Silverado 2008

6.0L V8 VIN Y Auto 14

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Trouble Code: P0340



Camshaft Position Sensor Circuit

Possible Causes:



Note: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by sensing crankshaft position sensor pulses.
 
The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 s without a camshaft position sensor pulse.
 
The ECM detects that the engine has started, but did not receive a camshaft position sensor pulse during the first engine revolution.
 
The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1000 engine cycles.
 

Trouble Code: P0340



Camshaft Position Sensor Circuit

Possible Causes:



The ECM detects that the starter is commanded on and the engine has been cranking for greater than 4 s without a camshaft position sensor pulse.
 
The ECM detects that the engine has started, but did not receive a camshaft position sensor pulse during the first engine revolution.
 
The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1000 engine cycles.
 

Trouble Code: P0340



Camshaft Position (CMP) Sensor Circuit

Possible Causes:



The ECM does not see a CMP sensor signal for more than 2 seconds.
 

Trouble Code: P0341



Camshaft Position Sensor Performance

Possible Causes:



Important: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by sensing crankshaft position sensor pulses.
 
The ECM detects that the engine was started, but has received less than 2 or more than 8 camshaft position sensor pulses during the first engine resolution.
 
The ECM detects that the engine has started and is running, but receives less than 398 or more than 402 camshaft position pulses per 100 engine cycles in 800 of 1000 engine cycles.
 

Trouble Code: P0341



Camshaft Position Sensor Performance

Possible Causes:



Important: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by sensing crankshaft position sensor pulses.
 
The ECM detects that the engine has started, but has received less than 2, or more than 8, camshaft position sensor pulses during the first engine revolution.
 
The ECM detects that the engine has started and is running, but receives less than 398, or more than 402 camshaft position pulses per 100 engine cycles in 800 of 1,000 engine cycles.
 

Trouble Code: P0341



Camshaft Position (CMP) Sensor Performance

Possible Causes:



The ECM determines that the CMP sensor signal is out of range.
 

Trouble Code: P0355



Ignition Coil 5 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power between the coil and the ECM
 
Ignition coil (COP) is damaged or has failed
 
ECM has failed
 

Trouble Code: P0356



Ignition Coil 6 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power between the coil and the ECM
 
Ignition coil (COP) is damaged or has failed
 
ECM has failed
 

Trouble Code: P0357



Ignition Coil 8 Control Circuit

Possible Causes:



Ignition coil
 
ECM has failed
 

Trouble Code: P0358



Ignition Coil 8 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power between the coil and the ECM
 
Ignition coil (COP) is damaged or has failed
 
ECM has failed
 

Trouble Code: P0401



Exhaust Gas Recirculation (EGR) Flow Insufficient

Possible Causes:



P0401
 
The ECM detects that the difference between the actual mass air flow and the desired mass air flow is less than a calibrated value for greater than 15 seconds when the EGR is active.
 

Trouble Code: P0402



Exhaust Gas Recirculation (EGR) Flow Excessive

Possible Causes:



P0402
 
The ECM detects that the difference between the actual mass air flow and the desired mass air flow is greater than a calibrated value for greater than 15 seconds when the EGR is active.
 

Trouble Code: P0403



Exhaust Gas Recirculation (EGR) Solenoid Control Circuit

Possible Causes:



P0403
 
The ECM detects an electrical malfunction on an EGR motor control circuit.
 
The above condition is present for more than 4 seconds.
 

Trouble Code: P0405



Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage

Possible Causes:



P0405
 
The EGR position sensor voltage is less than 0.26 volt for more than 3 seconds.
 

Trouble Code: P0406



Exhaust Gas Recirculation (EGR) Position Sensor Circuit High Voltage

Possible Causes:



P0406
 
The EGR position sensor voltage is more than 4.75 volt for more than 3 seconds.
 

Trouble Code: P040C



Exhaust Gas Recirculation (EGR) Temperature Sensor 1 Circuit Low Voltage

Possible Causes:



P040C
 
The ECM detects that the EGR temperature sensor is less than 0.26 volts for 3 seconds or longer.
 

Trouble Code: P040D



Exhaust Gas Recirculation (EGR) Temperature Sensor 1 Circuit High Voltage

Possible Causes:



P040D
 
The ECM detects that the EGR temperature sensor is greater than 4.9 volts for 3 seconds or longer.
 

Trouble Code: P040F



Exhaust Gas Recirculation (EGR) Temperature Sensor 1-2 Correlation

Possible Causes:



DTCs P040C, P040D, P041C or P041D are not set.
 
The ECM detects a temperature difference of between 32-99°C (89.6-210.2°F) between EGR temperature sensors 1 and 2 for 3 seconds or longer.
 
This DTC runs once per key cycle when the above conditions are met.
 
OR
 
DTCs P040C, P040D, P041C, or P041D are not set.
 
The ECM detects a temperature difference of greater than 99°C (210.2°F) between EGR temperature sensors 1 and 2.
 
The vehicle is driven greater than 25 mph (40.2 kph) for greater than 10 minutes.
 
This DTC runs once per key cycle when the above conditions are met.
 

Trouble Code: P041C



Exhaust Gas Recirculation (EGR) Temperature Sensor 2 Circuit Low Voltage

Possible Causes:



P041C
 
The ECM detects that the EGR temperature sensor is less than 0.26 volt for 3 seconds or longer.
 

Trouble Code: P041D



Exhaust Gas Recirculation (EGR) Temperature Sensor 2 Circuit High Voltage

Possible Causes:



P041D
 
The ECM detects that the EGR temperature sensor is greater than 4.9 volts for 3 seconds or longer.
 

Trouble Code: P0420



Catalyst System Low Efficiency Bank 1

Possible Causes:



The ECM has determined the catalyst efficiency has degraded below a calibrated threshold.
 
This diagnostic may conclude in one test attempt. However, this diagnostic may require as many as 18 test attempts, which would require at least 3 drive cycles. Each test attempt may conclude within approximately 1 minute.
 

Trouble Code: P0420



Catalyst System Low Efficiency

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Base engine problems (i.e., high engine oil or coolant usage)
 
Catalytic converter is damaged, contaminated or has failed
 
Continuous engine misfire conditions, or weak or low coil output
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Rear HO2S is loose in the mounting hole (check it for a leak)
 
Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy)
 

Trouble Code: P0430



Catalyst System Low Efficiency Bank 2

Possible Causes:



The ECM has determined the catalyst efficiency has degraded below a calibrated threshold.
 
This diagnostic may conclude in one test attempt. However, this diagnostic may require as many as 18 test attempts, which would require at least 3 drive cycles. Each test attempt may conclude within approximately 1 minute.
 

Trouble Code: P0442



Evaporative Emission (EVAP) System Small Leak Detected

Possible Causes:



The ECM detects a leak in the EVAP system that is greater than a calibrated amount.
 
The ECM must complete several EONV tests before the diagnostic can turn the MIL on or off.
 

Trouble Code: P0443



Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Possible Causes:



The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 5 seconds.
 

Trouble Code: P0446



Evaporative Emissions (EVAP) Vent System Performance

Possible Causes:



The fuel tank vacuum is greater than 12 inches H2O vacuum for 5 seconds.
 
OR
 
The FTP is less than -2.5 inches H2O or more than +5 inches for 60 seconds after a cold start.
 

Trouble Code: P0449



Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Possible Causes:



The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 5 seconds.
 

Trouble Code: P0454



Fuel Tank Pressure (FTP) Sensor Intermittent

Possible Causes:



P0454
 
If, during the engine-off natural vacuum small leak test, P0442, the ECM detects an abrupt FTP signal change, other than a refueling event, this DTC will set. An abrupt change is defined as a change of 0.45 inch H2O in the span of 1 second.
 

Trouble Code: P046C



Exhaust Gas Recirculation (EGR) Position Sensor Performance

Possible Causes:



P046C
 
The difference between the actual EGR position and the desired EGR position is more than 3 percent.
 
The above condition is present for more than 10 seconds.
 

Trouble Code: P0496



Evaporative Emission System Flow During Non-Purge

Possible Causes:



The ECM detects greater than 10 inch H2O (2.49 kPa) vacuum for 5 seconds during a non-purge condition.
 

Trouble Code: P0496



Evaporative Emission System Flow During Non-Purge

Possible Causes:



The ECM detects more than 10 inch H2O vacuum for 5 seconds during a non-purge condition.
 

Trouble Code: P0502



Vehicle Speed Sensor (VSS) Absence of Signal

Possible Causes:



The difference between the two output speed signals is greater than 8 km/h (5 mph) for more than 1 second.
 

Trouble Code: P0502



Vehicle Speed Sensor (VSS) Circuit Low Voltage

Possible Causes:



P0502
 
The transmission output speed is 58 RPM or less for 5 seconds.
 

Trouble Code: P0503



Vehicle Speed Sensor (VSS) Circuit Intermittent

Possible Causes:



P0503
 
The transmission output speed drops 351 RPMs in less than 3 seconds.
 

Trouble Code: P0506



Idle Speed Low

Possible Causes:



P0506
 
The actual idle speed is approximately 90 RPM lower than the desired idle speed.
 

Trouble Code: P0506



Idle Speed Low

Possible Causes:



P0506
 
The ECM detects the actual idle speed is at least 100 RPM below the desired idle speed for greater than 19 seconds.
 

Trouble Code: P0507



Idle Speed High

Possible Causes:



P0507
 
The actual idle speed is approximately 180 RPM greater than the desired idle speed.
 

Trouble Code: P0507



Idle Speed High

Possible Causes:



P0507
 
The ECM detects the actual idle speed is at least 200 RPM above the desired idle speed for greater than 19 seconds.
 

Trouble Code: P0545



Exhaust Temperature Sensor 1 (EGT-1) Circuit Low Voltage

Possible Causes:



P0545
 
The ECM detects that the EGT sensor is less than 0.32V for greater than 1 second.
 

Trouble Code: P0546



Exhaust Temperature Sensor 1 (EGT-1) Circuit High Voltage

Possible Causes:



P0546
 
The ECM detects that the EGT sensor is greater than 3.37V for greater than 1 second.
 

 
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