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CHEVY 2009 HHR 2.0L TURBO SS. THROWING CEL CODES

Customer Question
CHEVY 2009 HHR 2.0L...

CHEVY 2009 HHR 2.0L TURBO SS. THROWING CEL CODES P0300,P0301,P0302,P0303 AND P0304 (CYINDER MISFIRES). CAR RUNS GOOD. NO PERCEPTABLE "MISSING" OF ENGINE WHILE DRIVING. SPARK PLUGS CHANGED AND COILS CHECK OK.

Mechanic's Assistant: Does the light stay on, or does it blink?

TYPICALLY STAYS ON. ONLY BLINKED ONE TIME BREIFLY AND RESET.

Mechanic's Assistant: What year is your Turbo?

2009

Mechanic's Assistant: Are you fixing your Turbo yourself? What have you tried so far?

JUST TRIED THE SIMPLE AND OBVIOUS. CHANGED PLUGS (GM OEM) AND TESTED COILS (THEY WERE OK).

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

NO, I DON'T THINK SO...

Submitted: 10 months ago.Category: Chevy
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Answered in 22 minutes by:
9/23/2017
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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What kind of work was done on the car prior to this issue with the check engine light and misfire codes? Engine replacement? Computer replacement?

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Customer reply replied 10 months ago
Recent purchase, dont know much history. Car has low miles 55k.
Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago

Sorry for the long delay, I got pulled away from my computer yesterday and didn't make it back. The reason I asked about what kind of work was done is because of the trouble codes, false misfire codes will usually come after an engine or computer replacement, if the correct procedure isn't followed. The procedure is a scan tool function called "crankshaft variation relearn." When this is performed, the computer learns the minor differences in machining, etc. that will allow it to accurately count misfire events. If your computer is counting misfires based on what it learned from a different engine, that would explain your problem. I would perform this procedure regardless, as it might just solve the problem for you without any further effort.

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Chevy Mechanic: Jerry Newton, Chevy Technician replied 10 months ago

Did you get this worked out?

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