05 D/A driving steady 80mph on flat freeway, unloaded, check engine light came on, sudden loss of power. Pulled over to the shoulder, absolutely no power. Disconnected my edge, limped to a parts store and bought a scanner to read and reset the codes. I got a P0207 and a P2146 (actually, it listed them twice). Both are injector codes, the first is an open circuit in #7 and the second is an open circuit in group A. I assume the second code is a result of the first??????? Anyway, it has the same problem with the edge disconnected, so I'm ruling that out. I've gone to the connector at the injector and wiggled, pullled, pushed, disconnected and reconnected... sometimes the code will clear, sometimes it won't. Sometimes I can drive 10 miles before it does it again, sometimes it does it as soon as I put it in gear. Does anyone know of similar problems???? Could it just be the coil at the injector???? Is my dealer going to say "Oh yeah, we've seen/heard about quite a few of these, you'll be done in an hour." or are they going to get stumped and tear into the whole harness???? I have reset maybe 15 times and have been able to drive 15 miles total.
Any info would be appreciated.

DTC P0201-P0208 Injector Control Circuit

DTC P2146 Injector Positive Voltage Control Circuit Group 1


I wish I could help you out. I'm sure a tech on here will chime in very soon. How many miles on your truck?

Just under 5000 miles

take it to the dealer..

agree with Diesel Power, don't forget to take off the edge before the trip to the dealer.

The injector connector terminal for the #7 injector may be broken. There is a PI in the system that describes exactly what you said happend to your truck.

The same thing happened to me but I was going 50 towing a boat. The following trip to the dealer got me a brand new injector control module.

I dropped my truck at the dealer's night drop, (after removing the edge) I'll see what they have to say later today. I put a slight bend in the two pins on the injector and didn't have any problems for the 10 miles to the dealer, but I'm not exactly confident that it won't do it again soon. I'll update as soon as I get info.

So after bending the pins ever so slightly on the injector, the problem has yet to happen again in more than 100 miles. The problem never occured for the dealer so they were unable to offer any suggestions, but they did run a diagnostic for the 207 code and found nothing. I'll look for 1000 trouble-free miles before I declare that it was just a loose connection.

Over the weekend I had the same problem again after over 1000 trouble free miles. This time, I didn't mess with anything, removed the Edge (sent it in for V1.2) and took it to the dealer. They are going to replace the #7 injector, but they said it could take up to a week to find one???????? Can't they keep them in stock????

Replacing the injector will not solve this. They need to replace the Engine Harness. If they don't believe this, have them swap the #7 injector with the #5 and see if the code changes to P0205 and the P0207 goes away. It won't. The code will stay at P0207 because it is the #7 injector connector that is the problem.

Still not convinced? Clear the codes and idle the truck. Wiggle the #7 injector harness and watch the code come back and the bank shut down.

If they need more convincing, take the truck out of the shop and someplace quiet. Take off the #7 injector connector and give it a gentle shake. It's hard to hear, but it will rattle because of the broken terminal. Do the same thing to any other injector connector and they will not rattle. (need to have your ear pretty close to hear it)

I would hate for you to be out of your truck while they looked for an injector, only to find out that they need to order a harness next! Good Luck

I had the same problem after only 1050 miles on my 05' 2500/Duramax GMC. I "limped" to the dealer right away. The technician cleared the codes and we took her for a test drive. We didn't make it 300 yards from the dealer's location and had the same problem.

Got a call from the Technician the next day and he told me that the wiring harness was loose on my #2 injector. He replaced the wiring harness and I have had zero problems since then. I now have 3300 miles on my rig.

Hopfully, that will be the last problem.

Don't change out the injector...that will not fix your problem. Good Luck!!!

AKMuddy
2005HD Duramax GMC/SLT
2003 Yamaha Grizzly :grd:

just orderd a harness for an 05 with same code,wiggle or bend the connector and it will act up.GM is working on a connector repair kit

Thanks for the responses..... I talked with the service department and they're gonna do a little more to verify the true problem. I'll post any info as it comes along.

I spoke with the mechanic yesterday (in person). He spent the day on the phone with a GM "injector specialist" and through a battery of tests, was able to get the injector to fail, open when hot. So, he said he had one more person to talk to to authorize an injector to be shipped and I hope to have my pick-up back sometime next week....................

did they put a harness in your truck?

Not that I'm aware of........

For those of you who want to say "I told you so." :

For the record, I passed along the harness info to the guys at the dealer and they chose to persue the injector and even proved to themselves that they were right.............................

I picked up my pickup last night, drove 15 miles home, removed the stock front pipe, installed my MBRP front pipe, drove it up the hill to hear the sweet, sweet sound of the straight pipe that I haven't heard in over two weeks... wouldn't you know it, within a mile I had the same problem again, same codes, same injector....... YAY


SO..... it's back at the dealer and I reminded them that I suggested the harness over a week ago........ we'll see what happens. They've got 12 days before the Oregon Lemon Law applies to my vehicle............


I'd rather they just fix it

They've got 12 days before the Oregon Lemon Law applies to my vehicle............

I'd rather they just fix it
Well, all you have to remember is that Lemon Laws, although great, are VOLUNTARY. You have to choose to go through the process, they do not do it automaticly. Best of luck on getting your problem fixed.

John

ya need that harness but be carefull mine did just like yours freway quit limped to dealer 120 miles from home left and took rental replace main engine control harness and it works well sort of the harness was updated from my 04.5 and is incompatable with glow plug control and so we have one of those on order for a week no supply in canada aaaaggghhhh. But the truck runs fine so good luck a search of this site for engin harness might show up a post that addresses this.

all the best
the dog

Well, all you have to remember is that Lemon Laws, although great, are VOLUNTARY. You have to choose to go through the process, they do not do it automaticly. Best of luck on getting your problem fixed.

John
For the most part, I'd rather have it fixed than have a new truck with the same potential for problems

I hate to bump an old thread, but I searched and needing more help on this subject...

My 04.5 LLY was in the shop for this exact problem and had the engine wiring harness replaced 4,000 miles ago. 4,000 miles later...same exact problem and codes and at the dealership right now. Codes p0207, p0300, & p2146. 4,000 miles ago the wiring harness was replaced. My extended warranty covered the cost of the harness 4,000 miles ago. This time the service writer told me that if they have to contact the warranty company they will deny to pay because I have a aftermarket intake and exhaust on my truck. I had the same exact mods 4,000 miles ago when they replaced the wiring harness the 1st time.

Why did the same problem happen 4,000 miles later? Shouldn't GM have a warranty on their parts since it's only been 4,000 miles? How can a intake and exhaust cause a wiring problem and my extended warranty company decline to pay?

Well it has been a coupla months but here we go again wife had truck to friends go for coffee and bang hammers like crap throws codes limps home half a block check visual run code told here to go for coffee and we will see dealer in am this is getting tired

baredogg:ro)

There is now a service kit available through parts that will solve this problem. I guess that on some trucks the harness was routed so that there was more vibration into the #2 and #7 injector connectors. The service kit has some brackets that will more tightly control the harness routing and reduce that vibration. Supposed to keep this problem from coming back.

I'll spare everyone of the details concerning my experience yesterday (100 miles from home) with Onstar and GM Roadside Service.

Anyway, cruising down the highway, loss of power, check engine light comes on, would barely idle after this. Codes P0207 and P2164 came in, would only reset momentarily then come right back in. Removed the juice/attitude and still no change.

Got towed in. Talked with dealer this morning and "it is" the injector connectors on the harness. They did not have the retro kit in stock. Ordered it overnight today, so it should be the Tuesday (because of the holiday). Just another day as they say in the land of diesel power. :rolleyes:

exactly same thing happend to me yesterday.

just driving, engine light, no power.
Kinda drove it to the dealer.
Paid $283 + rental car to have the wiring harness repaired or replace because it rubbed through (so I as told).

mechanic took it for a test drive, happend again and blamed the edge.
Disconnected the edge and... No problem.
Drove it home, started it up 2 hours later, same thing with no edge connected (which I already UPSed overnight to edge).

Now they are telling mw they need to replace another wiring harness which indeed has to be overnighted and will be in on tuesday!

This truck is giving a lot of grief in such a short time (Since Dec. '04)
Radio replaced (second one is bad to) warranty
Torque converter replaced. warranty
Fuel module replaced. warranty
signal flasher box. warranty (small thing)
and now wiring harnesses ($$$ no warranty) 40k miles on truck

That is another issue with the harness rubbing through on the Fuel Injector Control Module bracket (Silver electronic module mounted on the RH front of the engine). Everybody with an LLY should find where the harness is tied to this bracket and slip something in between the harness and the aluminum tab it rests against to prevent the rub through. I would suggest a piece of heater hose, but a bunch of wraps with electrical tape will work too (at least 5 over the area of contact).

Just a follow up on my truck. It took the dealer 1 week to get this part and I'm finally back in service.
I've also listed the TSB below that talks about this problem. Good luck to all. :)




04 05 6.6 LLY Fuel Injector Driver Circuit Codes P0201 through P0208 - kw P0202 P0203 P0204 P0205 P0206 P0207 P2146 P2149 intermittent SES miss misfire DTC MIL GMT800 GMT560 #PIP3238 - (Nov 16, 2004)

04 05 6.6 LLY Fuel Injector Driver Circuit Codes P0201 through P0208

.

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:

Intermittent SES or MIL light on with injector driver trouble codes P0201 P0202 P0203 P0204 P0205 P0206 P0207 P0208 and bank shutdown trouble codes P2146 or P2149.

Recommendation/Instructions:

1.
2. Complete normal SI diagnosis for the trouble codes set.
3. Injector circuit or injector coil tests may be normal until the engine reaches operating temperature, recheck circuit/injector resistance readings with warm engine.
4. Inspect for wire harness chafes on the Fuel Injection Control Module (FICM) wiring harness retaining bracket. This is an aluminum bracket very close to the FICM connectors.
5. If diagnosis is inconclusive, inspect the injector connections on all related cylinders. Pin drags and terminal tension can be checked with Kent Moore tool number J-35616-4A.
6. Clear trouble codes, then wiggle test related injector connectors to see if trouble codes can be induced.
7. If the trouble codes or customer concern is induced during the wiggle test, replace the complete engine wiring harness. At this time there is no repair for the terminals or connectors at the injector
8. If the engine harness needs to be replaced please make a Field Product Report. In the Field Product Report include the customers complaint, the symptoms that you observed, any trouble codes set, the troubleshooting steps that were performed, and any other information that helps describe what you found and repaired.
9. Engineering is requesting the case be closed with labor operation N6606 for tracking purposes.

Note: If the 6.6 LLY diesel engine harness needs to be replaced for a terminal tension concern, do not cut the harness. At this time the harness is not serviced with any type of pigtail repair. Replace the harness as a complete harness assembly.

Note: Dealer technicians are to repair wire chafes at the Fuel Injection Control Module (FICM) as needed. Follow the correct SI wiring repair procedures. Insulate the harness from the aluminum retaining bracket with suitable material ( electrical conduit or heater hose ) so the harness will not chafe again.

Note: When diagnostics are being completed for Injector Driver Fault codes the dealer technician may notice the Fuel Injection Control Module (FICM) connector is wet or has a wet residue on it. The FICM connectors do have a type of dielectric grease that may be mistaken for diesel fuel. The FICM should not be replaced if this type of wet residue is found. Clean and dry the connectors as needed. No extra dielectric grease needs to be added to the FICM connectors.

.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:

(04 05 6.6 LLY C2 C3 K2 K3 Chevrolet Silverado, GMC Sierra GMT800) and (04 05 6.6 LLY C4 C5 E4 E5 D4 D5 Chevrolet Kodiak, GMC Topkick GMT560)

My '05 LLY with less than 4000 miles laid down a couple of weeks ago - lost power and the check engine light came on. Had it towed to the nearest GMC dealer. Found this thread and read about the cause -injector connector failure due to vibration. The service manager
agreed that this was the problem and ordered the service kit to make the repair. However, GM is saying that the parts won't be available until November 7th, and there are none to be had in the dealer network.

I'm without my truck for two weeks and he's telling me it could be another month or more. I don't think so. I pressed him to install a new wiring harness to get me going and that I would bring the truck back in when the repair kit arrives. He agreed and ordered the new harness. Should be here in a day or two.

I'm documenting all of this in case I have to file under the Texas lemon law.

What hacks me is that GM knows this problem exists. If they are unwilling to do a recall, there should at least be sufficient inventory of the repair kits available. Having to wait another month or more for the kit is BS.

Many thanks to all who contributed to this discussion. With the knowledge gained from this forum, I was right on top of the problem.

Hopefully it will be the last.

I fully agree 200%, it should be a recall !!! My dealer told me this "kit" came directly from Izuzu, not a GM parts supply. :mad: