silverspark78 5 Posted August 8, 2018 Share Posted August 8, 2018 When I took my car in for maintenance work (17 spark lt cvt) they performed a recall 18089 which has some kind of programming I guess with the cvt. Ever since then the mpg average had gone gm down by maybe 5 or 6 from what I'm used to in the city. Would this update cause it. Would disconnecting and reconnecting the battery cause this. How long till it goes back to normal? Link to post Share on other sites
Fire Spark 13 Posted August 9, 2018 Share Posted August 9, 2018 Do you notice it revving up higher when (casually) accelerating than what it did before you had the recall done? The ECM may have to "relearn" the most efficient CVT ratio at a given engine load and rpm. If it doesn't get better in the next couple tanks of gas I would take it back and complain. They may have to reflash the ECM. Link to post Share on other sites
silverspark78 5 Posted August 9, 2018 Author Share Posted August 9, 2018 It seems to not have as much power as before like I need to give it more gas. Yes I know this car isn't really powerful to begin with but still. I'm taking a 1000 mile trip from Central Illinois to the Florida pan handle so hopefully it'll relearn the cvt by then. Idk. Link to post Share on other sites
Bobby MSME 100 Posted August 13, 2018 Share Posted August 13, 2018 On 8/8/2018 at 4:47 PM, silverspark78 said: When I took my car in for maintenance work (17 spark lt cvt) they performed a recall 18089 which has some kind of programming I guess with the cvt. Ever since then the mpg average had gone gm down by maybe 5 or 6 from what I'm used to in the city. Would this update cause it. Would disconnecting and reconnecting the battery cause this. How long till it goes back to normal? Read more about recall 18089 at this link: https://gm.oemdtc.com/8853/18089-service-update-tcm-obd-memory-diagnostic-2016-2018-chevrolet-spark Link to post Share on other sites
Bobby MSME 100 Posted August 13, 2018 Share Posted August 13, 2018 Service Procedure Note: Carefully read and follow the instructions below. Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur. Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. When required install the EL-49642 SPS Programming Support Tool to maintain system voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger. Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc. Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO. If the Same Calibration/Software Warning is noted on the SPS Controller screen, do NOT attempt to program the module. No further action is required. Refer to the Warranty section of the bulletin and use labor operation code 9102966, Module Programming Not Required. Important: Before beginning the programming event, be sure the computer is connected to the MDI/MDI2 through a USB cable. DO NOT DOWNLOAD the files wirelessly or via Bluetooth connection. Reprogram the Transmission Control Module (TCM). Refer to Transmission Control Module Programming and Setup MR8 in SI. The Transmission Fast Learn procedure is REQUIRED with this programming. If there is a pop-up in SPS indicating otherwise, ignore it and proceed with the Transmission Fast Learn as SI recommends. Record SPS Warranty Claim Code on job card for warranty transaction submission. Link to post Share on other sites
Bobby MSME 100 Posted August 13, 2018 Share Posted August 13, 2018 There are a lot of steps for the technician to follow. These techs are known to make mistakes. If your Spark keeps giving you lower MPG (4-5 less is horribly bad) I would take it back to the dealer and complain vociferously. Link to post Share on other sites
silverspark78 5 Posted August 18, 2018 Author Share Posted August 18, 2018 Well actually yesterday came home from a 980 or so mile trip home from Panama city Florida to Central Illinois (Peoria) consistently getting 38-39 mpg on fill ups so I'm not really too worried there. Link to post Share on other sites
silverspark78 5 Posted August 18, 2018 Author Share Posted August 18, 2018 That brings me up on another issue though. While I was driving especially through hills the engine would rev high like 3500 to 4000 rpms to get it up to and keep it at the highway speed. Is this going to hurt the engine at all like blow it up or anything? It has synthetic oil at proper weight 5w20 and filled to proper level. Just curious. Thanks. Link to post Share on other sites
Fire Spark 13 Posted August 20, 2018 Share Posted August 20, 2018 If there was any threat of engine damage at 4000 rpm the engineers would have put the redline on the tach there instead of at 2200 rpm higher. Stop worrying. Link to post Share on other sites
silverspark78 5 Posted August 20, 2018 Author Share Posted August 20, 2018 Lol 30 minutes ago, Fire Spark said: Thanks Link to post Share on other sites
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