Malibu, Malibu MAXX 2006-2008

3.5L V6 VIN N Auto 4

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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
 

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

Possible Causes:



FTP sensor signal circuit is shorted to VREF or system power
 
FTP sensor ground circuit is open between sensor and ECM
 
FTP sensor is damaged or has failed
 
ECM has failed
 

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

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
 

Trouble Code: P0452



Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

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
 

Trouble Code: P0455



Evaporative Emission (EVAP) System Large Leak Detected

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: P0458



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: P0459



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: P0497



Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit Low 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: P050A



Engine Oil Pressure Sensor Circuit Low Input

Possible Causes:



Engine oil level it too low
 
EOP sensor signal circuit is open or shorted to ground
 
EOP sensor VREF circuit is open
 
EOP sensor is damaged or has failed
 
Instrument Cluster or 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: 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
 

Trouble Code: P0607



Vehicle Speed Output Circuit Malfunction

Possible Causes:



VSS output signal circuit is open, shorted to ground or to power
 
VSS output signal problem related to the Instrument Cluster or the Electronic Suspension Control Module (internal problem)
 
ECM has failed
 

Trouble Code: P060D



Control Module Vehicle Options Incorrect

Possible Causes:



ECM is not properly programmed
 
ECM has failed
 

Trouble Code: P0627



Fuel Pump Enable Circuit Low Voltage

Possible Causes:



Short to voltage on the enable circuit
 
Fuel Pump Control Module (FECM)
 
ECM has failed
 

Trouble Code: P0628



Fuel Pump Relay Control Circuit Low Voltage

Possible Causes:



Fuel pump relay has failed
 
ECM has failed
 

Trouble Code: P0629



Fuel Pump Enable Circuit High Voltage

Possible Causes:



Short to voltage on the enable circuit
 
Fuel pump relay
 
ECM has failed
 

Trouble Code: P062B



Control Module Long Term Memory Performance

Possible Causes:



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

Trouble Code: P062F



Throttle Actuator Control (TAC) Command Performance

Possible Causes:



Throttle blade that is not in the rest position
 
Throttle valve that is binding open or closed
 
Throttle valve that opens or closes without spring pressure
 
Throttle body has failed
 
ECM has failed
 

Trouble Code: P0638



5-Volt Reference 1 Circuit

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to FTP. APP, EOP, and CMP sensors circuit is shorted to (B+)
 
ECM has failed
 

Trouble Code: P0642



5-Volt Reference 1 Circuit High Voltage

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to FTP. CMP IMTV or TP sensor circuit is shorted to (B+)
 
Component failure
 
ECM has failed
 

Trouble Code: P0643



Air Conditioning Clutch Relay Control Circuit Malfunction

Possible Causes:



A/C relay control circuit is open, shorted to ground or to power
 
A/C relay power circuit is open (test the A/C CRUISE mini fuse)
 
A/C relay is damaged or has failed
 
ECM has failed
 

Trouble Code: P064A



Malfunction Indicator Lamp (MIL) Control Circuit

Possible Causes:



IPC ignition circuit fuse is open,
 
IPC control circuit for a short to ground
 
IPC control circuit for a short to voltage or high resistance
 
IPC has failed
 
ECM has failed
 

Trouble Code: P0650



5-Volt Reference 2 Circuit

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to APP. CKP, and CMP brake booster vacuum sensor circuit is shorted to (B+)
 
ECM has failed
 

Trouble Code: P0652



5-Volt Reference 2 Circuit Low Voltage

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to TP, CKP or APP sensor circuit is shorted to (B+)
 
ECM has failed
 

Trouble Code: P0653



5-Volt Reference 2 Circuit High Voltage

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to APP TP or CKP sensor circuit is shorted to (B+)
 
Component failure
 
ECM has failed
 

Trouble Code: P0689



Engine Controls Ignition Relay De-energized Too Late

Possible Causes:



Powertrain relay shorted to ground on the control circuit
 
Powertrain relay shorted to voltage or an open/high resistance
 
Powertrain relay has failed
 
ECM has failed
 

Trouble Code: P0697



5-Volt Reference 3 Circuit Low Voltage

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to TPS, CKP or APP sensor circuit is shorted to (B+)
 
ECM has failed
 

Trouble Code: P0698



5-Volt Reference 3 Circuit High Voltage

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to TPS, CKP or APP sensor circuit is shorted to (B+)
 
ECM has failed
 

Trouble Code: P0699



Fuel Pump Control Module Requested MIL Illumination

Possible Causes:



Emissions failure in fuel pump control system
 

Trouble Code: P06A6



Transmission Control Module (TCM) Requested MIL Illumination

Possible Causes:



MIL control circuit is shorted to ground
 
Check the TCM for any trouble codes in memory that are responsible for the request to turn on the MIL
 
TCM has failed
 

Trouble Code: P0700



Clutch Switch Circuit Malfunction (M49/MM6)

Possible Causes:



Clutch switch circuit is open, shorted to ground or to power
 
Clutch switch power circuit is open (test the ENG IGN fuse)
 
Clutch switch is out of adjustment, damaged or has failed
 
ECM has failed
 

 
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