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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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Old 07-20-2019, 01:36 PM
chessy56 chessy56 is offline
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Join Date: Jan 2006
Location: South Milwaukee, WI
Posts: 230
Default P029d, p026d

2017 L5P Dmax with ~89K miles. Had a P029D code surface which set the CEL. Was able to clear; did not return after 2 add'l start cycles. However, the next day a P026D was found when interrogating the trouble codes with my Edge monitor. CEL not set with this code. Looks like a possible fault with my #1 injector? Balance rates (for what it's worth) show no appreciable difference between the 8 injectors.

Anyone else have this problem with their L5P? I'll be contacting the dealership after the weekend. Bad injector? Possible leakage? Hopefully, if repairs are req'd, it will be covered under the Powertrain/Drivetrain warranty. This makes 7 different trouble codes that I've had since buying this truck in 2017.
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"Chessy56"
So. Milwaukee, WI
'01 2500HD, LB7, 440K miles
"Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

'17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!!) Currently bone stock, 90K miles.

"Socialism is a philosophy of failure, the creed of ignorance and
the gospel of envy. Its inherent virtue is the equal sharing of misery."
Winston Churchill
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Old 07-25-2019, 12:41 PM
chessy56 chessy56 is offline
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Join Date: Jan 2006
Location: South Milwaukee, WI
Posts: 230
Default

update- dealership says no trouble found. Continue to monitor it. At least the tank heater replacement parts have been ordered under GM's recall.
__________________
"Chessy56"
So. Milwaukee, WI
'01 2500HD, LB7, 440K miles
"Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

'17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!!) Currently bone stock, 90K miles.

"Socialism is a philosophy of failure, the creed of ignorance and
the gospel of envy. Its inherent virtue is the equal sharing of misery."
Winston Churchill
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