Silverado 2008

5.3L V8 VIN J Auto 15

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Trouble Code: P0342



CMP Sensor Circuit Low Input

Possible Causes:



Camshaft reluctor wheel is damaged or foreign material present
 
CMP sensor signal circuit is open, shorted to ground or VREF
 
CMP sensor is contacting the reluctor wheel or is damaged
 
ECM has failed
 

Trouble Code: P0343



CMP Sensor Circuit High Input

Possible Causes:



CMP sensor connector is damaged, loose or shorted
 
CMP sensor low reference circuit is open or shorted to VREF
 
Camshaft reluctor wheel is damaged or foreign material present
 
CMP sensor is contacting the reluctor wheel or is damaged
 
ECM has failed
 

Trouble Code: P0346



Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0347



Intake Camshaft Position (CMP) Sensor Circuit High Voltage (Bank 2)

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0348



Ignition Coil 1 Control Circuit

Possible Causes:



Ignition coil
 
ECM has failed
 

Trouble Code: P0351



Ignition Coil 1 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 1 is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0351



Ignition Coil 1 Control Circuit

Possible Causes:



Ignition coil
 
ECM has failed
 

Trouble Code: P0352



Ignition Coil 2 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 2 is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0352



Ignition Coil 2 Control Circuit Malfunction

Possible Causes:



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

Trouble Code: P0353



Ignition Coil 3 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 3 is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0353



Ignition Coil 3 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: P0354



Ignition Coil 4 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 4 is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0354



Ignition Coil 4 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, or the ECM has failed
 

Trouble Code: P0355



Ignition Coil 5 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 5 is damaged or it has failed
 
ECM has failed
 

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 (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 6 is damaged or it 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 (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 8 is damaged or it has failed
 
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: P0366



Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage (Bank 1)

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0367



Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage (Bank 1)

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0368



Exhaust Camshaft Position (CMP) Sensor Performance (Bank 2)

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0391



Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage (Bank 2)

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0392



Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage (Bank 2)

Possible Causes:



Low reference circuit for an open/high resistance or for a short to voltage
 
5 volt reference circuit for an open/high resistance
 
Short to voltage in the signal circuit
 
Short to ground or an open/high resistance in the signal circuit.
 
CMP has failed
 
ECM has failed
 

Trouble Code: P0393



Insufficient EGR Flow Detected

Possible Causes:



Base engine problem (e.g., a severely restricted exhaust)
 
EGR vacuum hoses damaged, loose or routed incorrectly
 
EGR passages or intake passages clogged or restricted
 
EGR solenoid valve is clogged (carbon), damaged or has failed
 
TSB 87-65-22 contains a repair procedure for this code
 

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: P0411



Secondary Air Injection (AIR) System Incorrect Air Flow Detected

Possible Causes:



AIR pump relay has failed
 
AIR pump has failed
 
AIR solenoid relay has failed
 
AIR solenoid valve has failed
 
Test or inspect the AIR solenoid valve outlet pipe and exhaust manifold for a restriction
 
Air injection check valve
 

Trouble Code: P0412



Secondary Air Injection (AIR) Solenoid Control Circuit

Possible Causes:



AIR pump relay has failed
 
AIR pump has failed
 
AIR solenoid relay has failed
 
AIR solenoid valve has failed
 
Test or inspect the AIR solenoid valve outlet pipe and exhaust manifold for a restriction
 
Air injection check valve
 

Trouble Code: P0418



Secondary Air Injection (AIR) Pump Control Circuit

Possible Causes:



AIR pump relay has failed
 
AIR pump has failed
 
AIR solenoid relay has failed
 
AIR solenoid valve has failed
 
Test or inspect the AIR solenoid valve outlet pipe and exhaust manifold for a restriction
 
Air injection check valve
 

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 Bank 1 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)
 

 
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