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  #1  
Old 07-20-2010, 10:48 PM
nitro1965 nitro1965 is offline
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Default need help with p1128 dtc code

hello, i have a 2006 dodge ram 1500 quad cab 4 x4 with a 5.7 hemi. it is an automatic with 45,000 miles.the problem i have been having for the past 3 weeks is that the engine lite came on . i read the code and it was p300 which i was told is a misfire code, and the other code p1128 is a manufacturer dtc code. i put new oem spark plugs in .a friend of mine owns a auto garage and has a snap on mathis code reader which reades everything on your vehicle. we could not pin point the issue.has anyone come across a p1128 code . my truck does at times seems to run sluggish but not bad .it seems to be running fine. evertime i tried to reset the code it just comes back. if i could have some input on what could be the issue it would be helpfull
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Old 07-22-2010, 10:14 AM
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chefred112 chefred112 is offline
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how did the old plugs look? colorwise? gaps ok? maybe check an clean throttle body as well..
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Old 07-22-2010, 10:20 AM
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P1128 indicates the left bank of your engine isn't achieving closed loop mode. Possible causes are:

RESTRICTED FUEL SUPPLY LINE, FUEL PUMP INLET STRAINER PLUGGED, FUEL PUMP MODULE, O2 SIGNAL CIRCUIT, O2 RETURN CIRCUIT, 1/1 O2 SENSOR, MAP SENSOR, ECT SENSOR, ENGINE MECHANICAL PROBLEM, FUEL FILTER/PRESSURE REGULATOR, POWERTRAIN CONTROL MODULE (PCM)
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Old 07-23-2010, 01:06 AM
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Quote:
Originally Posted by chefred112 View Post
how did the old plugs look? colorwise? gaps ok? maybe check an clean throttle body as well..
the plugs looked normal other than the gap being more than .45. when i put in new oem plugs i made sure they all had a .45 gap. i did clean the throttle body it had some black carbon all around it .i also took the throttle body plate off to clean deeper in side.the truck still throws out the p1128 code ,and today it also threw out a p0132 code which is an o2 sensor.the truck is starting to run rough at idle but while driving it seems normal.
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Old 07-23-2010, 03:11 AM
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how about the pcv valve? cheap enough to just replace
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Old 07-23-2010, 06:49 AM
Troybigred79 Troybigred79 is offline
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I have had quite a few issues with the o2 sensors on the Hemi engines. Try and look at the fuel adaptives for bank 1 and see if they are way negative. I have had alot of these come to the dealer now with p0300 codes and after diagnosing, I have been replacing 1/1 and 1/2 o2 sensors and the issue correct itself. I think a 2006 should still cover the sensors under warranty due to it being an emissions related problem. hope this helps
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Old 07-23-2010, 07:34 AM
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Quote:
Originally Posted by Troybigred79 View Post
I have had quite a few issues with the o2 sensors on the Hemi engines. Try and look at the fuel adaptives for bank 1 and see if they are way negative. I have had alot of these come to the dealer now with p0300 codes and after diagnosing, I have been replacing 1/1 and 1/2 o2 sensors and the issue correct itself. I think a 2006 should still cover the sensors under warranty due to it being an emissions related problem. hope this helps
Really? I haven't seen that at our dealership but I'll keep it in mind. Are you seeing it on the non-MDS engines as well?
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Old 09-24-2013, 06:01 PM
ddemartino ddemartino is offline
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im having the same issue. seems to do it only when its cold. did you find the problem?
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