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Chevrolet Silverado / GMC Sierra. Manual - part 2348
Courtesy of GENERAL MOTORS CORP.
Fig. 2: Mode and Temperature Controls
Courtesy of GENERAL MOTORS CORP.
2008 Chevrolet Silverado 1500
2008 HVAC HVAC - Manual - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 3: A/C Compressor Controls C67
Courtesy of GENERAL MOTORS CORP.
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC CODE INDEX
DIAGNOSTIC CODE INDEX
DTC
Description
DTC B0228, B0413,
B0423, or B3779
B0228 02: Recirculate Position Feedback Circuit Short to
Ground
B0228 05: Recirculate Position Feedback Circuit Short to
Battery or Open
B0228 61: Recirculate Position Circuit Actuator Stuck
B0413 02: Temperature Control 1 Feedback Circuit Short to
Ground
B0413 05: Temperature Control 1 Feedback Circuit Short to
Battery or Open
B0413 61: Temperature Control 1 Feedback Circuit Actuator
Stuck Open
2008 Chevrolet Silverado 1500
2008 HVAC HVAC - Manual - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DTC B0228, B0413, B0423, OR B3779
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC B0228 02
Recirculate Position Feedback Circuit Short to Ground
DTC B0228 05
Recirculate Position Feedback Circuit Short to Battery or Open
DTC B0228 61
B0423 02: Temperature Control 2 Feedback Circuit Short to
Ground
B0423 05: Temperature Control 2 Feedback Circuit Short to
Battery or Open
B0423 61: Temperature Control 2 Circuit Actuator Stuck
B3779 02: Air Flow Control 9 Feedback Circuit Short to
Ground
B3779 05: Air Flow Control 9 Feedback Circuit Short to
Battery or Open
B3779 61: Air Flow Control 9 Circuit Actuator Stuck
DTC P0532 or P0533
P0532: Air Conditioning A/C Refrigerant Pressure Sensor
Circuit Low Voltage
P0533: Air Conditioning A/C Refrigerant Pressure Sensor
Circuit High Voltage
DTC P0645
P0645: A/C Clutch Relay Control Circuit
DTC P0646 or P0647
P0646: Air Conditioning (A/C) Clutch Relay Control Circuit
Low Voltage
P0647: Air Conditioning (A/C) Clutch Relay Control Circuit
High Voltage
2008 Chevrolet Silverado 1500
2008 HVAC HVAC - Manual - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Recirculate Position Circuit Actuator Stuck
DTC B0413 02
Temperature Control 1 Feedback Circuit Short to Ground
DTC B0413 05
Temperature Control 1 Feedback Circuit Short to Battery or Open
DTC B0413 61
Temperature Control 1 Feedback Circuit Actuator Stuck Open
DTC B0423 02
Temperature Control 2 Feedback Circuit Short to Ground
DTC B0423 05
Temperature Control 2 Feedback Circuit Short to Battery or Open
DTC B0423 61
Temperature Control 2 Circuit Actuator Stuck
DTC B3779 02
Air Flow Control 9 Feedback Circuit Short to Ground
DTC B3779 05
Air Flow Control 9 Feedback Circuit Short to Battery or Open
DTC B3779 61
Air Flow Control 9 Circuit Actuator Stuck
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
2008 Chevrolet Silverado 1500
2008 HVAC HVAC - Manual - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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