tire pressure sensor on 01

I would try a retrain on them before I did anything else. I used a magnet from Lowe's for $4 and it worked fine. What is your weather like, has the temperature dropped?

Magnet method: With the key on, engine off, press both the lock and unlock buttons on the key fob. A horn chirp within 10 seconds indicates the TPMS receiver is in the programming mode. Place the magnet over the left front valve stem until the horn chirps. This forces the LF pressure sensor to transmit its code to the main module. Repeat the same procedure for the right front, right rear and left rear sensors in this order. Verify all four pressure readings are displayed on the driver information center.

or... the main item you need to re-calibrate (actually

it's "program the sensors" in the service manual lingo) the sensors is a

magnet to engage sensors during the training sequence. The GM tool is J

41760, but maybe a decent powered magnet with a horseshoe shape or hole in

it would suffice???

Make sure vehicle has been stationary for at least 2 minutes.

1 - Ignition on

2 - Press RESET to clear all IPC messages from DIC

3 - Press and release OPTIONS, scroll til IPC is blank

4 - Press and hold DIC RESET for 3 seconds

5 - Press OPTIONS again until TIRE TRAINING message is displayed

6 - Press RESET until IPC LEARN L FRONT TIRE to begin programming

7 - Install J 41760 over left front valve stem (I guess you could try a

hefty magnet now)

8 - The horn will sound indicating LF sensor is programmed

Notice - if after 15 seconds the horn doesn't sound, remove and reinstall

tool on stem. This may have to be done up to three times in some instances.

9 - IPC will direct you to LEARN R FRONT TIRE, R REAR TIRE, then L REAR

TIRE.

Programming Cancellation:

1. Programming mode will cancel if any of the following conditions are met:

- program mode exited through DIC

- ignition turned off

- all four sensors programmed

- TPM program mode for 2 minutes with no sensors learned

1. If cancelled with less than 4 codes stored, the receiver will only accept

the codes programmed up to that point.

There you have it, good luck.

For '97-00: sensor PN 10438853, $126.25 each; retaining nut PN 10268439, $1.88 each; and O-ring washer PN 10268438, $1.88 each. These are the same for all four wheels. In 2001, GM went to an FM bandwidth sensor, with the following part numbers: sensor with O-ring PN 2571358, $80; and retaining nut PN 25708165, $3.68.

kickstart

Did you get a drop in temperature down there? You can lose about a pound for every 10 degrees it drops. If they were a little low in the first place it will trigger the check TPMS codes. Another way to get them back on track is to let out all of the air when the tires are warm and move it a bit to get the zero readings and then put back the proper amount. How's your fob batteries? Part of the link and may be needing some fresh ones.

I have a similar problem on a '99 and the message is Service Tire Pressure Monitoring System Soon. The error codes say it is loss of communication with the left front. I had the sensor replaced and get the same results.

What is this about the FOB battery being related to tire pressure monitoring? Never heard of that before. I do know that the range of the FOB is crappy and sometimes I need to be standing right next to the Left side of the car.

The FOB is a triggering signal for the setting of the training mode and can influence an error. As for the antenna being the problem, sure, it's part of the system but why only the left front? I think the controller is the same but the antenna are separate and I no longer have the manual to check that. Is your battery up to snuff in the FOB? Have you put on new tires? Do they have steel wire side walls? New brake hoses that are steel braided? Has something changed that could interrupt the signal from the sensor rather than the signal not being sent? To really get picky does the new and or the old sensor have the same valve core and cap as the other sensors, or have they been changed?

Hi Dad,

Thanks for answering.

Is your battery up to snuff in the FOB? I'll replace it, but when I try to train the pressure sensors using the dash control, I can't get the LF to train and since that is the first one, I can't get to the others.

Have you put on new tires? Yes, but they are the same type as the old and the problem showed up about half way through the life of the other set.

Do they have steel wire side walls? No

New brake hoses that are steel braided? No

Has something changed that could interrupt the signal from the sensor rather than the signal not being sent? No.

To really get picky does the new and or the old sensor have the same valve core and cap as the other sensors, or have they been changed? Same valve caps on all valve stems. I could move the left one to the right and the right to the left and try to train. Can't say about the valve core, but when the problem started, nothing had changed. After the problem first showed up, I had my Chevy dealer check in to it and he said that testing showed that the sensor needed replacing for about $275. I had him order it but while waiting for it to come in, the error went away and staid for several months now it is back and won't go away. I had the tire dealer replace the sensor when he put new tires on but that didn't fix it. They are the same people who put the last set of tires on and they know how to train the sensors and like I said, I got through about 1/2 the life of the other tires before the problem showed up.

I appreciate your suggestions.

Take a good look inside the wheel well and the sensors and cables and then compare them to the right side. Something is maybe loose of bent just enough to keep a clear signal from being transmitted. Could be just heavy dirt or road tar that has disrupted the path. Then there is always the loose or corroded connection that will drive you nuts trying to find where it is hiding.

It has been a long time since I read about the core and cap being an issue and since then I've changed some sensors the have differing cores and it didn't seem to affect the readings. Just a shot in the dark as to what it might be.

Although I believe it refered to training the vehicle to a new FOB, there was a note several years ago to do training at a good distance from other GM cars/trucks with similar security or body control modules.

Might someone you leant you car to use that pucture sealent in a can? That's a sure way to lose a sensor.

I went through all the steps with the magnet, worked fine Thanks for all the help

Kickstart