Dtc p1128, p1129 - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 16 (permalink) Old 07-31-2010, 07:49 PM Thread Starter
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Dtc p1128, p1129

I ran some E-85 today and the Commander threw-up. It shows P1128 and P1129. Online sources show this as a TSB for using 35-40% Ethanol. The Commander had some regular unleaded in it when I filled it. Anyhow, can I shut this off myself? The Commander is out of warranty and I don't want to pay for a reflash if I can avoid it.
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post #2 of 16 (permalink) Old 07-31-2010, 10:40 PM
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Quote:
Originally Posted by Therocks View Post
I ran some E-85 today and the Commander threw-up. It shows P1128 and P1129. Online sources show this as a TSB for using 35-40% Ethanol. The Commander had some regular unleaded in it when I filled it. Anyhow, can I shut this off myself? The Commander is out of warranty and I don't want to pay for a reflash if I can avoid it.
What year and does your Commander have flex fuel capability?
(Meaning, is it a E-85 4.7 V-8?)

Rob


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post #3 of 16 (permalink) Old 08-01-2010, 06:22 AM
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P1128 - CLOSED LOOP FUELING NOT ACHIEVED - BANK 1
P1129 - CLOSED LOOP FUELING NOT ACHIEVED - BANK 2


When Monitored:
Engine running in closed loop mode.

Set Condition:
Enable conditions are met and the 02 sensor has not been in closed loop control at least once on each of the two consecutive trips, the MIL illuminates and the DTC is set. Two Trip Fault. Three good trips to turn off the MIL


Possible Causes
  • RESTRICTED FUEL SUPPLY LINE
  • FUEL PUMP INLET STRAINER PLUGGED
  • FUEL PUMP MODULE
  • O2 SIGNAL CIRCUIT
  • O2 RETURN CIRCUIT
  • O2 SENSOR HEATER OPERATION
  • O2 SENSOR
  • MAP SENSOR OPERATION
  • ECT SENSOR OPERATION
  • ENGINE MECHANICAL PROBLEM
  • FUEL FILTER/PRESSURE REGULATOR (HIGH)
  • PCM

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OME 2" Lift kit


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post #4 of 16 (permalink) Old 08-01-2010, 07:40 AM Thread Starter
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The Commander is an '07 with the 4.7 flex. These are not generic codes. Chrysler has a TSB for a problem with ethanol use. I'm just wondering if I can turn off the check engine light myself.
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post #5 of 16 (permalink) Old 08-01-2010, 11:41 AM
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For others that may encounter this problem, here is the TSB--->http://www.xkjeeps.com/tsb/tsb_xk_1804007.pdf

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post #6 of 16 (permalink) Old 08-01-2010, 11:55 AM
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Just unhook the battery for a while. That will clear the codes.

06 Sport-4.7L with QT2

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post #7 of 16 (permalink) Old 08-01-2010, 03:48 PM Thread Starter
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I was hoping that removing a battery cable would reset it. I will need to wait until I run the E-85 out so the light doesn't come back on. Everything seems to work except the factory remote start. It starts and runs for about 5 seconds and shuts off. I'm thinking it won't let you run the vehicle with a DTC code in place.
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post #8 of 16 (permalink) Old 08-02-2010, 11:45 AM
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Hope it's not going away, it had some good info.
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post #9 of 16 (permalink) Old 08-02-2010, 05:59 PM Thread Starter
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I put some non E-85 in the XK today and ran a few errands. The check engine light went off and the remote start is now working again. I'll have to see if it stays off but, for now everything is back to normal.
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post #10 of 16 (permalink) Old 05-30-2012, 07:54 AM
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Dtc P1128 and P1129

Just got this code yesterday. I've read through this thread and was wondering if anyone has had this since, and what was the culprit? And what does "engine running in closed loop" mean? Also, I never run less than 87 oct and have the 3.7L


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