Question

2004 Chevrolet Silverado, the C and EV are flashing on my scanner, what does that mean? the truck sat for a few months with a dead battery, the truck won't pass CA smog

Answer 1

OBDII scanners communicate with the Engine Control Module (ECM) to verify all the systems are ready to test. The system initial or name will flash to indicate that the system is not ready, and the smog test will fail or not be complete.

• M = Misfire
• F = Fuel System
• CC = Comprehensive Component
• HC = Heated Catalyst
• C = Catalyst
• EV = Evaporative System
• 2A = Secondary Air System
• O = Oxygen Sensor Heater
• E = Exhaust Gas Recirculation

Answer 2

Without monitor being ready the vehicle will fail the smog test the flashing C means that monitor is complete, The EV is a pending monitor, To ensure the monitor get complete have a battery that can maintain its charge, have the fuel tank at 1/4 to 3/4 this will ensure the EVAP monitor get completed.