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Two codes on Pcm/ Service Lamp on


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Service lamp just came on, I had repalced the starter 2-weeks ago the alternator 3 weeks ago and steering rack last week.

I think the starter replacment may have disturbed something!

Code 0171 Fuel Trim Lean Bank One.

Code 0174 Fuel Trim Lean Bank two.

Also Ipc B1552

What and where should I be looking for this problem?

Thanks in advance.

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Your P0171/0174 codes point directly at a vacuum leak. And your assessment of the starter replacement as a contributing factor is right on target.

The B1552 is a keep alive memory error and is not worth worrying over for now.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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I agree with Jim, your intake is not seated fully or the seal is damaged allowing unmetered air into the intake system, it should be removed as soon as possible in case its not on correctly or cocked so that it does not crack, inspect the intake seals for damage and intake manifold for cracks

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I have checked all the hoses, oil stick and other related vacuum connections and they look good. Would it be advantages to replace the intake gasket or just look for a seating issue. My wife drove the car for a few days before this issue came up. As a note the intake was off two times the started tested good at discount auto but it was intermittent and I replaced it and problem was resolved.

I am thinking a little brake cleaner might narrow down the spot any feedback on this? Also why would 1 &2 banks just show, would it narrow down the location of the leak or does it matter.

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We can not see where your problem is, we cant tell if the seal is cracked, the lip damaged, or if the intake is not seated, or if its not torqued down properly, that can only be determined upon inspection. that is what I was trying to say in my post above

You are correct to check for damaged or disconnected hoses, as you are looking for a leak that is affecting BOTH banks, the front and the rear banks equally, that is why you are getting two codes (bank 1 and bank 2)

the brake cleaner may find the leak, but you are going to need to remove the intake to repair it unless you find a vacuum leak like the brake booster line, EGR line, etc

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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89 inch pounds equates to 7.416 foot pounds (89/12)

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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