Malibu, Malibu MAXX 2006-2008

3.6L V6 VIN 7 Auto 4

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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
 

Trouble Code: P0719



TCC Brake Switch Circuit Low Input

Possible Causes:



TCC brake switch circuit is open or shorted to ground
 
TCC brake switch power circuit is open (test ABS or ERL fuse)
 
TCC brake switch is out of adjustment or damaged
 
ECM has failed
 

Trouble Code: P0741



TCC System Mechanically Stuck Off

Possible Causes:



Converter clutch apply valve stuck in "off" (release) position
 
Misaligned or damaged valve body gasket
 
Restricted apply valve passage
 
TCC PWM valve exhaust orifice in damaged or it has failed
 
TCC solenoid valve mechanically stuck in "off" position
 

Trouble Code: P1336



CKP Sensor System Variation Not Learned

Possible Causes:



Set the parking brake and block the drive wheels for safety.
 
Verify the hood is closed.
 
Read the trouble codes. If a code is set, refer to that code.
 
Start the engine. Allow engine temperature to reach at least 158°F (70°C). Then key off.
 
Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle.
 
Apply the brake pedal firmly and verify the selector is in Park.
 
Increase accelerator pedal position until fuel cutoff is reached at the test RPM (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (RPM) decreases back to idle speed and the procedure terminates.
 
Read the trouble codes and recheck for DTC P1336.
 
If DTC P1336 runs and passes, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.
 

Trouble Code: P1362



ICM Control Circuit High Input

Possible Causes:



IC timing signal is shorted to system power
 
IC timing control circuit and IC timing signal circuits are shorted
 
IC module is damaged or it has failed
 
ECM has failed
 

Trouble Code: P1380



Misfire Detected, Rough Road Data Not Available

Possible Causes:



Use the Freeze Frame/Failure Records data to help find the cause on an intermittent fault. If the code cannot be duplicated, the data in the Freeze Frame/Failure Records can determine how many miles since the code set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass or a fail. Operate the vehicle within the Freeze Frame conditions (i.e., load, engine and vehicle speed, temperature etc.). This will isolate when the code set.
 
Service the ABS before diagnosing a misfire because an actual engine misfire may or may not exist. Also, an actual engine misfire may have occurred during an ABS malfunction.
 
Determine if the vehicle was driven on a rough road, and the ABS could not detect this due to a malfunction. The ECM may interpret variations in crankshaft speed caused by the rough road as a misfire without an actual engine misfire present.
 
Refer to Diagnostic System Check for Antilock Brake System
 
Refer to Diagnostic System Check for the Engine Controls
 

Trouble Code: P1381



Misfire Detected - No Communication with Brake Control Module

Possible Causes:



If any ABS DTCs are set, diagnose those first
 
ABS module
 

Trouble Code: P1400



Cold Start Emission Reduction Control System

Possible Causes:



Air intake system for Damage, restriction, or modification
 
Dirty or deteriorating air filter element
 
Crankcase ventilation system for correct operation
 
Vacuum leak and other un-metered air downstream of the Mass Air Flow (MAF) sensor
 
Intake manifold leak
 
Damaged, restricted, modified or enhanced exhaust system
 
Exhaust leaks
 

 
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