03 cts trouble codes
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 03 cts trouble codes in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Have an 03 cts that is throwing p0171,300,301,302,303,305 codes. I have replaced Maf sensor due to having p171,174 the past ...
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    arogers260's Avatar
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    03 cts trouble codes

    Have an 03 cts that is throwing p0171,300,301,302,303,305 codes. I have replaced Maf sensor due to having p171,174 the past month off and on now just getting 171. The Maf sensor has been replaced twice this past month thinking I had a defective one, had smoke test, and fuel pressure test done too. None seem to be the problem and no shop can find a problem so they say. Just got the misfire codes today can someone help me out I'm getting frustrated at this problem.

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    san2cci's Avatar
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    Re: 03 cts trouble codes

    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
    Fuel Trim System Lean Conditions
    Bank 1
    No PCM codes set, ECT input from 176-230°F, engine speed 1000-4000 rpm (0-4000 rpm on VIN 1), throttle angle steady below 91%, VSS under 70 mph, purge duty cycle below 80%, then the PCM detected that the LONGFT was over 100, or that the SHRTFT was below 94, either condition met for over 25 seconds

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    san2cci's Avatar
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    Re: 03 cts trouble codes

    That's all I can find on P0171

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    I honestly think I'm having ECM PCM problems cause the system riding lean keeps showing up after new Maf sensor on and the vehicle passed both smoke test and fuel pressure test as being correct.

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    san2cci's Avatar
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    Re: 03 cts trouble codes

    When I had a Fuel Trim System Lean Conditions on bank 2, it was because I had a hole in my exhaust right by my resinator...but I doubt that's your problem. Have you brought the car to a GM dealer?

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    CTSUK's Avatar
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    Re: 03 cts trouble codes

    Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust).
    Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.

    This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.

    More can be read here:
    http://www.obd-codes.com/p0171

    Worth checking your air filter if you haven't already

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    arogers260's Avatar
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    I just put brand new air filter on new Maf sensor had fuel injectors cleaned and throttle body. Haven't made it to my local Cadillac the light just came back on today and they r closed on weekends. My main concern right now is to y I'm having 5/6 cylinders misfiring with the p0300-305 the only one not present is p304. I spoke with a Cadillac dealer technician about the p0171 code and what I've done and he said its highly possible that my throttle body wiring is bad. But that's just an assumption based off the info given over the phone. The misfire codes just showed up today but it seems to run just fine no hesitation, lag in acceleration none of that just codes

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    Re: 03 cts trouble codes

    update....i disconnected my battery and since reconnecting so far no CEL but we shall see if it decides to come back up and which codes i get this time.

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    Calvin_Z is offline Cadillac Owners Member
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    Re: 03 cts trouble codes

    Did that solve your problem?

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    No it didn't unfortunately I still have p0171 and p0174. The misfire codes went away after I put new spark plugs in.

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    I plan to do the Pcv upgrade and new valve cover due to to oil leaking into the spark plug wells but won't have time for a week or so.

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    So I recently found that my air box wasn't put back together right by a local shop that did my smoke test. The bottom wasn't sealed so that could be part of my problem and also coming to the dealership I was told that the oil leaking into my spark plug well could cause me to be riding lean on one of my banks not the other tho. More to update later when problem is finally solved completely.

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    Replaced o2 sensors code popped right back on shortly after tho.

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    Re: 03 cts trouble codes

    Which sensors did you replace? and whered you get your sensors?

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    Bosch oe fit downstreams

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