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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 P0135: Ho2S Heater Circuit - Bank 1, Sensor 1 & DTC P0155: Ho2S Heater Circuit - Bank 2, Sensor 1
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Conditions For Setting DTC
Conditions For Setting DTC
The PCM detects that the affected HO2S Heater current parameter is less than 0.25 amps, or more than 1.375 amps (4.8L) or 3.125 amps (5.3L & 6.0L).
The above condition is met for 10 seconds.