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Chevrolet
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2002
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Blazer 4D Utility, 4WD, Part Time
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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 - 4.3L
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Diagnostic Tests
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DTC P0128: ECT Less Than Thermostat Regulating Temperature
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Diagnostic Aids
Diagnostic Aids
A DTC P0128 is designed to detect a faulty thermostat.
A skewed ECT sensor may cause a P0128 to set.
A skewed IAT sensor may cause this DTC to set.