P0602 Code - Control Module Programming Error

What Does P0602 Mean?

This diagnostic trouble code (DTC) indicates a programming error within the Engine Control Module (ECM).

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What are the common causes of P0602 ?

An air leak forward of the DPF will change the sensor readings resulting in the code

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.



How do you troubleshoot P0602 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0602 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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