Duramax Diesels Forum Truck of the Week
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Old 05-05-2010, 06:39 PM
Rnolan Rnolan is offline
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Default Rough idle- injector control circuit

I drove my truck all weekend and parked it Sunday night. On tuesday morning I started it up and the low fuel light came on. I JUST FILLED IT UP SUNDAY. It started to idle really rough, wouldn't rev above about 1800RPMs and has no power. Sometimes it will start and run fine for about a minute, then go back to doing the same thing.
Here are the codes that came up. Anyone know where I can start?
efilive snip.JPG
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Last edited by Rnolan; 05-05-2010 at 06:39 PM.
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  #2  
Old 05-05-2010, 06:42 PM
Rnolan Rnolan is offline
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The codes are:
P0201 INJECTOR 1 CONTROL CIRCUIT
P0204 INJECTOR 4 CONTROL CIRCUIT
P0206 INJECTOR 6 CONTROL CIRCUIT
P0207 INJECTOR 7 CONTROL CIRCUIT
P1261 INJECTOR POSITIVE VOLTAGE CONTROL CIRCUIT GROUP
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  #3  
Old 05-29-2010, 06:04 AM
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steakman steakman is offline
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Location: Barrie, Ontario
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Engine: LBZ
Transmission: Automatic
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did you get this figured out..??

Well seeing as I am having similar issues. This is an electrical issue. I know it happens frequently to LLY and LB7 engines. Guys have told me that to check the injector harness where it goes to the FICM. It is apparently tie wrapped at some point to the alternator bracket at a sharp edge. Yolu may have some seriously chafed wires there..??

I'm still trying to figure my issue out but its on an LBZ and supposedly these issues do nto happen to them..yea right.! I threw P2149/P0207 ... Injector # 7 did the Ice pick manouvre..still no joy. I have connectivity but it isnt 100%.

Good luck and I'll watch this thread as well as start a new post on my issues and questions.

cheers,

Theo
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Last edited by steakman; 05-29-2010 at 06:05 AM.
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  #4  
Old 05-29-2010, 06:54 AM
jlawles2 jlawles2 is offline
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Join Date: Jan 2010
Location: Danbury, TX
Truck: CCSB 4WD
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On the 02, check for harness rub. The wiring harness rubs on the aluminum bracket for the alternator and wears the insulation off the wires, then they go to ground and it causes issues. Common on most of the trucks.

If you do have harness rub, fix the missing insulation, broke wires. Then use a piece of rubber heater hose to protect the wires from rubbing through again.
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Old 01-04-2014, 06:12 PM
Vernon Stoltzfus Vernon Stoltzfus is offline
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What did you guys find on this issue? have the same thing on a lmm
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  #6  
Old 03-10-2014, 05:44 AM
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MaxSmoke MaxSmoke is offline
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Did you figure out what the issue was? Just did injectors on my buddy's 03 sat and having the exact same problem after we fired it up. Thanks!
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