Malibu, Malibu MAXX 2006-2008

3.6L V6 VIN 7 Auto 3

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Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only Cylinder 4
 
Fuel delivery component fault that affects only Cylinder 4 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only Cylinder 5
 
Fuel delivery component fault that affects only Cylinder 5 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only Cylinder 6
 
Fuel delivery component fault that affects only Cylinder 6 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 6
 

Trouble Code: P0327



Knock Sensor Circuit Low Input (Bank 1)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (check for proper torque)
 
Knock sensor is damaged or has failed
 
ECM has failed
 

Trouble Code: P0328



Knock Sensor Circuit Low Input (Bank 1)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (check for proper torque)
 
Knock sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0331



Knock Sensor (KS) Circuit Low Voltage (Bank 2)

Possible Causes:



KS circuits A and B for a short to ground or an open/high resistance
 
KS circuits A and B for a short to voltage
 
KS sensor has failed
 
ECM has failed
 

Trouble Code: P0332



Knock Sensor Circuit Malfunction (Bank 2)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (i.e., not mounted properly)
 
Knock sensor is damaged or has failed
 
On modules with an integrated sensor, clear the codes and retest for codes. If the same code resets, the ECM has failed.
 

Trouble Code: P0333



Crankshaft Position (CKP) Sensor Circuit

Possible Causes:



CKP sensor low reference circuit for an open/high resistance
 
CKP sensor 5-volt reference circuit for an open/high resistance or short to ground
 
CKP sensor 5-volt reference circuit for a short to voltage
 
CKP sensor signal circuit for an open/high resistance or short to ground
 
CKP sensor signal circuit for a short to voltage
 
CKP sensor has failed
 
ECM has failed
 

Trouble Code: P0335



CKP Sensor Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor ground (low reference) circuit is open
 
CKP sensor power circuit is open between sensor and the ECM
 
Crankshaft reluctor wheel is damaged or improper installation
 
ECM has failed
 

Trouble Code: P0336



Crankshaft Reference 24X Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor ground (Low Reference) circuit is open
 
CKP sensor is damaged or it failed (check crankshaft reluctor)
 
ECM has failed
 

Trouble Code: P0338



Camshaft Position (CMP) Sensor Circuit

Possible Causes:



CMP sensor 5-volt reference circuit for an open/high resistance or short to ground
 
CMP sensor 5-volt reference circuit for a short to voltage
 
CMP sensor signal circuit for an open/high resistance or short to ground
 
CMP sensor signal circuit for a short to voltage
 
CKP sensor has failed
 
ECM has failed
 

Trouble Code: P0341



Intake Camshaft Position (CMP) Sensor Performance

Possible Causes:



Camshaft reluctor wheel for damage
 
Timing chain, tensioner, and sprockets for wear or damage.
 
CMP has failed
 
ECM has failed
 

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

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
 
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 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 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 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: 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: 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: P0420



Catalyst System Low Efficiency (Bank 1)

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)
 
TSB 81-65-37 contains a repair procedure for this code
 

Trouble Code: P0430



Catalyst System Low Efficiency (Bank 2)

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)
 

Trouble Code: P0442



Evaporative Emission (EVAP) System Small Leak Detected

Possible Causes:



Damaged EVAP purge solenoid
 
Damaged EVAP vent valve or EVAP canister
 
Incorrectly routed, kinked, or damaged EVAP pipes and hoses
 

Trouble Code: P0442



Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Possible Causes:



EVAP canister purge or vent solenoid valve voltage supply circuit for a short to ground or an open/high resistance
 
EVAP canister purge or vent solenoid valve control circuit for a short to ground
 
EVAP canister purge or vent solenoid valve control circuit for a short to voltage or an open/high resistance
 
EVAP canister purge or vent solenoid valve
 
ECM has failed
 

Trouble Code: P0443



EVAP Purge Solenoid Control Circuit Malfunction

Possible Causes:



Purge solenoid control circuit is open or shorted to ground
 
Purge solenoid control circuit is shorted to system power (B+)
 
Purge solenoid power circuit is open (test the ENG1 fuse)
 
Purge solenoid is damaged or has failed
 
ECM has failed
 

Trouble Code: P0446



Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Possible Causes:



EVAP canister purge or vent solenoid valve voltage supply circuit for a short to ground or an open/high resistance
 
EVAP canister purge or vent solenoid valve control circuit for a short to ground
 
EVAP canister purge or vent solenoid valve control circuit for a short to voltage or an open/high resistance
 
EVAP canister purge or vent solenoid valve
 
ECM has failed
 

Trouble Code: P0449



Fuel Tank Pressure (FTP) Sensor Circuit

Possible Causes:



EVAP purge solenoid valve
 
FTP sensor
 
EVAP canister vent solenoid valve and vent pipe for a blockage or restriction
 

Trouble Code: P0450



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:



FTP sensor low reference circuit for an open/high resistance
 
FTP sensor 5-volt reference circuit for a short to ground or an open/high resistance.
 
FTP sensor 5-volt reference circuit for a short to voltage
 
FTP sensor signal circuit for short to ground or an open/high resistance
 
FTP sensor has failed
 
ECM has failed
 

 
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