Yes. There can still be codes even though the check engine light is not on. Most codes will trigger the check engine light but there are others such as voltage issue codes like this that would not turn it on.
As for the RPMs being high could be normal but I think that supports this as the PCM will raise the RPM when it sees the voltage is too low.
So I suspect we have a PCM issue but let's start with codes and go from there. Thanks
Saturday, February 13th, 2021 AT 4:21 PM