I have a 2018 Highlander with a check engine light on. No rough idle, runs smooth but it turns off every so often when I come to a stop on the road and the charging system message comes on the dash. Hope someone can help. Thanks in advance.
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Quickest and easiest way to find out what the problem is, is to get the vehicle's OBDII port scanned with an appropriate scantool to check what DTC (diagnostic troubleshooting) codes have been logged by the ECM (engine control module).
The code will tell you what the problem is. If you click on the DTC link above and check if the code is listed there (or search online for the code if it is not listed in the link) you should find what the most likely reason is for it to occur.
If you're in the USA, major auto parts retail stores e.g. AutoZone, PepBoys, O'Reilley's etc will do this for free apparently.
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