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Old 09-14-2019, 07:20 PM #1
Oregon1 Oregon1 is offline
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Fading check engine light

2018 Limited - 22K miles

Washed, drove all morning on errands, went to start it later and it wouldn't turn over. All the lights etc were fine. Tried a few times - ended up pulling the batter cables and let it sit, attached back - started up with no issues.

Drove to Home Depot - turned it off and the check engine light started to fade in and out. Never full glow - like a dimming light bulb but not consistent - erratic. Got out - it beeped at me - pressed the lock on the key fob - nothing. Opened the door - no chime. Got in and it started right up - no check engine lights.

Drove to grocery store - turned off - light went glowing again - no door chime - but this time it locked when I pressed the key fob on exit. Came back - nothing. Wouldn't unlock. Pulled the cheat key from the fob, got in, and started up. No lights. Thought hey maybe its the fob - tried the other..same result. Glowing barely noticeable check engine for about 5 minutes after its shut off - then the door starts to chime. But now the fobs not locking or unlocking. When I walk away it beeps three times and inside its flashing the missing key symbol.

Pulled to see a code and only P0504. Why would it only dimly glow for a bit with the engine off - but clear as a bell and runs fine when on...

Go....

Edit - And I just went out with no key near it - and after an hour - the check engine iight is still half on.

Battery? Evap?

Last edited by Oregon1; 09-14-2019 at 08:24 PM.
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Old 09-14-2019, 08:51 PM #2
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Maybe something got wet during the wash?
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Old 09-14-2019, 09:07 PM #3
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Donít think so. Didnít open the hood and I drove it for an hour after. As a note I did go out a few minutes ago. The light was off and the fob worked again.
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Old 09-15-2019, 07:11 AM #4
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Did u get gas while u were out? no idea what the code means but try ur gas cap maybe loose or off. Wife does this alot!!
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Old 09-15-2019, 10:37 AM #5
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Quote:
Originally Posted by Oregon1 View Post
Donít think so. Didnít open the hood and I drove it for an hour after. As a note I did go out a few minutes ago. The light was off and the fob worked again.
Has it self-resolved then, you think?
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Old 09-15-2019, 01:33 PM #6
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Quote:
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Has it self-resolved then, you think?
Oddly this morning itís fine. I did remove the pedal commander while it was going on but it lit the same light for a few hours after it was removed so not sure if related or not. Although I suspect anything I plug in can screw something up. Iíll keep an eye on it.
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Old 09-15-2019, 01:34 PM #7
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Quote:
Originally Posted by NoLight View Post
Did u get gas while u were out? no idea what the code means but try ur gas cap maybe loose or off. Wife does this alot!!
No but in Oregon weíre not allowed to pump our own gas so any other time thatís a possibility for sure.
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