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Chevrolet
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2003
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Silverado 1500 HD, 4WD
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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 P2120: App Sensor 1 Circuit Malfunction
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Conditions For Running DTC
Conditions For Running DTC
DTCs P0601, P0602, P1518, or P2108 are not set.
The ignition switch is in the crank or run position.
The ignition voltage is more than 5.23 volts.