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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 P0128: ECT Less Than Thermostat Regulating Temperature
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Conditions For Setting DTC
Conditions For Setting DTC
The calibrated amount of engine run time has been met.
The calibrated amount of engine air flow has been met.
The calibrated minimum engine coolant temperature of 167° F (75° C) has not been met.