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This was proven to fix the Service Engine Soon Light on a 2001 Chevy Blazer may also fix other models of Chevrolet and years

Check the bottom of this post for all the DTC codes for the Chevrolet Blazer



The Service Engine Soon Light on Chevrolet's is the equivalent to the CEL (Check Engine Light) on many other vehicles.

Service Engine Soon Light with a code of P0440 is an OBD-II:

Evaporative Emission Control System Malfunction.

Clear as mud right??? :)

The first thing to check would be the



GAS CAP !! of all things to set a CEL or Service Engine Light.



Have your local person that was kind enough to hook their code reader back up and clear the code after tightening up your gas cap or making sure the O-Ring on the cap is not dry rotted or damaged. If it is replace it and drive around for a few days and see if the light stays off...

Stay tuned for more information on this P0440 Code.. will be adding more info soon.


P0102 Mass Air Flow circuit Low Input.
P0103 Mass Air Flow circuit High Input.
P0106 EGR Barometric Pressure Sensor Input Signal is out of Self-Test Range.
P0107 EGR/BARO Signal circuit is Less Than Self-Test minimum.
P0108 EGR Barometric Pressure Sensor Input Signal is out of Self-Test Range.
P0112 Intake Air Temperature circuit Low Input.
P0113 Intake Air Temperature circuit High Input.
P0117 Engine Coolant Temperature circuit Low Input.
P0118 Engine Coolant Temperature circuit High Input.
P0121 In-Range Operating Throttle Position Sensor circuit failure.
P0122 Throttle Position Sensor circuit Low Input.
P0123 Throttle Position Sensor circuit High Input.
P0125 Insufficient Coolant Temperature to enter Closed Loop.
P0126 Insufficient Coolant Temperature for Stable Operation.
P0131 Upstream Heated Oxygen Sensor circuit out of range - Bank No. 1.
P0132 Upstream Heated Oxygen Sensor circuit Voltage High - Bank No. 1.
P0133 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 1.
P0135 Upstream Heated Oxygen Sensor Heater circuit fault - Bank No. 1.
P0136 Downstream Heated Oxygen Sensor circuit fault - Bank No. 1.
P0138 Downstream Heated Oxygen Sensor circuit Voltage High - Bank No. 1.
P0140 Downstream Heated Oxygen Sensor circuit Faulty - Bank No. 1.
P0141 Downstream Heated Oxygen Sensor Heater circuit fault - Bank No. 1.
P0151 Upstream Heated Oxygen Sensor circuit out of range - Bank No. 2.
P0152 Upstream Heated Oxygen Sensor circuit Voltage High - Bank No. 2.
P0153 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2.
P0155 Upstream Heated Oxygen Sensor Heater circuit fault - Bank No. 2.
P0156 Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.
P0158 Downstream Heated Oxygen Sensor circuit Voltage High - Bank No. 2.
P0160 Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.
P0161 Downstream Heated Oxygen Sensor Heater circuit fault - Bank No. 2.
P0171 System Too Lean - Bank No. 1.
P0172 System Too Rich - Bank No. 1.
P0174 System Too Lean - Bank No. 2.
P0175 System Too Rich - Bank No. 2.
P0176 Flexible Fuel Sensor.
P0180 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0181 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0182 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0183 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0187 Engine Fuel Temperature Sensor circuit.
P0188 Engine Fuel Temperature Sensor circuit.
P0190 FRP Sensor Signal Low.
P0191 Engine Fuel Temperature Sensor circuit.
P0192 Engine Fuel Temperature Sensor circuit .
P0193 Engine Fuel Temperature Sensor circuit.
P0222 Throttle Position Sensor B circuit Input Low.
P0223 Throttle Position Sensor B circuit Input High.
P0230 Fuel Pump Primary circuit fault.
P0231 Fuel Pump Secondary circuit Low.
P0232 Fuel Pump Secondary circuit High.
P0300 Random Misfire Detected.
P0301 Misfire Detected - Cylinders 1-10.
P0302 Misfire Detected - Cylinders 1-10.
P0303 Misfire Detected - Cylinders 1-10.
P0304 Misfire Detected - Cylinders 1-10.
P0305 Misfire Detected - Cylinders 1-10.
P0306 Misfire Detected - Cylinders 1-10.
P0307 Misfire Detected - Cylinders 1-10.
P0308 Misfire Detected - Cylinders 1-10.
P0309 Misfire Detected - Cylinders 1-10.
P0310 Misfire Detected - Cylinders 1-10.
P0320 Ignition Engine Speed (PIP) Input circuit fault.
P0325 A Spark Knock Occurred - Sensor Circuitry did not respond.
P0326 Spark Knock has not been sensed.
P0330 A Spark Knock occurred - Sensor Circuitry did not respond.
P0331 Spark Knock has not been sensed.
P0340 Camshaft Position Sensor circuit fault.
P0350 Ignition Coil Primary circuit fault.
P0351 Ignition Coil A Primary circuit fault.
P0352 Ignition Coil