obd 2 codes p-1635 and p-1639
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Asked by cap1976 Jun 21, 2016 at 09:04 PM about the 2000 Chevrolet Silverado 2500HD LS LB 4WD

Question type: Maintenance & Repair

throwing codes p-1635 and p-1639

2 Answers
41,805

Auto_Centric answered 7 years ago

The computer saying It does NOT like the AC circuit! The powertrain control module (PCM) uses the 5-volt reference 2 circuit as a sensor feed for the A/C refrigerant pressure sensor. The PCM monitors the voltage on the 5-volt reference 2 circuit. and its not friendly with the Manifold Absolute Pressure (MAP) sensor and the Engine Gas Recirculation (EGR) valve. all pretty simple to checkout. Regards

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