I have 36K miles on my 04 and I was replacing the original tires with Michelin run flats (much quieter BTW). The tire pree monitoring sys was working fine but I decided to replace the sensors. I got new sensors from GMpartshouse.com and the tires from Tirerack. The local installer couldn't get the sensors to communicate with the car. The sensors are sending a signal but I get xxx for each tire on the DIC. I took the car to a Chevy dealer and they used their scanners etc and were not able to correct the problem. They didn't charge me though. They said I need to leave the car for more investigation by a tech. I don't see any other choise. Anybody else have a problem like this?

 

Sthey are the correct sensors? 2004 should be the newer (and cheaper btw) ones. Closer to $40 each rather than $90 each for the older ones.

Did anyone do the relearn procedure, with the magnet?

Tire Pressure Sensor Learn
Tools Required
J 41760 Tire Pressure Sensor Activating Tool

TPM Learn Mode Description
The Tire Pressure Monitor (TPM) system uses the remote control door lock receiver (RCDLR), body control module (BCM), driver information center (DIC), 4 radio frequency transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after a tire pressure sensor, or RCDLR replacement. Once the learn mode has been enabled, each of the sensors unique identification (Id) codes can be learned into the RCDLR's memory. After the RCDLR has received a sensor transmission, it sends a serial data message to the BCM to sound a horn chirp. This verifies the sensor has transmitted its Id and the RCDLR has received and learned it. The RCDLR must learn each sensor's Id in the proper order to determine sensor location. The first learned Id is assigned to the left front location, the second to right front, the third to right rear, and forth to left rear.

Sensor Functions
Each sensor has am internal magnetic reed switch. When the J 41760 sensor activating tool is held close to the sensor, the reed switch closes, activating the sensor. The sensor responds to a magnetic activation by transmitting in learn mode. When the RCDLR receives a learn mode transmission while in TPM learn mode, it will assign that sensor Id to the location on the vehicle relative to the order in which it was learned.

TPM Learn Mode Cancellation
The RCDLR will cancel the TPM learn mode if the ignition is turned OFF, more than 1 minute has passed and no sensor Ids have been learned, or if more than 5 minutes have passed for the entire procedure. If the learn mode is cancelled before any sensor Ids are learned, the RCDLR will remember all previously stored Ids and their locations. As soon as the RCDLR learns the first sensor Id, all previously stored Ids are erased from the RCDLR's memory.

Turn ON the ignition, with the engine OFF.
Press the DIC RESET button in order to clear any warning messages.
Press and release the OPTIONS button until the display is blank.
Press and hold the RESET button for 3 seconds.

Important
If the DIC does not display the TIRE TRAINING message, ensure the TPM option is enabled in the RCDLR. Refer to Scan Tool Output Controls .


Press and release the OPTIONS button until TIRE TRAINING is displayed.
Press and release the RESET button and LEARN L FRONT TIRE is displayed, verifying the mode has been enabled.

Important
If a horn chirp does not sound after 15 seconds, remove then reinstall the sensor activating tool.


Starting at the left front sensor, hold the J 41760 over the valve stem until a horn chirp sounds.
After the horn chirp sounds, proceed as in step 7 for the next 3 sensors in the following order:
Right front
Right rear
Left rear
Turn the ignition OFF to exit the learn mode.

 

Just so happened that I read these info items just today. I am new to the C5, so I have no idea if these will help.
Dan


http://www.corvetteactioncenter.com/...re+Replacement

http://www.corvetteactioncenter.com/...Run+Flat+Facts

 

Thanks guys.
Jistari - The sensors were about $40 each. The tire installers told me they tried the magnet tecnique. Wouldn't the dealer have the sensor activating tool? I'm not sure exactly what they used. Each sensor is transmitting its ID number. I saw that data on the installer's device. They said the car isn't receiving it.

 

You could double check the reference numbers but if the sensors were $40 you have the correct ones for an 04. The older sensors are way more expensive.

When you program the sensors you go into programming mode as described. You start at the front left and place the magnet near the sensor. Once the sensor trains it will beep. If it doesn't beep it hasn't started the sequence so you need a bigger magnet.

I struggled with my after market wheels but I never had a problem with the stock wheels including with my Michelin AS ZPs.

I eventually got them to program using this type of magnet and even then they were playing hard to get until it clamped itself to the rotor.

 

The correct TPMS sensor for '01- '04 is GM P/N 25773946.

Make sure that's what you have.

 

Thanks for the input guys - I definitely have the correct ones - PN 25773946.
I guess I will have to let the dealer diagnose it.

 

I'd get a monster magnet first. It'll be a fraction of the cost a dealer will charge if thats the problem. Your call

 

I had the exact same problem. New sensors but no readout on the DIC. The dealer said it was the receiver that needed to be replaced and after a long process (receiver was and still is I believe on back order). a receiver was installed and then the sensors worked just fine. I'm still not sure in my own mind that it was the receiver as it was still reading the key fob ok. What you might try is to drive the car for a few weeks and then try again. I seen posts here on the forum where that seemed to have worked. Good luck and keep us posted as to what happens.

By the way, mine is an 04 also.

 

What Jistari and DeeGee says...I had one drop offline after tire replacement, and Discount Tire had me walk through the learn procedure on the DIC while he zap each one as we reset them.

You just need to run the procedure most tire places have the magnets.

 

Have you run the re-learn procedure and zapped each as they come up on the display?

 

Have you tried to program the sensors yourself?

Is your keyless remote working OK?

Have you checked the car battery? If not fully charged can sometimes cause problems programming the sensors.

 

Definitely worth a try!

 

The car battery seems to be fine. All the remote functions work fine. As for the magnet - the tire installer told me they tried the magnet along with scanners etc. I will try the magnet method myself and report back. Thanks for the help.

 

The procedure will step you through each sensor.

 

He probably has the correct sensors and he mentioned that they see them transmitting on the screen at the tire shop.

Im leaning towards (but hope it isnt) a problem with the receiver. I probably would do nothing for a bit. The advice above to use them for a while (couple of weeks) and just try and relearn them periodicaly with your own magnet seems like a good approach.

This type of problem is very similar to what you may experience when going out to dinner with your wife of thirty years if she gets up to use the lavatory and you order unsweetened Ice Tea for her (as she has ordered, every time, for as long as you can remember) but you find that when she returns, she wanted.....water

Some things in this world are beyond the ken of man . . .

 

If its the receiver its shared with the door lock system. If the fobs are working fine its not the RFA.

Loved the analogy Jistari!!

 

Did you keep your old sensors?

If you still have them, try doing the TPMS training procedure again with the old unmounted sensors.

 

I have the same problem with my 2003 where all 4 sensors started showing 'XXX' all of a sudden. My sensors were new in 2008 that came with my CCWs, and I had no difficulty using the magnet method back then (a small pick-up magnet) to activate them. Now no matter what kind of magnet I use, I cannot get the system to relearn.

I talked to a GM tech whose opinion I respect and he pointed to the receiver as the problem. And by the way, he said that the FOBs can definitely still work even if the TPMS system does not, because the TPMS operates on a different frequency.

Anyway, for what it's worth.

 

Although it's possible, I find it hard to believe that the RF receiver is bad in this case.

The OP's original sensors were still communicating with the RF receiver.
The problem surfaced only AFTER they were replaced.