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twistedlizard72 12-01-2011 12:02 PM

P code after superchpsi tune
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I installed the 87 tune from my superchips tuner last night (first time) and got a P code this morning. Code is P1129; closed loop fueling not achieved, bank 2. What does this mean and should I be concerned?

sk1er18 12-01-2011 12:08 PM

When I had mine programmed with the superchips i was getting P1128 and P1129 codes consistently. I went through all of the troubleshooting steps and couldn't find a root cause. Since I'm still under warranty I put my stock tune back in so I could let the dealer have a shot at it..... the code hasn't been back since (knock on wood).

Now I Just use the programmer for tire size adjustments.... honestly didn't have a huge effect on performance anyways (I'm very subjective and not easily influenced by the butt dyno)

06WKHEMI 12-01-2011 12:08 PM


Originally Posted by twistedlizard72
I installed the 87 tune from my superchips tuner last night (first time) and got a P code this morning. Code is P1129; closed loop fueling not achieved, bank 2. What does this mean and should I be concerned?

I don't know from experience but try setting it back to stock clearing the code and starting over

mrtosh 12-01-2011 12:47 PM

May want to post on the Superchips forum. I remember seeing this code popup there before i believe. Think it might actually say sonething about that code in the Flashpaq's owners manual

sk1er18 12-01-2011 01:22 PM

Neither P1128 or P1129 was posted in any thread on the superchips forum when I searched. They're not listed in my user manual either.

mrtosh 12-01-2011 01:51 PM

I would do like 06wkhemi said and reset it to stock and reload the tune. Also you can reset the pcm by grounding out the positive cable for 30 seconds. Have you switched fuels lately? There's a TSB for hose codes when you use fuel with 38-40% ethanol which with winter fuel can happen.

TSB for 2007 GC: FLASH: MIL Illumination Due To DTC P1128, P1129 When Vehicle Is Operated With A 38% To 40% Ethanol Fuel Blend

As for the codes being talked about I'll check my manual tonight. I know they make mention of it somewhere.

paroxysym 12-01-2011 01:53 PM

id clear the codes with the tuner and set her back to stock. then try reloading it.

mrtosh 12-01-2011 01:59 PM

Just found my manual. On page 19 it mentions a P1000 code. My bad.

90grandoneer 12-01-2011 02:56 PM

I agree that you should go back to stock, clear the codes, start it and see if the codes come back. If they do, you could be having issues with your 1/1 and 1/2 O2 sensors.

How many miles on your rig? Have the O2 sensors ever been changed? These codes mean that the fuel management system has failed to switch to closed loop (status 2) after initial startup. On initial startup the system is in open loop (status 1) and should transition to closed loop within ~40 seconds. If it doesn't, it triggers these codes and status 8, which means closed loop was not achieved in a timely manner. I can't imagine the tune causing this though. I've run that tune on my Hemi without issue, but then again, I have fairly new O2 sensors all the way around. You may want to read the thread I did on the O2 sensors after I got the same codes:

Let us know what you find.

twistedlizard72 12-01-2011 03:28 PM

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I got a 2007 with the 4.7L and nearing 98,000 miles. As far as I know the O2 sensors are stock. I have never had any code before with the vehicle and the reason why I am putting it on the tune. It did throw it after initial start up this morning. I cleared the code on my lunch break today, I will see what it does on the way home. I will also post on Superchips forum.

mrtosh 12-01-2011 03:31 PM

Keep us posted. Curious on the outcome.

90grandoneer 12-01-2011 03:37 PM

Sensors should be changed no later than ~100K. They deteriorate over time (like spark plugs), and you may not notice a problem until they get real bad, or fail outright. What causes those codes is that the heaters in the sensors are not heating up quick enough to allow them to start sampling the mixture. Has your fuel economy, performance or idle quality deteriorated from ~20K ago, or so?

twistedlizard72 12-02-2011 10:08 AM

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Its strange because my mileage has actually gotten better in the last 3k. I would average 16 mpg and change on my daily commute and recently have been averaging almost 18 mpg.

I cleared the code yesterday and filled up with 87 octane to allow the computer to learn me on a single tune. The CEL has not gone off again and its running good. Minimal gains, low and midrange RPM's feels like it has better power.

mrtosh 12-02-2011 10:42 AM

You should try running 89 on the 87 tune. I've seen the best results going this route.

90grandoneer 12-02-2011 11:09 AM

Twisted is in Wrightwood, Ca, which is at a fair altitude. Don't know exactly what it is though. Twisted??? I am at ~3000 ft. elevation (DA's usually run 4500+) and I can easily run 87, without KR issue, using the DS 93 tune. The only time I put 91/93 in is when I go racing. When I am driving at higher altitudes (above ~6000 ft.) I'll even run 85 without a problem. Rule of thumb is, one octane point less required for each 1000 ft. increase in elevation. Hey Twisted, do you know Bart Inglese?

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