SOLVED: TPMS won't stay learned?

[KidWgn]

2012 Tahoe LTZ

New Schrader 33560 TPMS sensors

All remotes work perfectly and do not lose sync, so I don't think it's a problem with the RDL module.

I can succesfully program the TPMS sensors, and view pressures on the DIC.

As soon as I turn the truck off and back on, I get "--" on each tire again.

I'm losing my marbles here. Are the sensors faulty? Were they programmed incorrectly?

EDIT/SOLUTION: Turns out the RCDLR had somehow lost its memory. I used my bi-directional Launch scanner to rewrite the tire type as P-metric, and the suggested pressure as 36psi, and everything works fine now.

 

[bill1013]

What relearn tool are you using and are you following the instructions? This relearn tool is what I use. I got it on Amazon for $13. Good luck!

 

[swathdiver]

Put a scan tool on the truck and look for any BCM or Chassis codes. Any other vehicles nearby with TPM sensors?

 

[KidWgn]

What relearn tool are you using and are you following the instructions? This relearn tool is what I use. I got it on Amazon for $13. Good luck!

That very same tool, actually! It learns the sensors fine; once I shut the truck off, it forgets them.

Put a scan tool on the truck and look for any BCM or Chassis codes. Any other vehicles nearby with TPM sensors?

That's tonight's project. My scanner was dead and needed updates yesterday.

The sensors are Schrader's multi-frequency sensors, and I'm wondering if they didn't program them correctly. If that's the case, though, wouldn't they not display AT ALL?

I hate stupid mysteries like this. I wish I had a known good set of TPMS sensors to test on the truck.

 

[swathdiver]

That very same tool, actually! It learns the sensors fine; once I shut the truck off, it forgets them.

That's tonight's project. My scanner was dead and needed updates yesterday.

The sensors are Schrader's multi-frequency sensors, and I'm wondering if they didn't program them correctly. If that's the case, though, wouldn't they not display AT ALL?

I hate stupid mysteries like this. I wish I had a known good set of TPMS sensors to test on the truck.

This is why I do my best to stay away from aftermarket parts.

 

[KidWgn]

This is why I do my best to stay away from aftermarket parts.

Schrader is the OEM for the tire sensors.

 

[swathdiver]

Schrader is the OEM for the tire sensors.

Schrader is an OEM supplier but those are not OEM sensors. Big difference.

For example, Delphi is an OE supplier for oxygen sensors. However, the Delphi sensor and GM sensor made by Delphi are different and often don't work the same as they are different. They look different and the computer sees the information they provide differently, often being unable to accurately calculate the alcohol content of the fuel.

 

[KidWgn]

Schrader is an OEM supplier but those are not OEM sensors. Big difference.

For example, Delphi is an OE supplier for oxygen sensors. However, the Delphi sensor and GM sensor made by Delphi are different and often don't work the same as they are different. They look different and the computer sees the information they provide differently, often being unable to accurately calculate the alcohol content of the fuel.

That's fair.

The Schrader valves I used are their "new and improved!"

Now I'm wishing I had just bought the OEM 21507 sensors.

And of course, I bought the sensors like a year ago, and just now got around to installing them, so I can't even return the $100 worth of sensors. Oh well.

 

[OR VietVet]

The multi-frequency sensor is called a T10 sensor, if that info helps at all. Operates between 315 mhz to 455 mhz....I think.

 

[swathdiver]

That's fair.

The Schrader valves I used are their "new and improved!"

Now I'm wishing I had just bought the OEM 21507 sensors.

And of course, I bought the sensors like a year ago, and just now got around to installing them, so I can't even return the $100 worth of sensors. Oh well.

Set of 4 PCS OEM 13540600 TPMS Tire Pressure Sensor for Buick Cadillac Chevrolet | eBay

4pcs Sets GM Genuine Parts 13540600- Tire Pressure Monitoring (TPMS) Sensor. Part Number: 13540600. 2008-2009 Buick Allure. 2009-2017 Buick Enclave. 2008-2009 Buick LaCrosse. 2007-2011 Buick Lucerne. 2008-2014 Cadillac CTS.

www.ebay.com

I bought GM OE sensors from this guy in November last year. $48.25 delivered for all 4. Work as they should.