20 Most Recent 1998 Pontiac Grand Prix Questions & Answers

The following instructions will allow you to reset any GM (General Motors), Cadillac, Oldsmobile, Buick, Pontiac theft lock radio.

Requirements: the theft lock radio must be in "LOC" mode.

1. Turn the ignition ON (The radio should display "LOC")
2. Hold down the Radio Presets 2 and 3 buttons for six seconds
3. The radio display changes from LOC to a three-digit number. Write this number down. You now have fifteen seconds to complete the next step.
4. Press the AM/FM button
5. The radio display changes to another three-digit number. Write this number to the right of the first one.
6. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05
7. Call 1-800-537-5140
8. Press 1 then # (pound). You'll hear "Invalid Code, try again"
9. Press 139010 or 106010 or 206010 or 202107 then # (pound). You will be asked to enter your four or six digit code followed by *
10. Enter the number from STEP 6 then *
11. Listen to the four-digit number and write it down. It will be repeated twice
12. Turn the ignition ON (The radio displays LOC)
13. Use the MN and HR buttons to enter the code from STEP 11
14. Press the AM/FM button. The radio display changes to "SEC". Your radio is now "un-locked" and usable.

If you fail to enter the correct code eight times, the radio goes into INOP mode. You have to wait an hour with the ignition on before the radio returns to LOC mode.

Hope this helps; keep in touch.

1998 Pontiac... | Answered on Jan 22, 2020

There isn't one. It's controlled by the BCM. You have a shorted wire or the switch is bad. Pop the switch out and unplug it. If it still happens(shorted wire) open the trunk and pull the plug off the latch.

1998 Pontiac... | Answered on Feb 27, 2019

Have you performed work on the vehicle lately? Had the console out (assuming a floor shifter) for any reason?
If yes, it is possible that you have the cable (between ignition switch and shifter) out of adjustment.
If you suspect the brake pedal switch, are the brake lights also stuck on? Do the brake lights illuminate when you depress the brake pedal? Will the cruise control set? Use these three questions to troubleshoot if the pedal switch is functional.
If this just suddenly began, then I would suspect the brake pedal switch.

Try these things and report back for assistance.


1998 Pontiac... | Answered on Feb 08, 2018

I had the same problem on my 2002 Pontiac Grand Prix GT. I sent my radio out for repair of illumination. You can find online places that will provide shipping labels for sending the radio in and returning it back to you.

1998 Pontiac... | Answered on Dec 18, 2017

Might be your fuel pressure regulator.. also your car might be vapor locked.Next time it shuts off loosen your gas cap... If you hear it sucking in air... that's your problem...or your catalytic converter is clogging up...check the sensors on the pipes..If there bad it tells your car it needs more gas when it really don't...you will smell gas

1998 Pontiac... | Answered on Nov 10, 2017

What is the vacuum reading from the engine in inches of vacuum?

1998 Pontiac... | Answered on Nov 09, 2017

Most likely one of the blend door motors or wiring/ connectors. Check the plugs first. You will most likely need to remove the floor duct work to get to them.

1998 Pontiac... | Answered on Aug 19, 2017

Your ignition switch is bogus. High speed runs directly off the speed control but the lower speeds go thru the ignition switch. Do not know why but that is the way it is!!!!!!!!
Replace the ignition switch and you will be back in business.

1998 Pontiac... | Answered on Jun 20, 2017

The closed park position switch within the automatic transaxle supplies voltage to the steering electric park lock. The energized electric park lock pulls the mechanical lock in the ignition key cylinder away from the cylinder. The ignition key can then be turned to the LOCK position. The key can then be taken out of the cylinder.

I have 11.53v on the power side and ground side to battery has 11 ohms ? do a voltage drop test on the ground side not ohms . Do you know what voltage drop is ? Learn the right testing procedure , you could have broken wire strands inside the insulation , apply current an the circuit won't work correctly , but would show ok with ohm test's .
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Electric Testing Techniques You Need to Know

1998 Pontiac... | Answered on Jun 16, 2017

Sure sounds like rusty rocker panels.When it rains water at the windshield drains into the rockers and out along the bottom of the rocker panels.If they are showing rust on the outside they are rusted on the inside.

1998 Pontiac... | Answered on Jun 02, 2017

first check the wire going to the sensor, give it a good clean on the conditions. if this does not sort the problem it could be because of the oil change, muck in the oil could of gotten into the sensor, you maybe able to clean it out but you may need to replace it. when an oil change is done they would put a cleaning agent in with the oil, this loosens any burnt oil off the engine, this burnt parts can stay in the engine and float around and even block the pressure sensor.

1998 Pontiac... | Answered on May 30, 2017

probably didn't connect the tacho wire to the right side of the coil for the first problem
because the engine was replaced it is possible that a sensor wire to a wheel for the traction light was damaged /disconnected

1998 Pontiac... | Answered on May 05, 2017

Do you know how to do automotive electrical testing , checking B+ power and ground circuits , using voltage drop ? Do you know how to read a wiring diagram ? Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Electric Testing Techniques You Need to Know

How to read an electrical diagram Lesson 1

http://www.bbbind.com/free_tsb.html find wiring diagrams here !

The day time running lights module , ambient light sensor , would be a good guess but that's all it would be .Do you know what these are ? Really don't think there is a short in the multifunction switch . Maybe it's time to take to a qualified repair shop , dealer ! Cadillac or Buick .

Daytime Running Lamps (DRL)
The Daytime Running Lamps (DRL) control module is designed to automatically operate the exterior lights depending on the outside light conditions.
The DRL control module operates in 2 modes:
• The day mode
In the day mode, the DRL control module turns ON the low beam headlamps at a reduced intensity when the DRL ambient light sensor detects daylight under the following conditions:
- The ignition switch is in the RUN position.
- The headlamps are OFF.
- The park brake is OFF.
• The low light mode
In the low light mode, the DRL ambient light sensor detects darkness, turning ON the low beam headlamps to full intensity through CKT 10.
Additionally, the DRL ambient light sensor turns ON the following lamps through CKT 9:
- The park lamps
- The side marker lamps
- The license lamps
- The tail lamps


1998 Pontiac... | Answered on Mar 25, 2017

Doesn't have one transmission is all electronicly controlled !

1998 Pontiac... | Answered on Nov 30, 2016

There is a vacuum hose connected to it on the passenger side of the transmission It is a silver colored round in shape about 2 inches in diameter.

1998 Pontiac... | Answered on Nov 09, 2016

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