Cobalt 2006-2008, G5 2007

2.0L L4 VIN X Std 2

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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: P0313



Crankshaft Position (CKP) System Variation Not Learned

Possible Causes:



Any worn crankshaft main bearings
 
Damaged or misaligned reluctor wheel
 
Excessive crankshaft runout
 
A damaged crankshaft
 
Interference in the signal circuit of the CKP sensor
 
Ignition switch is left in the ON position, until the battery is discharged
 
ECM power disconnect, with the ignition ON, that may have erased the * CKP system variation values
 
Debris between the CKP sensor and the reluctor wheel
 
CKP System lost Variation Learn Procedure
 
ECM has failed
 

Trouble Code: P0325



Knock Sensor Circuit Malfunction

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (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: P0326



Knock Sensor (KS) Circuit Low Voltage (Bank 1)

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: P0335



Crankshaft Position Sensor Circuit Malfunction

Possible Causes:



CKP sensor signal (+) circuit or (-) circuit is open or shorted to ground
 
CKP sensor is damaged or has failed
 
ECM has failed
 

Trouble Code: P0336



Crankshaft Reference 18X Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor VREF circuit is open, or the ground (Low Reference) circuit is open
 
CKP sensor is damaged or it failed (check the crankshaft reluctor)
 
CKP sensor wiring routed close to spark plug wires (EMI/RFI)
 
ECM has failed
 

Trouble Code: P0340



CMP Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or shorted to VREF between the sensor and the ECM
 
CMP sensor VREF circuit is open between sensor and ECM
 
CMP sensor ground circuit or "shielded" ground circuit is open
 
CMP sensor is cracked or damaged (check the reluctor wheel)
 
ECM has failed
 

Trouble Code: P0341



CMP Sensor Signal Range/Performance

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or VREF
 
CMP sensor signal wire is routed to close to the Generator, spark plug wires or any other possible cause of EMI/RFI under the hood (check for high power receivers causing interference)
 
CMP sensor "shield" ground circuit is open (intermittent fault)
 
CMP sensor is cracked or damaged (check the reluctor wheel)
 
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
 
Ignition coil (COP) is damaged or 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 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: P0365



Exhaust Camshaft Position (CMP) Sensor Performance

Possible Causes:



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

Trouble Code: P0366



Exhaust Camshaft Position (CMP) Sensor Performance (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: 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)
 
Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy)
 

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: 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 IGN1 fuse)
 
Purge solenoid is damaged or has failed
 
ECM has failed
 

Trouble Code: P0446



Evaporative Emissions (EVAP) Vent System Performance

Possible Causes:



EVAP vent fresh air hose is clogged, kinked or restricted
 
EVAP Vent solenoid is contaminated, damaged or has failed
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
ECM has failed
 

Trouble Code: P0449



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



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

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:



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

Trouble Code: P0454



Evaporative Emission (EVAP) System Large Leak Detected

Possible Causes:



Inspect for a damaged fuel filler neck seal surface.
 
Blockage or restriction in the EVAP purge solenoid valve, purge pipe, EVAP canister, or vapor pipe,
 
Inspect for a loose, missing, damaged, or incorrect fuel fill cap
 
FTP sensor has failed
 

Trouble Code: P0455



Evaporative Emissions (EVAP) System Very 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: P0456



Evaporative Emission (EVAP) Purge Solenoid Control Circuit Low Voltage

Possible Causes:



EVAP purge solenoid control circuit for a shorted to ground.
 
EVAP purge solenoid shorted to voltage or an open/high resistance
 
Faulty EVAP purge solenoid.
 
ECM has failed
 

Trouble Code: P0458



Evaporative Emission (EVAP) Purge Solenoid Control Circuit High Voltage

Possible Causes:



EVAP purge solenoid control circuit for a shorted to ground.
 
EVAP purge solenoid shorted to voltage or an open/high resistance
 
Faulty EVAP purge solenoid.
 
ECM has failed
 

Trouble Code: P0459



Fuel Level Sensor High Input

Possible Causes:



Fuel level sensor signal circuit is shorted to system power
 
Fuel level sensor ground circuit is open
 
Fuel level sender is damaged, binding or not aligned properly
 
ECM has failed
 

Trouble Code: P0496



Evaporative Emission (EVAP) System No Flow During Purge

Possible Causes:



Fuel filler cap is very loose, missing or the wrong part
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank pressure sensor is damaged, disconnected or it failed
 
Fuel tank vapor line(s) is clogged, damaged or disconnected
 
Purge valve vapor line is clogged, damaged, or disconnected
 
Purge solenoid is not opening (it may be damaged or sticking)
 
Vent solenoid is not closing (it may be damaged or sticking)
 
ECM has failed
 

Trouble Code: P0498



Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit High Voltage

Possible Causes:



Vent solenoid control circuit is open or shorted to ground
 
Vent solenoid control circuit is shorted to system power (B+)
 
Vent solenoid power circuit is open
 
Vent solenoid is damaged or has failed
 
ECM has failed
 

Trouble Code: P0499



Vehicle Speed Sensor Circuit Malfunction

Possible Causes:



Output shaft rotor is chipped or damaged
 
Output shaft rotor is not aligned properly with the VSS unit
 
VSS tip contains debris or metal shavings (an intermittent fault)
 
VSS positive (+) signal circuit is open or shorted to ground
 
VSS negative (-) signal circuit is open or shorted to ground
 
VSS is damaged or has failed
 

Trouble Code: P0507



Idle Speed Too High

Possible Causes:



Air inlet duct is collapsed, loose or air filter element is clogged
 
A parasitic load on the engine
 
Base engine problem (i.e., compression or misfire condition)
 
MAF sensor is dirty, out-of-calibration or it is "skewed"
 
Throttle plate, throttle shaft or linkage is damaged or sticking
 
ECM has failed
 

Trouble Code: P0508



Cold Start Idle Air Control System Performance

Possible Causes:



Faulty Positive Crankcase Ventilation (PCV) system
 
Vacuum leaks
 
Mechanical conditions that limit engine speed
 
Restricted exhaust
 
Excessive deposits in the throttle body
 
Accessories that require additional torque to operate
 

Trouble Code: P050A



Cold Start Idle Air Control (IAC) System Performance

Possible Causes:



Air inlet duct is collapsed, loose or air filter element is clogged
 
A parasitic load on the engine
 
Base engine problem (i.e., compression or misfire condition)
 
MAF sensor is dirty, out-of-calibration or it is "skewed"
 
Throttle plate, throttle shaft or linkage is damaged or sticking
 
ECM has failed
 

Trouble Code: P0601



Control Module Torque Performance

Possible Causes:



Voltage and ground inputs to the ECM
 
High resistance, short or open condition to the ECM
 
ECM is not properly programmed
 
ECM has failed
 

Trouble Code: P0601A



Control Module Torque Calculation Performance

Possible Causes:



Voltage and ground inputs to the ECM
 
High resistance, short or open condition to the ECM
 
ECM is not properly programmed
 
ECM has failed
 

Trouble Code: P0601B



Control Module Engine Speed Performance

Possible Causes:



Voltage and ground inputs to the ECM
 
High resistance, short or open condition to the ECM
 
ECM is not properly programmed
 
ECM has failed
 

Trouble Code: P0601C



Control Module Not Programmed

Possible Causes:



Check the voltage and ground inputs to the ECM for a, short, open or high resistance
 
ECM has failed
 

Trouble Code: P0602



Control Module Long Term Memory Reset

Possible Causes:



Check the voltage and ground inputs to the ECM for a, short, open or high resistance
 
ECM has failed
 

Trouble Code: P0603



Control Module Random Access Memory (RAM)

Possible Causes:



Check the voltage and ground inputs to the ECM for a, short, open or high resistance
 
ECM has failed
 

Trouble Code: P0604



Control Module Programming Read Only Memory (ROM)

Possible Causes:



The ECM must be replaced to correct this problem. A new ECM must be programmed with the correct software/calibration.
 

Trouble Code: P0606



Control Module Performance

Possible Causes:



Check the voltage and ground inputs to the ECM for a, short, open or high resistance
 
ECM has failed
 

 
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