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Forums > The Garage > Trucks [ Eighteen Wheelers ] > Heavy Duty Diesel Truck Mechanics Forum > 12.7 - Intermittent code 61 - injector response long

12.7 - Intermittent code 61 - injector response long

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RepoweredRookie, Jul 5, 2025.

Jul 5, 2025 #1

RepoweredRookie Light Load Member

138

122

Apr 16, 2019

0

Hey guys,

I have 1999 Freightliner Century 12.7 series 60. I keep getting loss of power and flash code 61 - “injector response time long”, BUT it returns to normal after 3-4 minutes and the code goes inactive.

I have cleaned all grounds well, but issue keeps happening intermittently. Is it worth pulling/testing ECM, or do I just replace wiring harness and possibly the injector? Thank you in advance.

RepoweredRookie, Jul 5, 2025

RepoweredRookie, Jul 5, 2025

#1
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Jul 5, 2025 #2

Big Road Skateboard Road Train Member

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33,345

May 2, 2021

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I would always check wiring, but response time faults are usually the solenoid failing

Big Road Skateboard, Jul 5, 2025

Big Road Skateboard, Jul 5, 2025

#2

Heavyd, Rideandrepair and RepoweredRookie Thank this.

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Forums > The Garage > Trucks [ Eighteen Wheelers ] > Heavy Duty Diesel Truck Mechanics Forum > 12.7 - Intermittent code 61 - injector response long

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