Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 2

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Trouble Code: P0116



Engine Coolant Temperature (ECT) Sensor Performance

Possible Causes:



Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.
 
An IAT sensor that is skewed colder at various ambient temperatures due to greater resistance than is normal will increase the range between these two sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature vs Resistance table. Refer to Temperature Versus Resistance .
 
A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors. This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.
 

Trouble Code: P0117



Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

Possible Causes:



An overheating condition may cause this DTC to set.
 
After starting the engine, the ECT should rise steadily to about 90°C (194°F) then stabilize when the thermostat opens.
 
Use the Temperature vs. Resistance table to test the ECT sensor at various temperature levels to evaluate the possibility of a skewed sensor. A skewed sensor could result in poor driveability concerns. Refer to Temperature vs Resistance .
 
If the condition is suspected of being intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0117



Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

Trouble Code: P0118



Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

Possible Causes:



If a short to a separate 5-volt source occurs, this DTC may set.
 
After starting the engine, the ECT should rise steadily, then stabilize when the thermostat opens.
 
Use the Temperature vs. Resistance table to test the ECT sensor. A skewed sensor could result in poor driveability conditions. Refer to Temperature vs Resistance .
 
If the condition is suspected of being intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0118



Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

Trouble Code: P0120



Throttle Position (TP) Sensor 1 Circuit

Trouble Code: P0121



Throttle Position (TP) Sensor 1 Performance

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
If there is a condition with the TP sensors, the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0121



Throttle Position (TP) Sensor 1 Performance

Trouble Code: P0122



Throttle Position (TP) Sensor 1 Circuit Low Voltage

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
If there is a condition with the TP sensors, the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0122



Throttle Position (TP) Sensor 1 Circuit Low Voltage

Trouble Code: P0123



Throttle Position (TP) Sensor 1 Circuit High Voltage

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
If there is a condition with the TP sensors, the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0123



Throttle Position (TP) Sensor 1 Circuit High Voltage

Trouble Code: P0128



Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Trouble Code: P0128



Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Possible Causes:



Inspect the ECT sensor terminals for corrosion, and for engine coolant leaking through the sensor.
 

Trouble Code: P0128



Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Possible Causes:



DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.
 
Inspect the ECT sensor terminals and the ECT harness connector for corrosion. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
 
This diagnostic runs in a specific range. Measure and record the resistance of the ECT sensor at various ambient temperatures between -7 to +80°C (+19 to +176°F), then compare those measurements to the Temperature Versus Resistance table.
 
A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
 

Trouble Code: P0131



HO2S Circuit Low Voltage Bank 1 Sensor 1

Trouble Code: P0132



HO2S Circuit High Voltage Bank 1 Sensor 1

Trouble Code: P0133



HO2S Slow Response Bank 1 Sensor 1

Trouble Code: P0134



HO2S Circuit Insufficient Activity Bank 1 Sensor 1

Trouble Code: P0135



HO2S Heater Performance Bank 1 Sensor 1

Trouble Code: P0136



HO2S Circuit Bank 1 Sensor 2

Trouble Code: P0137



HO2S Circuit Low Voltage Bank 1 Sensor 2

Trouble Code: P0138



HO2S Circuit High Voltage Bank 1 Sensor 2

Trouble Code: P0140



HO2S Circuit Insufficient Activity Bank 1 Sensor 2

Trouble Code: P0141



HO2S Heater Performance Bank 1 Sensor 2

Trouble Code: P0141



HO2S heater Performance Bank 1 Sensor 2

Trouble Code: P0151



HO2S Circuit Low Voltage Bank 2 Sensor 1

Trouble Code: P0152



HO2S Circuit High Voltage Bank 2 Sensor 1

Trouble Code: P0153



HO2S Slow Response Bank 2 Sensor 1

Trouble Code: P0154



HO2S Circuit Insufficient Activity Bank 2 Sensor 1

Trouble Code: P0155



HO2S Heater Performance Bank 2 Sensor 1

Trouble Code: P0156



HO2S Circuit Bank 2 Sensor 2

Trouble Code: P0157



HO2S Circuit Low Voltage Bank 2 Sensor 2

Trouble Code: P0158



HO2S Circuit High Voltage Bank 2 Sensor 2

Trouble Code: P0160



HO2S Circuit Insufficient Activity Bank 2 Sensor 2

Trouble Code: P0161



HO2S Heater Performance Bank 2 Sensor 2

Trouble Code: P0171



Fuel Trim System Lean Bank 1

Possible Causes:



The system may become lean if an injector is not suppling enough fuel.
 
Excessive resistance in the fuel injector control and/or the ignition 1 voltage circuits may cause the following symptoms:

A lean condition
 
Misfire
 
Rough idle Refer to DTC P0201-P0208
 

A lean condition could be present during high fuel demand.Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0171



Fuel Trim System Lean Bank 1

Trouble Code: P0172



Fuel Trim System Rich Bank 1

Possible Causes:



Fuel contamination, such as water or alcohol will effect fuel trim.
 
A malfunctioning MAF sensor can cause a rich condition and set this DTC. Refer to DTC P0101 .
 
Review Failure Records with a scan tool.
 
If an intermittent condition is suspected , refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0172



Fuel Trim System Rich Bank 1

 
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