CTS 2003-2005

3.2L V6 VIN N Auto 3

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Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 4
 
Check throttle body and intake manifold for any vacuum leaks
 
Fuel metering problem that affects only Cylinder 4
 
Ignition system fault (coil, plug) that affects only Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 5
 
Check throttle body and intake manifold for any vacuum leaks
 
Fuel metering problem that affects only Cylinder 5
 
Ignition system fault (coil, plug) that affects only Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 6
 
Check throttle body and intake manifold for any vacuum leaks
 
Fuel metering problem that affects only Cylinder 6
 
Ignition system fault (coil, plug) that affects only Cylinder 6
 

Trouble Code: P0313



Misfire Detected, Lean Air Fuel Condition Present

Possible Causes:



Verify that there is an adequate fuel supply in the fuel tank
 
If this code is set and a misfire or lean condition is not currently present, the vehicle has run low on fuel and caused this code.
 

Trouble Code: P0318



Misfire Detected, Lean Air Fuel Condition Present

Possible Causes:



Perform the Diagnostic Circuit Check for the PCM
 
Perform the Diagnostic Circuit Check for the EBCM
 
Check the serial data connections to the EBCM and the PCM
 

Trouble Code: P0324



Knock Sensor Circuit Malfunction

Possible Causes:



Clear the codes and then recheck for the same code to reset.
 
PCM has failed
 

Trouble Code: P0327



Knock Sensor 1 Circuit Low Input (Bank 1)

Possible Causes:



Knock sensor connector is damaged or shorted
 
Knock sensor signal circuit is shorted to ground
 
Knock sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0328



Knock Sensor 2 Circuit Low Input (Bank 2)

Possible Causes:



Knock Sensor 2 connector is damaged or open
 
Knock Sensor 2 circuit is shorted to ground
 
Knock Sensor 2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0332



Knock Sensor 1 Circuit Low Input (Bank 1)

Possible Causes:



Knock Sensor 1 connector is damaged, open or shorted
 
Knock Sensor 1 signal circuit is shorted to ground
 
Knock Sensor 1 is damaged, open or shorted to ground
 
PCM has failed
 

Trouble Code: P0333



Knock Sensor 2 Circuit High Input (Bank 2)

Possible Causes:



Knock Sensor 2 connector is damaged or shorted
 
Knock Sensor 2 circuit is shorted to system power
 
Knock Sensor 2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0335



Crankshaft Position Sensor Circuit Malfunction

Possible Causes:



CKP sensor connector is damaged, open or shorted
 
CKP sensor positive (+) circuit or (-) circuit is open or shorted to ground
 
CKP sensor is physically damaged or it is improperly installed
 
CKP sensor has failed
 
Electromagnetic interference in the CKP sensor circuits
 
Excessive air gap between the CKP sensor and reluctor ring
 
Foreign material lodged between CKP sensor and reluctor ring
 
PCM has failed
 

Trouble Code: P0336



Crankshaft Position Sensor Signal Range/Performance

Possible Causes:



CKP sensor wires routed close to other wiring or components
 
CKP sensor wires routed close to after-market add-on devices
 
CKP sensor wires routed close to solenoids, relays, and motors
 
CKP sensor is physically damaged or it is improperly installed
 
CKP sensor is damaged or it has failed
 
Electromagnetic interference in CKP sensor circuit (see above)
 
Excessive air gap between the CKP sensor and reluctor ring
 
Foreign material lodged between CKP sensor and reluctor ring.
 
PCM has failed
 

Trouble Code: P0337



Crankshaft Position Sensor Circuit Low Frequency

Possible Causes:



CKP sensor wires routed close to other wiring or components
 
CKP sensor positive (+) signal circuit is open
 
CKP sensor is damaged or it has failed
 
Excessive air gap between CKP sensor and reluctor ring, or material lodged in the ring
 
PCM has failed
 

Trouble Code: P0338



Crankshaft Position Sensor Circuit High Frequency

Possible Causes:



CKP sensor wires routed close to other wiring or components
 
CKP sensor resistance out of specification (700-1100 ohms)
 
CKP sensor is damaged or it has failed
 
Excessive air gap between the CKP sensor and reluctor ring
 
Foreign material lodged between CKP sensor and reluctor ring.
 
PCM has failed
 

Trouble Code: P0341



Camshaft Position Sensor Signal Range/Performance

Possible Causes:



CMP sensor wires routed close to other wiring or components
 
Camshaft reluctor wheel damage, incorrect sensor installation
 
CMP sensor is contacting the reluctor wheel
 
CMP sensor is damaged (cracked), or it has failed
 
Electromagnetic interference in CMP sensor circuit (due to the sensor wires routed to close to ignition cables or motors)
 
Excessive air gap between reluctor wheel and sensor magnet
 
Foreign material lodged between sensor and the reluctor wheel
 
PCM has failed
 

Trouble Code: P0342



Camshaft Position Sensor Circuit Low Input

Possible Causes:



CMP sensor connector is damaged or open
 
CMP sensor signal circuit is shorted to ground
 
CMP sensor signal circuit is open or it has high resistance
 
CMP sensor reluctor wheel is damaged or loose
 
PCM has failed
 

Trouble Code: P0343



Camshaft Position Sensor Circuit Low Input

Possible Causes:



CMP sensor connector is damaged or shorted
 
CMP sensor signal circuit is open
 
CMP sensor signal circuit is shorted to system power
 
CMP sensor is damaged or it has failed
 
CMP sensor reluctor wheel is damaged or loose
 
PCM 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)
 

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: P0440



EVAP System Large Leak Detected

Possible Causes:



Fuel filler cap is loose, cross-threaded, damaged or missing
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank vapor line(s) is clogged, damaged or disconnected
 
Fuel tank pressure sensor low reference circuit is open
 
Fuel tank pressure sensor is damaged or it has failed
 
EVAP charcoal canister is clogged or loaded with fuel or water
 
EVAP purge or EVAP vent valve is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0442



EVAP System Small Leak (0.040") Detected

Possible Causes:



Fuel filler cap is loose, cross-threaded, damaged or wrong part
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank vapor line(s) is clogged, damaged or disconnected
 
Fuel tank pressure sensor low reference circuit is open
 
Fuel tank pressure sensor is damaged or it has failed
 
EVAP charcoal canister is clogged or loaded with fuel or water
 
EVAP purge or EVAP vent valve is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0443



EVAP Purge Solenoid Control Circuit Malfunction

Possible Causes:



Purge solenoid connector is damaged or open
 
Purge solenoid control circuit is open
 
Purge solenoid power circuit is open (test the Manifold fuse)
 
Purge solenoid is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0444



EVAP Purge Solenoid Control Circuit Low Input

Possible Causes:



Purge solenoid connector is damaged or shorted
 
Purge solenoid control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0445



EVAP Purge Solenoid Control Circuit High Input

Possible Causes:



Purge solenoid connector is damaged or shorted
 
Purge solenoid control circuit is shorted to system power (B+)
 
Purge solenoid valve is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0446



EVAP Vent Solenoid Vent Path Restricted

Possible Causes:



Charcoal canister fresh air inlet is blocked or restricted
 
EVAP vent fresh air hose is clogged, kinked or restricted
 
EVAP vent solenoid is damaged or it has failed
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
PCM has failed
 

Trouble Code: P0447



EVAP Vent Solenoid Control Circuit Low Input

Possible Causes:



Vent solenoid connector is damaged or shorted
 
Vent solenoid control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0448



EVAP Vent Solenoid Control Circuit High Input

Possible Causes:



Vent solenoid connector is damaged or open
 
Vent solenoid control circuit is shorted to power
 
Vent solenoid is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0449



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid connector is damaged or open
 
Vent solenoid control circuit is open
 
Vent solenoid power circuit is open (test the Manifold fuse)
 
Vent solenoid is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0451



Fuel Tank Pressure Sensor Signal Range/Performance

Possible Causes:



FTP sensor signal circuit is open, shorted to ground or to VREF
 
FPT sensor VREF is open or shorted to ground
 
FTP sensor is contaminated, damaged, skewed or has failed
 
PCM has failed
 

Trouble Code: P0452



Fuel Tank Pressure Sensor Circuit Low Input

Possible Causes:



FTP sensor connector is damaged or shorted
 
FTP sensor signal circuit is shorted to ground
 
FTP sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0453



Fuel Tank Pressure Sensor Circuit High Input

Possible Causes:



FTP sensor connector is damaged or open
 
FTP sensor signal circuit is open or shorted to 5v VREF circuit
 
FTP sensor 5v VREF circuit shorted to low reference circuit
 
FTP sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0480



Cooling Fan Relay 1 Control Circuit Malfunction

Possible Causes:



Fan control relay control circuit is open or shorted to ground
 
Fan control relay control circuit is shorted to system power
 
Fan control relay power circuit is open (check Cool Fan 1 fuse)
 
Fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0481



Cooling Fan Relay 2 Control Circuit Malfunction

Possible Causes:



Fan control relay control circuit is open or shorted to ground
 
Fan control relay control circuit is shorted to system power
 
Fan control relay power circuit is open (check Cool Fan 2 fuse)
 
Fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0496



EVAP System Vacuum During Non-Purge Condition

Possible Causes:



EVAP purge valve is damaged or it has failed
 
Use the Service Bay Test to diagnose the cause of this code
 

Trouble Code: P0500



Vehicle Speed Sensor Range/Performance (5L40-E)

Possible Causes:



Perform a Diagnostic Circuit Check for the PCM
 
If DTC U2100, U2104, U2105 or U2106 is set, repair them first
 
If DTC P0722 or P0723 are set, repair these trouble codes first
 

Trouble Code: P0506



Idle Speed Too Low

Possible Causes:



Base engine problem (i.e., compression or misfire condition)
 
TAC motor connector is damaged, loose or shorted
 
Throttle valves not in their at rest position
 
Throttle valves binding open or are binding closed
 
Throttle valves moving open or closed without spring pressure
 
Throttle body assembly is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0507



Idle Speed Too High

Possible Causes:



Engine vacuum leaks, PCM valve is leaking or the wrong valve
 
Base engine problem (i.e., compression or misfire condition)
 
TAC motor connector is damaged, loose or shorted
 
Throttle valves not in their at rest position
 
Throttle valves binding open or are binding closed
 
Throttle valves moving open or closed without spring pressure
 
Throttle body assembly is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0560



System Voltage Malfunction

Possible Causes:



Check for high resistance at battery connections or the U/H Fuse Block power circuit
 
Check the drive belt for excessive wear and the proper tension
 
Check the condition of the battery and the Generator output
 

Trouble Code: P0562



System Voltage Circuit Low Input

Possible Causes:



Check for high resistance at battery connections or the U/H Fuse Block power circuit
 
Check the drive belt for excessive wear and the proper tension
 
Check the condition of the battery and the Generator output
 
Vehicle may have been used to jump-start another vehicle
 

Trouble Code: P0563



System Voltage Circuit High Input

Possible Causes:



Check the condition of the battery (it may be worn out)
 
Test the operation of the Generator (it may be overcharging)
 
Vehicle may have been used to jump-start another vehicle
 

 
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