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Chevrolet
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2003
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Silverado 1500 HD, RWD
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline
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Diagnostic Tests
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DTC P0169: Fuel Composition Sensor - High Alcohol Content Detected (5.3L Flex-Fuel)
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Conditions For Running DTC
Conditions For Running DTC
The ECT and IAT have less than 8°F (4.5°C) difference at cold start up.