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H2 4D Utility Pickup
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DTC P0521 (5.3 L Engine)
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Conditions for Clearing the DTC (5.3 L Engine)
Conditions for Clearing the DTC (5.3 L Engine)
The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 40 malfunction-free warm-up cycles.