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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
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I HAVE A 2007 CADILLAC STS V6 ...THE CHECK ENGINE LIGHT HAS

Customer Question

I HAVE A 2007 CADILLAC STS V6 ...THE CHECK ENGINE LIGHT HAS BEEN ON FOR A WHILE BUT JUST NOW CARRIED IT TO THE DEALER TO CHECK OUT...CODEPO531THRU PO536 CAME UP INDICATING ALL SIX COILS WERE BAD ...ALLCOILS HAD BEEN REPLACED ABOUT 18 MONTHS AGO...DEALER SAID ECM WAS BAD ...REPLACED ECM...SAME CODES STILL COME UP AND ENGINE LIGHT STILL ON. WHAT NEXT ?
Submitted: 4 months ago.
Category: Cadillac
Expert:  Ryan Schott replied 4 months ago.

p0531 32 and 33 are A/C pressure switch codes not ignition coils are you sure those were the codes.

Customer: replied 4 months ago.
sorry I wrote wrong #....p0351,po352,po353 po354,po355,po356
Expert:  Ryan Schott replied 4 months ago.

the vehicle runs though correct?

Expert:  Ryan Schott replied 4 months ago.

i would start by checking ground 109 and ground 112, in picture 1 its the number one, in picture 2 its number 2. the first picture is of the rear of the back cylinder head, the second one is near the starter.

Customer: replied 4 months ago.
checked the grounds...they appear intact and not loose...should I check more?
Expert:  Ryan Schott replied 4 months ago.

its worth removing and cleaning them then, clear codes and see if they reset, if so we will need to test hz at the coils.

Customer: replied 4 months ago.
ok ..let me try that
Customer: replied 4 months ago.
that cleaning only kept light off for a while;;;;;so what is the next step
Expert:  Ryan Schott replied 4 months ago.

do you have a multimeter?

Customer: replied 4 months ago.
Expert:  Ryan Schott replied 4 months ago.

does it have Hertz scale on it

Customer: replied 4 months ago.
it does
Customer: replied 4 months ago.
what is next step

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