94 6.5 Turbo Diesel - Intermittent Code 78

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94 6.5 Turbo Diesel - Intermittent Code 78

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Chevrolet Forum >> Chevy Trucks, Vans & SUV's >> Suburban >> 94 6.5 Turbo Diesel - Intermittent Code 78

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94 6.5 Turbo Diesel - Intermittent Code 78 - 6/6/2008 7:56:59 PM

seldom352

Posts: 1
Joined: 6/6/2008
Status: offline

94 Silverado- 136K miles - intermittent "Service Engine Soon" light with code 78 - Exhaust Valve Control Solenoid Circuit Bank The truck seems to be running fine - no unusual noises or abnormal instrument readings - 16.1 mpg driving around town. The warning light is very intermittent - never stays on more than 5-10 seconds. Does anyone know: 1) What''s the probable cause/corrective action? 2) Does it need to be fixed right away or is it simply an emissions or other no-serious issue that can wait-I''m getting ready to take a 1200 mile road trip.