YukonXLMan
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- Joined
- May 21, 2019
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In running my vehicle down from NE to FLA last weekend, I got a blinking check engine light. Initial diagnosis was P0300 (of which much has been written of in this forum). I believed it to be from poor gasoline. After using a few fuel additives and the highest octane fuel I could find on the way back, I no longer have a blinking check engine light, but I continue to get P0300 and P10E4 error codes each time I clear them, restart the engine, shut engine off and recheck for codes. The P10E4 error code reads "Ignition on/start circuit source bypass relay control performance."I look up the error code on autocodes.com and it recommends checking a valvetronic relay supply voltage. I must admit, I cannot find a fuse or relay on my 2017 Yukon XL that matches that name.
Any recommendations on how to begin debugging this?
In running my vehicle down from NE to FLA last weekend, I got a blinking check engine light. Initial diagnosis was P0300 (of which much has been written of in this forum). I believed it to be from poor gasoline. After using a few fuel additives and the highest octane fuel I could find on the way back, I no longer have a blinking check engine light, but I continue to get P0300 and P10E4 error codes each time I clear them, restart the engine, shut engine off and recheck for codes. The P10E4 error code reads "Ignition on/start circuit source bypass relay control performance."I look up the error code on autocodes.com and it recommends checking a valvetronic relay supply voltage. I must admit, I cannot find a fuse or relay on my 2017 Yukon XL that matches that name.
Any recommendations on how to begin debugging this?