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56napco

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About 56napco

  • Rank
    Enthusiast

Profile Information

  • Location
    Maquoketa, IA
  • Gender
    Male
  • Drives
    2002 GMC Yukon XL 2500, 2008 GMC Envoy Denali, 1974 Chevy K/20
  1. Envoy Denali Left Front TPMS issue

    It's been a week now and no issues since the dealer reprogrammed the tailgate module.
  2. Envoy Denali Left Front TPMS issue

    So, the reason I took it back to the dealer was because that is who I got the tires from and who mounted them. So that is why I took it back to them, so they could figure out why the TPMS light came on only after they mounted the tires. It worked fine before the tires were mounted and before they taught the sensors. I would trust the dealers around here more than a private shop. Now in Dubuque, where we work, thats a different story. The part number for this sensor is the only part number that is correct for this Envoy except export models per GM, it's a 2008 Envoy not a 2009. There is nothing aftermarket, except a K&N filter, on this truck and I have not modified it at all. Otherwise it's completely stock and it's going to stay that way. Regardless, so far the TPMS light has not come back on and the sensor is still reading tire pressure correctly. Tomorrow will be the real test when my wife takes it to work in the morning.
  3. Envoy Denali Left Front TPMS issue

    Just spoke to the service manager over the phone. They were able to get the sensor to teach but using their TPMS sensor tool, I have only taught the sensors per the procedure in the owner's manual since I don't have the sensor tool. They also started with the Right Front, which the vehicle then thinks is the left front, taught all the sensors and took it for a ride. GM told them that if after 3 miles the light comes on it will be a sensor issue, after 10 miles it is a BCM issue. Of course after 10 miles the light came on and still was saying the left front signal was lost, which is actually the right front in this case. Now, I had the BCM replaced less than two years ago for a TPMS issue which turned out being due to having LED bulbs installed for the license plate lights, so I have a tough time believing the module would have failed already and the only way to fix this is with a $400 module and labor. I am having them reprogram the existing BCM and we'll take it from there, even though they didn't like trying that. My thinking is when they first reprogrammed the sensors that the programming became corrupt since everything worked find up until a few days after the new tires were installed.
  4. Envoy Denali Left Front TPMS issue

    Well, going to give them one last try before going somewhere else. Truck goes in next Friday and I at least was able to get them to confirm the sensor part number, #25774006, over the phone and will ask to see the old sensor. I agree that the first sensor may have been damaged and worked a couple days after the tires were installed. Also, I had all four sensors replaced in 2016. We'll see how it goes this time.
  5. Envoy Denali Left Front TPMS issue

    So, if they did not replace the sensor but they somehow get it to work for a short time for me to drive home before it stops transmitting again what could the dealer be doing to make it work? They also have not given any paperwork for the second or third sensor replacements nor have they charged me anything. The issue with taking it to another dealer is the first sensor on the invoice was not a GM part, not sure if that will not be covered by another dealership or if only labor will be covered since it wasn't a GM part and they make me pay for another new sensor.
  6. Last month I had new tires installed on my 2008 Envoy Denali at my local GMC dealership, everything was good when we picked it up. Two days after the tires were installed the TPMS system showed the Left Front lost signal with just dashed lines in the DIC. Since then I've taken it back to the dealer and they have put three new sensors in the left front wheel, two aftermarket and one GM. There is a GM sensor currently installed. When the dealer gets the truck in they cannot get the TPMS to read or teach the left front, they install a new sensor and it then teaches and reads properly. This lasts for maybe day and not more than 10 miles before the dashed lines come back and it drops the left front again. I've tried teaching the sensors myself after this happens and nothing happens when I try to teach the left front. The other three wheels all read correctly and have not had issues with them so I can't believe it has anything to do with the tires causing the issue. Everything works except the left front. Is there anything left to try? I'm getting tired of taking it back to the dealership just to have the same thing happen again when I drive it home and they haven't tried re-programming the BCM. Nothing else has changed except the tires. The dealer has stood behind their work and has replaced these sensors without charge but there has to be something else causing just the left front to stop reading that they are not aware of.
  7. Last month I had new tires installed on my 2008 Envoy Denali at my local GMC dealership. Two days after the TPMS system showed the Left Front lost signal with just dashed lines. Since then I've taken it back to the dealer and they have put three new sensors in the left front wheel, two aftermarket and one GM. When they get the truck in they cannot get the TPMS to read the left front, they install a new sensor and it then reads. This lasts for maybe day and not more than 10 miles before the dashed lines come back and it drops the left front again. I've tried teaching the sensors myself after this happens and nothing happens when I try to teach the left front. The other three wheels all read correctly and have not had issues with them. Everything works except the left front. Is there anything left to try? I'm getting sick of taking it back to the dealership just to have the same thing happen again, they haven't tried programming the BCM. Nothing else has changed except the tires.
  8. Good to know, thanks. I did install the Z71 bumpers, they're actually cheaper than the standard bumpers too.
  9. I replaced both front bump stops on my 2002 Yukon XL 2500 recently since the originals rotted away and noticed the lower a-arms touch the bump stops with the truck just parked normally, no load and not off level to flex the suspension. Anyone else's do this? The shocks are new but otherwise the truck sits level and rides good.
  10. Well, found out the hole is a blind hole and went ahead and put a heli coil in and seems to be holding. Apparently I'm the only one this has ever happened to...
  11. 2002 GMC Yukon XL, 6.0L. So, today I found the rear bolt that holds the oil cooler lines to the oil pan above the oil filter is stripped out in the oil pan. Has anyone installed a heli coil or maybe put a longer bolt in? Are these holes drilled through into the pan or are they blind holes? I'd like to try and fix this without pulling the oil pan if possible.
  12. So, this past Thursday night I removed the two LED bulbs I had installed in the license plate lights. Haven't had the TPMS light come on since. After doing some further research on LED's and how the cheaper bulbs can emit radio frequencies and send feedback through the wiring harness I changed out the bulbs with regular 194's. Seems to have solved the problem.
  13. The service manager called yesterday, GM's suggestion is to replaced both front tire pressure sensors. No guarantee it will fix the problem either. So even if I only do the RF wheel sensor I would be out over $100 without knowing if it will fix this issue. Seems strange to replace both front tire pressure sensors since I can rotate the tires, when I change the oil, and re-teach the sensors and the RF still triggers the dash light to come on, even when it's a different wheel.
  14. So, I have been trying to figure this issue out over the past year. 2008 GMC Envoy Denali (short wheelbase), replaced all four TPM sensors in February 2016 with AC Delco sensors. Immediately after replacing the sensors the dash light came back on and the LF stopped reading intermittently, worse when it was colder (below 40F). The truck stays inside in a heated garage. In March, I had the LF replaced again at the dealer and the light came on again. First the tire pressure reading is shown, then after driving a bit more just dashed lines show up, then after a little farther it starts reading again. Then after doing a key cycle the light goes back off and stays off. The other wheels don't have this issue and the dealer would not diagnose it unless the TPMS light is on and the sensor reading is dashed lines. We have taken it in several times, first all they did was re-teach the sensors and then lastly replaced the LGM in April after they were able to get the DTC for the left front. After the LGM replacement there have been no TPMS lights all summer until this fall when the temps began cooling off over night in the 50's. After about 15/20 minutes of freeway driving (65-75mph) the TPMS light will come on, left front will be dashed lines on the DIC. Turn off the freeway onto a 2-lane county road (55mph) and the left front will begin reading again but the TPMS light stays on. In the afternoon, after work, ambient air temps in the 70's/80's no TPMS light at all. Lately the RF will trigger the TPMS light anytime we drive on the highway. Is the receiver module starting to have issues in the tailgate? All lift gate functions work, wiper, defrost, keyless entry, etc. I have rotated the tires a couple times since the sensors were installed and they register correctly when you go through the re-teach procedure in the owner's manual. The RF has been constantly causing the TPMS light to come on. Even after rotating tires and reteaching the sensor positions the RF continues to show only dashed lines after driving ~10 minutes on the freeway. On occasion the LF and RF stop reading. Its about 40 minutes from home to my wife's office and sometime close to her office the dash will show tire pressure again. Could an ABS sensor in the wheel bearing cause interference? The only thing I can say is consistent is the light comes on in cold weather. The TPMS light came on on our way home earlier this week. Swung into the dealership and they checked it out. They were able to get signal from all 4 wheel sensors and connected to the liftgate module and found it was transmitting all 4 signals. They said it is a serial signal and only uses 1 wire to transmit them. So, they're contacting GM to find out whats next to troubleshoot but haven't heard from them yet. Any ideas from anyone on here?
  15. This past Saturday we dropped the Envoy off at the local dealer who had replaced the BCM earlier but of course they could not repeat the issue over the weekend or yesterday. They also said the compressor will run whenever it is commanded on or to keep the truck level even without the ignition on. So we have the Envoy back and just going to deal with it until something obvious fails.
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