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mistermcgoo

By mistermcgoo
in Troubleshooting & Recalls

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mistermcgoo Enthusiast

mistermcgoo

Posted
Posted

I just installed a pedal commander and unfortunately it ended up dropping my truck into low power mode and the check engine light came on last night. Which is a common issue with pedal commanders from what I understand..

 

I just unplugged it, plugged the OEM throttle harness wiring back in and restarted the truck, which solved the low power mode issue. However, the check engine light remained on. So I went ahead and ordered a OBD II scan tool to clear the error code. Funny thing is though, I went and started my truck this morning the check engine light was gone.

 

 I was under the impression that the only way to turn the check engine light off and clear the code is to use a scan tool? Can warning lights clear themselves?

davester Senior Enthusiast

davester

Posted
Posted

Nope, while error codes will remain as "history codes", so you can read them later with a scan tool, the computers will keep checking, and if the problem is fixed/no longer happens, the code stops being current, and if it also resulted in the CEL being turned on, the CEL will go off.

 

Depending on what the problem was, how quickly the light will go off after fixing the problem will vary, sometimes right away (if say, you left the MAF sensor unplugged and you plugged it back in), sometimes it will take a number of ignition cycles to go away, or sometimes it takes a specific set of driving conditions to re-run the test and then the light will go away.

 

Also, you're vehicle will generate codes without turning on the CEL, if the problem is not emissions-related, so it's a good idea to periodically scan for codes.  And the basic code readers will only read codes from the ECM, or perhaps a couple others (commonly the TCM, ABS and/or SRS[air bags] computers), but there's 10+ more in your truck...

It's Tim Senior Enthusiast

It's Tim

Posted
Posted
On 11/29/2019 at 5:54 PM, mistermcgoo said:

I just installed a pedal commander and unfortunately it ended up dropping my truck into low power mode and the check engine light came on last night. 

I wouldn't sweat it, that stored history probably won't affect your power train warranty.

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