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My 2009 TL went from 40mph and dropped to about 15mph and the check engine light was flashing. I pulled over and it was jerking a little while in park so I turned it off and let it sit and after turning it back on the light was gone and no jerking at all. I try to use a code scanner but nothing came up since the light went off. Is there anyone that might know what’s going on?
 

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I had a similar issue in my 08 RDX a while back (X-mas lights in the dash, jerking, and wouldn't start until a jump or sat for a while). Turned out to be the alternator slowly going out. The alternator wasn't putting out enough voltage/power to run the RDX and recharge the battery. The RDX was stealing power from the battery to make up the difference until the battery ran too low (start the lights and jerking). Recharging the battery can give you enough time to drive to repair shop instead of having it towed. I think I did Firestone for around $450 compared to Acura that wanted +$700.
 

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I had a similar issue in my 08 RDX a while back (X-mas lights in the dash, jerking, and wouldn't start until a jump or sat for a while). Turned out to be the alternator slowly going out. The alternator wasn't putting out enough voltage/power to run the RDX and recharge the battery. The RDX was stealing power from the battery to make up the difference until the battery ran too low (start the lights and jerking). Recharging the battery can give you enough time to drive to repair shop instead of having it towed. I think I did Firestone for around $450 compared to Acura that wanted +$700.
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The only other problem I had with my 08 RDX when the alternator slowly died was it damaged my battery being drained of power so much. My battery was already +5 years old and the alternator issue put a few more nails in the coffin sooner. Ended up having the same issue with my 06 TSX later and I changed out the alternator sooner compared to self troubleshooting, jump starting, and back/forth to the dealership for weeks.
 

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My 2009 TL went from 40mph and dropped to about 15mph and the check engine light was flashing. I pulled over and it was jerking a little while in park so I turned it off and let it sit and after turning it back on the light was gone and no jerking at all. I try to use a code scanner but nothing came up since the light went off. Is there anyone that might know what’s going on?
The check engine light flashes when the engine has a hard misfire. This definitely would set a durable code identifying which cylinder was missing. Other codes that would help you suss out root causes should also exist.

I think you did not correctly read the codes, or perhaps you inadvertently erased them
I suggest you take it to someone who is experienced. Driving with hard misfires can in short time destroy your engine.
 
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