What causes the engine code P0027 to be set on a 2009 GMC 7500 7.8L Isuzu engine?
Hi there,
This code indicates an issue with the exhaust valve control. Here is a list of possible causes.
P0027 - Exhaust Valve Control solenoid Circuit Range/Performance Bank 1 Read more: https://www.autocodes.com/p0027.html
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