold your socket on that one while you push down on the valve body. As you may notice the mounting bolt holes are elliptical, allowing for the height adjustment. You can use this as a visual reference for how far to push the valve down. You shouldn't push it down all the way, only about a half an inch will suffice.

What the adjustment does is reduces the amount of throttle opening needed to produce boost, by shortening the travel length of the valve lever that is attached to the throttle. When properly set, it will allow about 11 to 11.5 PSI at wide open throttle, or just short of wide open throttle. In any circumstance you may also notice that your GTP is a little quicker from a standing start after the adjustment.

Jun 26, 2011 | 2000 Pontiac Grand Prix

1 Answer

I have a 2002 Pontiac GTP.I have noticed today on the Interstate that the booster is not performing when i give gas to pass somebody,any idea what the problem could be?


Oct 06, 2010 | 2002 Pontiac Grand Prix

1 Answer

2000 Grand Prix GTP supercharger fluctuates when accelerating

There is no wastegate.

Change the spark plugs and pay special attention to the plug on bank 3. Look for physical damage on the electrode...cracked, bent etc.
Use Autolite 605's copper core gapped to .055" and NEVER run less than 92 octane.

Apr 02, 2010 | 2000 Pontiac Grand Prix

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