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'99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635

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New User

Apr 19, 2009, 7:54 AM

Post #1 of 7 (7313 views)
  post locked   post icon '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

Mad Hello there, I have had lingering issues with my '99 Pontiac Grand Am GT, it has the V6 3.4 L engine, approx. 110 k miles. I am worried it has reached the end of the line!!

It really looks beautiful still, despite the cracked dashboard and needing a paint job, but I don't want to give up on it yet. My check engine light was on, its been awhile, but recently my car would not start when I went to leave work.

A couple of weird things have happened in the past (to say the least!) with my ride. A few occassions when the car would not start my trunk would pop up when I tried to turn the ignition. This just happened again a couple of days ago.

Last week a friend of mine who is more mechanically inclined took a look at it for me and deteremined, using a multimeter and a circuit tester, that something was draining my battery, even though I did NOT have the key on and we could NOT find anything in the car that was on. We checked all the lights, the dash, the signals, everything electrical that we could find that I have control to turn off or on, and it all seemed like it should be off.

What my friend figured out was that this may be something related to my BFC Batt fuse for the Body Computer. Basically if I pull that fuse out, then the drain on my battery when the key is out and nothing is on is an 'acceptable pull' to quote my friend.

What I had been doing for the last week is to unhook my battery everytime I get in and out of the car, but that is getting pretty old. Yesterday my friend came up with the idea to remove the fuse instead of fuss with the battery everytime.

Anyway my friend had me drive to an autostore last weekend (I went to 3 actually, all w/the same result) and ask them to check the pull. All the shops hooked up this machine and they were getting the same code "check connections" but my battery terminals were connected properly. I even went the extra step of removing the terminal ends - which is just a screw or bolt actually, and soaking them in soda for hours and spraying with battery cleaner and a wire brush. I then went back to the auto store and the machine was sayiing "check connections."

THe first shop I went to the guy wanted to give me a new battery at first, but I had JUST got one from the same store that day as the one I had bought had a 36 mo. warranty but I only had it for about 10 mo. before the battery got so drained that I could not start the car w/o a jump. A 2nd guy in the store came out and said it wasn't the battery, which he recognized was brand new, but he could not figure it out either, just said that something must be draining my battery, which is more then the other 2 stores said. They simply told me "the battery is good" after the "check connnections" error message went away after a few attempts.

As an aside, my battery is side mounted and I wanted to buy some new bolt/terminal connections, but NONE of the stores I went to had the exact same size, I guess I have to go to the dealer. My friend recommended I do this, but that this is not causing my other problems.

New User

Apr 19, 2009, 8:02 AM

Post #2 of 7 (7304 views)
  post locked   post icon Re: '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

Mad also I was driving to work and I had almost a full tank of gas, but my fuel gauge fell to zero and the dash started chiming like I was out of gas. This is the 2nd or 3rd time this has happened to me in the last three weeks.

Also when we determined the cause was related to the body computer/fuse when we had the circuit tester hooked up to my battery there was a ticking noise coming from my glove box, it sounded like a bomb!?! Crazy tick tick tick tick

I mentioned this to my wife, since she used to drive my car on occasion, and said she had the same thing happen to her in my ride several months ago. SHe was at the store just down the street (I was out of town working that day) and she went to start the car after shopping and it wouldn't start, but the trunk popped open on her and she heard this ticking noise from the glove box and she said it sounded like a bomb!$!

I always thought my car was "the bomb" not "a bomb" but I digress. she had to have her uncle come and give her a jump before she could start the car and get home.

Finally I got a OBDII code reader and came up the following codes:

P0122 $10 - Throttle/Reduc Position Sensor Switch A Circuit Low
P0452 $10 - Evaporative Emission System Pressure Sensor/Switch Low
P1635 $10 - Manufacturer Control - (??? what is this?)

Can anyone shed some light onto these codes for me please? I am wondering if this is something that I can try to fix myself (with a little help from some friends, of course).

ALso if you think these codes are related to the car problems I am having and any idea on possible time/costs, would be greatly appreciated. I am about to throw in the towel, but I hope that someone out there can offer me some advise. I am educated, but not mechanically inclined.

Thanks in advance.


Apr 23, 2009, 3:36 PM

Post #3 of 7 (7285 views)
  post locked   Re: '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

First let us start with the fact that most of your codes are INCORRECT

DTC P0452 Fuel Tank Pressure Sensor Circuit Low Voltage

The fuel tank pressure sensor is used in order to detect a vacuum decay or an excessive vacuum during the EVAP diagnostic routine. The fuel tank pressure sensor responds to the changes in the fuel tank pressure or vacuum. The signal voltage to the Powertrain Control Module (PCM) varies from a minimum of about 0.2 volts with pressure in the fuel tank to above 4.0 volts with a high vacuum in the fuel tank.
The fuel tank pressure display on the scan tool has an auto zero feature which occurs at each ignition cycle and is corrected according to the barometric pressure. Because of this, the fuel tank pressure may not accurately reflect the actual output of the sensor or the conditions within the fuel tank.
DTC P0122 Throttle Position (TP) Sensor Circuit Low Voltage
DTC 1635 5 Volt Reference
The PCM uses the 5 Volt Reference A circuit as a sensor feed to the following sensors: • The TP sensor. • The MAP sensor. • The EGR Valve Pintle Position sensor. • The Fuel Tank Pressure Sensor.
The PCM monitors the voltage on the 5 Volt Reference A circuit. If the voltage is out of tolerance, the PCM will set DTC P1635.
In essence all of these codes share a common thread which is that there is an issue with the 5 voilt reference circuit i.e., there is something that could be taking down the 5 volt reference line.
As far as the BFC fuse you should isolate the source is it the BCM or is it something the BCM powers up on the RAP circuit or retained accessory power circuit.
I would highly recommend that you consider taking this vehicle to a professional, as it sounds like multiple issues that are electrical in nature. OR begin testing every power and ground, making sure that the grounds are free of corrosion and that they are tight. The same is true for the powers, ie, connections and terminal tensions, etc.. the UBEC is a great source for this as well as fuse box where a connection becomes loose over time can create intermittant connections that when jarred can create a spark or arching and this can be the cource of your ticking at one or more relays... this begs further information and much deeper digging.

New User

Apr 24, 2009, 3:01 AM

Post #4 of 7 (7275 views)
  post locked   Re: '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

HI there, thanks so much for your response.

I am almost given up on the car at this point. I told my friend about the codes I pulled off the scanner and he said none of those should cause the battery to be drained when the ignition is not even in the car. Someone at the auto store told me I may need to "run the wires" and that "it is an easy job" that I can "do myself" but "it takes about 5 - 6 hours", which I do not see happening. I have a repair manual for my car and the procedure to test and replace those two sensors seems pretty straightforward, but again this seems like there are more issues going on, which I am not surprised to hear.

Well I appreciate your response though and I will keep you updated.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 24, 2009, 4:25 AM

Post #5 of 7 (7271 views)
  post locked   Re: '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

None of those codes would have any bearing on parasitic battery draw.

There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

New User

Nov 5, 2010, 11:32 PM

Post #6 of 7 (6603 views)
  post locked   Re: '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

Hello, I have just experienced the same issues with my '99 GA 3.4... dead batt., trunk pops open when trying to start... Was there a solution to this issue?

(This post was edited by chillersjb on Nov 5, 2010, 11:35 PM)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 6, 2010, 5:40 AM

Post #7 of 7 (6598 views)
  post locked   Re: '99 Grand Am GT battery drainage, nothing on, codes P0122, P0452, P1635  

This thread is well over a year old. If you have a question, please just start a new question of your own.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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