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Service ESP

Kandhol

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Hi, i know this thread been asked so many times and i read all of them but cant find the answer. I have a 2015 wn caprice v 6.0L my car starts fine no problem at all but after 1-2 mins when idle settles "Service ESP" sign come on dash and car start shaking and this only happens on cold start but when sign is there i press on gas sign goes away. 5 months ago i changed oil pump and sensor, cam, lifters and changed spark plugs, injectors, coils, new air filter everything.i put a scan tool p0300 and p0521 these 2 codes coming up. Thanks in advance
 

lmoengnr

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Might be a dud injector...
 

Kandhol

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Same thing mechanic told me maybe injectors not good, so i get them changed.
 
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