Envoy, Rainer, Trailblazer 2006-2007

4.2L L6 VIN S Auto 1

Print

4.2L L6 VIN S Auto

Trouble Code: C0241



Powertrain Control Module (PCM) Indicated Requested Torque Malfunction

Trouble Code: C0241



Pulse Width Modulated (PWM) Requested Torque

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Wiring Repairs
 
Connector Repairs
 

Trouble Code: C0241



Powertrain Control Module (PCM) Indicated Requested Torque Malfunction

Possible Causes:



Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: C0244



Pulse Width Modulated (PWM) Delivered Torque

Possible Causes:



It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
 
If an intermittent malfunction exists, refer to Checking Aftermarket Accessories .
 
Possible causes for DTC C0244 to set:

An open in the torque delivered control circuit
 
Torque Delivered Control circuit shorted to ground or voltage
 
A communication frequency problem
 
A communication duty cycle problem
 
Torque delivered control circuit has a wiring problem, terminal corrosion, or poor connections
 
EBCM not receiving information from the PCM
 

 

Trouble Code: C0244



Pulse Width Modulated (PWM) Delivered Torque

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Wiring Repairs
 
Connector Repairs
 

Trouble Code: C0244



Pulse Width Modulated (PWM) Delivered Torque

Possible Causes:



Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0013



Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit

Trouble Code: P0014



Exhaust Camshaft Position (CMP) System Performance

Possible Causes:



The scan tool cam phase control function increments the cam phaser in 10 percent increments. Each increment equates to 2.5 degrees of cam phasing. A cam phase angle of 15 degrees is achieved by commanding the phaser with the scan tool to 60 percent.
 
Inspect any engine mechanical work that has been performed recently. Verify that the engine timing has not been altered.
 
If this DTC is set along with any crankshaft position (CKP) or camshaft position (CMP) sensor DTCs, then both the CKP and CMP sensor DTCs should be diagnosed prior to performing this diagnostic. The PCM uses both inputs to determine the actual camshaft position.
 
Check the following items:

A loose CMP sensor causing a variance in the sensor signal
 
A loose CKP sensor causing a variance in the sensor signal
 
Excessive free play in the timing chain and gear assembly
 
Debris or contamination interfering with the camshaft position actuator solenoid valve assembly
 
Debris or contamination interfering with the camshaft position actuator assembly
 

Engine oil has a major impact upon the camshaft actuation systems responsiveness. Oil temperature, viscosity, and quality can slow and/or inhibit the phaser's ability to reach a desired phase angle.If an intermittent condition exists, refer to Intermittent Conditions .
 

Trouble Code: P0014



Exhaust Camshaft Position (CMP) System Performance

Trouble Code: P0017



Crankshaft Position (CKP) Exhaust - Camshaft Position (CMP) Correlation

Possible Causes:

Important: Scan tool control of the CMP actuator solenoid is inhibited when DTC P0017 sets. The following conditions may cause this DTC to set:



An improperly torqued crankshaft balancer
 
A mis-built or mis-timed engine
 
A loose or missing crankshaft balancer bolt
 
Excessive crankshaft endplay
 
The CMP actuator solenoid stuck open
 
The CMP actuator stuck in a position other than 0 degrees
 

Trouble Code: P0017



Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation

Possible Causes:

Important: The scan tool control of the CMP actuator is inhibited when DTC P0017 sets.



Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, crankshaft, or timing chain can cause this DTC to set.
 
Excessive crankshaft endplay can cause this DTC to set.
 

Trouble Code: P0030



HO2S Heater Control Circuit Sensor 1

Trouble Code: P0036



HO2S Heater Control Circuit Sensor 2

Trouble Code: P0053



HO2S Heater Resistance Sensor 1

Trouble Code: P0054



HO2S Heater Resistance Sensor 2

Trouble Code: P0068



Throttle Body Airflow Performance

Possible Causes:

Inspect for the following conditions:



The throttle blade for damage
 
A skewed cam sensor signal--Inspect for signals that are intermittently shorted to ground, causing a fluctuating RPM on the scan tool.
 

Trouble Code: P0101



Mass Air Flow (MAF) Sensor Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.
 
Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the PCM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 
A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 

Trouble Code: P0101



Mass Air Flow (MAF) Sensor Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 

Trouble Code: P0102



Mass Air Flow (MAF) Sensor Circuit Low Frequency

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s. A slightly greater resistance can cause the signal to cease. To pinpoint this condition perform a voltage drop test on the circuit.
 
Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 

Trouble Code: P0102



Mass Air Flow (MAF) Sensor Circuit Low Frequency

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 

Trouble Code: P0103



Mass Air Flow (MAF) Sensor Circuit High Frequency

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s. A slightly greater resistance can cause the signal to cease. To pinpoint this condition perform a voltage drop test on the circuit.
 
Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 

Trouble Code: P0103



Mass Air Flow (MAF) Sensor Circuit High Frequency

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 

Trouble Code: P0106



Manifold Absolute Pressure (MAP) Sensor Performance

Trouble Code: P0106



Manifold Absolute Pressure (MAP) Sensor Performance

Possible Causes:



A wide open throttle (WOT) acceleration from a stop should cause the MAP sensor parameter on the scan tool to increase rapidly to near the BARO Sensor parameter at the time of the 1-2 shift.
 
A skewed or stuck engine coolant temperature (ECT) sensor or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 

Trouble Code: P0106



Manifold Absolute Pressure (MAP) Sensor Performance

Possible Causes:



A wide open throttle (WOT) acceleration from a stop should cause the MAP sensor parameter on the scan tool to increase rapidly to near the BARO Sensor parameter at the time of the 1-2 shift.
 
The barometric pressure (BARO) that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is running, the ECM will continually update the BARO value near WOT using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.
 

Trouble Code: P0107



Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

Trouble Code: P0108



Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

Trouble Code: P0112



Intake Air Temperature (IAT) Sensor Circuit Low Voltage

Trouble Code: P0113



IAT Sensor Circuit High Voltage

Trouble Code: P0113



Intake Air Temperature (IAT) Sensor Circuit High Voltage

Possible Causes:



If the engine is cold, then at ignition ON, a properly functioning IAT sensor will gradually increase the scan tool IAT Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
 
Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
 

Trouble Code: P0116



Engine Coolant Temperature (ECT) Sensor Performance

Trouble Code: P0116



Engine Coolant Temperature (ECT) Sensor Performance

Possible Causes:



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 Versus Resistance table.
 
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

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

Trouble Code: P0122



Throttle Position (TP) Sensor 1 Circuit Low Voltage

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:



DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.
 
Corrosion in the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
 
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.
 

 
label.common.footer.alt.autozoneLogo