Sierra, Silverado 2006-2007

5.3L V8 VIN M Auto 1

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5.3L V8 VIN M Auto

Trouble Code: C0235



Rear Wheel Speed Signal Circuit Open

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: C0236



Rear Wheel Speed Signal Missing

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: C0237



Rear Wheel Speed Signal Erratic

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: C0287



Delivered Torque Signal Malfunction

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: C0298



Powertrain Control Malfunction

Possible Causes:

C0298 A requested torque signal malfunction is only one possible cause for the PCM to lose the ability to perform traction control. DTC C0298 may set due to engine overheating, throttle actuator control failure, loss of ignition timing control by the PCM, etc. If DTC P0856 has not set, refer to the following in order to identify other possible causes of DTC C0298:



Symptoms - Engine Controls for the 4.3L engine
 
Symptoms - Engine Controls for the 8.1L engine
 
Symptoms - Engine Controls for the 4.8L, 5.3L, and 6.0L engines
 
Symptoms - Engine Controls for the 6.6L (LBZ and LLY) engine
 



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

Trouble Code: P0030



HO2S Heater Control Circuit Bank 1 Sensor 1

Trouble Code: P0036



HO2S Heater Control Circuit Bank 1 Sensor 2

Trouble Code: P003A



Turbocharger Boost Control Position Not Learned

Possible Causes:



If there is a loss of ignition voltage to ECM terminal C1-76 this DTC may set. Verify this circuit is not shorted to ground or open. Verify the supply fuse for this circuit is not open.
 
If any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. Failure to perform the turbocharger learn procedure may cause other DTCs to set. Refer to Turbocharger Learn .
 

Trouble Code: P0045



Turbocharger Boost Control Solenoid Control Circuit

Possible Causes:



If there is a loss of ignition voltage to terminal C1-76 at the ECM this DTC may set. Verify the circuit is not shorted to ground, open, or has an open supply fuse.
 
Engine running, increase the engine speed to 1,500 RPM and maintain. With a scan tool, command the TC Vane Pos. Ctrl. Solenoid ON and OFF. The TC Vane Position Sensor parameter should increase to 95-97 percent when the TC solenoid is commanded ON and decrease to near 0 percent when commanded OFF.
 

Trouble Code: P0050



HO2S Heater Control Circuit Bank 2 Sensor 1

Trouble Code: P0053



HO2S Heater Resistance Bank 1 Sensor 1

Trouble Code: P0054



HO2S Heater Resistance Bank 1 Sensor 2

Trouble Code: P0056



HO2S Heater Control Circuit Bank 2 Sensor 2

Trouble Code: P0059



HO2S Heater Resistance Bank 2 Sensor 1

Trouble Code: P0060



HO2S Heater Resistance Bank 2 Sensor 2

Trouble Code: P0068



Throttle Body Airflow Performance

Possible Causes:



Inspect the throttle blade for being broken, bent, or missing.
 
Inspect the TP sensor for proper installation. A sensor that is misaligned could set this DTC.
 
Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
Physically and visually inspect the throttle body assembly and correct any problems that you observe. Manually move the throttle blade from closed to wide open throttle (WOT). You should not need to use excess force. The throttle blade should move smoothly through the full range, then should independently return to a slightly open position.
 
When the TAC module detects a condition within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0087



Fuel Rail Pressure (FRP) Too Low

Possible Causes:

P0087



Gasoline contamination of the fuel may cause this DTC to set. Refer to Contaminants-in-Fuel Diagnosis .
 
When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank.
 
When power enhancing devices have been attached to the fuel rail pressure sensor circuits, this DTC may set and adversely effect the fuel system components.
 
If the fuel pressure valve is not torqued correctly, the valve will leak fuel into the fuel return system causing this DTC to set. The fuel pressure relief valve uses a bite type seal, and proper torque is essential for valve to rail sealing. Refer to Fastener Tightening Specifications .
 
A sticking FRP regulator may cause this DTC to set.
 
High fuel injector return flow may cause this DTC to set.
 
The addition of fuel system enhancements, such as auxiliary fuel tanks or add on fuel filters may relate to driveability complaints.
 



Driveability concerns may not occur with this DTC present.
 
If the fuel system pressure is actually too high, a fuel knock and smoke condition will exist.
 
A sticking FRP regulator may cause this DTC to set.
 

Trouble Code: P0088



Fuel Rail Pressure (FRP) Too High

Possible Causes:

P0087



Gasoline contamination of the fuel may cause this DTC to set. Refer to Contaminants-in-Fuel Diagnosis .
 
When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank.
 
When power enhancing devices have been attached to the fuel rail pressure sensor circuits, this DTC may set and adversely effect the fuel system components.
 
If the fuel pressure valve is not torqued correctly, the valve will leak fuel into the fuel return system causing this DTC to set. The fuel pressure relief valve uses a bite type seal, and proper torque is essential for valve to rail sealing. Refer to Fastener Tightening Specifications .
 
A sticking FRP regulator may cause this DTC to set.
 
High fuel injector return flow may cause this DTC to set.
 
The addition of fuel system enhancements, such as auxiliary fuel tanks or add on fuel filters may relate to driveability complaints.
 



Driveability concerns may not occur with this DTC present.
 
If the fuel system pressure is actually too high, a fuel knock and smoke condition will exist.
 
A sticking FRP regulator may cause this DTC to set.
 

Trouble Code: P0090



Fuel Pressure Regulator Control Circuit

Possible Causes:



There are no driveability concerns associated with the FRP regulator unless a DTC is present. The most likely cause of this DTC is a sticking FRP regulator.
 
If the fuel system pressure is actually too high, a fuel knock and smoke condition will exist.
 
If the fuse that supplies voltage to terminal C1-76 of the ECM is open, this DTC will set.
 

Trouble Code: P0097



Intake Air Temperature (IAT) Sensor 2 Circuit Low Voltage

Trouble Code: P0098



Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage

Trouble Code: P0101



Mass Air Flow (MAF) Sensor Performance

Possible Causes:



Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:

The secondary ignition wires or coils
 
Any solenoids
 
Any relays
 
Any motors
 

A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for any vacuum leak downstream of the MAF sensor.Inspect for any contamination or debris on the sensing elements of the MAF sensor.Inspect the air induction system for any water intrusion. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 3-10 g/s at idle to 170 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.The barometric pressure (BARO) that is used to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running the BARO value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. The value shown for the MAP sensor parameter varies with the altitude. With the ignition ON and the engine OFF, 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.A high resistance on the 5-volt reference circuit of the MAP sensor may cause this DTC to set.A high resistance on the low reference circuit of the MAP sensor may cause this DTC to set.If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0102



Mass Air Flow (MAF) Sensor Circuit Low Frequency

Possible Causes:



Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:

The secondary ignition wires or coils
 
Any solenoids
 
Any relays
 
Any motors
 

A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for any vacuum leak downstream of the MAF sensor.Inspect for any contamination or debris on the sensing elements of the MAF sensor.A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 3-10 g/s at idle to 170 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.A high resistance of 15 ohms or more on the ground circuit of the MAF sensor may cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.A high resistance of 15 ohms or more on the ignition 1 voltage circuit can cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0103



Mass Air Flow (MAF) Sensor Circuit High Frequency

Possible Causes:



Inspect the air induction system for any water intrusion. The water rapidly cools the hot sensing elements in the sensor causing a false indication of excessive airflow. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.
 
A poor connection in the ignition 1 voltage circuit of the MAF sensor may cause this DTC to set.
 

Trouble Code: P0106



Manifold Absolute Pressure (MAP) Sensor Performance

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

Possible Causes:



When the vehicle is at ambient temperature the IAT sensor and the ECT sensor temperatures should be relatively close to each other. Refer to Temperature vs Resistance .
 
If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0113



Intake Air Temperature (IAT) Sensor Circuit High Voltage

Possible Causes:



When the vehicle is at ambient temperature the IAT sensor and the ECT sensor temperatures should be relatively close to each other. Refer to Temperature vs Resistance .
 
If a short to a separate 5-volt source occurs this DTC may set.
 
If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0116



Engine Coolant Temperature (ECT) Sensor Performance

Possible Causes:



DTC P0116 may set if the vehicle uses an aftermarket engine block heater.
 

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 an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

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 in order 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: P0120



Throttle Position (TP) Sensor 1 Circuit

Possible Causes:



Inspect the TAC module connectors for signs of water intrusion. When this occurs, multiple DTCs could be set with no circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the stored information, Capture Info.
 
If this DTC is determined to be intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0128



Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

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 Performance Bank 1 Sensor 2

 
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