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Last Updated: September 28, 2026
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Cold mornings can be tough on diesel Is your diesel truck struggling on chilly mornings and guzzling fuel out of nowhere. You need to know how to fix The video focuses on the basic GMC specific diagnostic ⚠️ Error Code: P0640 - Intake Air Heater Malfunction. This code indicates that the PCM detects a problem in the circuit that ...
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