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2004 GMC T7500 T7F042 7.8L Limp Mode
Posted to GM Driveability on 5/31/2019 3 Replies

this unit developed this issue recently. It is equipped with a 6cyl 7.8l Isuzu turbo diesel. It intermittently goes into limp mode with a light illuminated on the instrument cluster for reduced power, no check engine light is illuminated. Sets a code p1087...

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car Vehicle Data

2004 GMC T7500 T7F042

VIN 1GDL7F1344
Engine7.8 L / 6 cyl / DIESEL
DeliveryFuel Injection / common rail injection (no ctf)
EmissionsOBD-II Compliant
SymptomsLimp Mode
OccursHot

Trouble Codes

P1087Tumble Generator Valve Position Sensor 2 High Input
Open Help Request

car Vehicle Data

2004 GMC T7500 T7F042

VIN 1GDL7F1344
Engine7.8 L / 6 cyl / DIESEL
DeliveryFuel Injection / common rail injection (no ctf)
EmissionsOBD-II Compliant
SymptomsLimp Mode
OccursHot

Trouble Codes

P1087Tumble Generator Valve Position Sensor 2 High Input