GrandPrix, Impala 2006-2008, Monte Carlo 2006-2007

3.9L V6 VIN 3 Auto 2

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Trouble Code: P0135



HO2S Heater Performance (Bank 1 Sensor 1)

Possible Causes:



HO2S ignition circuit for a short to ground or an open/high resistance
 
HO2S control circuit for a short to voltage, or an open/high resistance
 
HO2S control circuit for a short to ground
 
HO2S is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0138



HO2S Circuit High Voltage (Bank 1 Sensor 2)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0140



HO2S Circuit Insufficient Activity (Bank 1 Sensor 2)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0141



HO2S Heater Performance (Bank 1 Sensor 2)

Possible Causes:



HO2S ignition circuit for a short to ground or an open/high resistance
 
HO2S control circuit for a short to voltage, or an open/high resistance
 
HO2S control circuit for a short to ground
 
HO2S is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0151



HO2S Circuit Low Voltage Bank (2 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0152



HO2S Circuit High Voltage (Bank 2 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0154



HO2S 21 (Bank 2 Sensor 1) Insufficient Activity

Possible Causes:



HO2S damaged or has failed
 
Low or high fuel system pressure
 
Engine vacuum leaks
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0154



Insufficient Activity (Bank 2 Sensor 1)

Possible Causes:



HO2S damaged or has failed
 
Low or high fuel system pressure
 
Engine vacuum leaks
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0155



HO2S Heater Performance (Bank 2 Sensor 1)

Possible Causes:



HO2S heater control circuit is open or it is shorted to ground
 
HO2S control circuit open or high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0157



HO2S Circuit Low Voltage (Bank 2 Sensor 2)

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
low reference circuit for an open/high resistance or for a short to voltage
 
Fuel pressure that is too low or too high
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
Lean, rich, or leaking fuel injectors
 
ECM has failed
 

Trouble Code: P0158



HO2S Circuit High Voltage (Bank 2 Sensor 2)

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal circuit is shorted to system power (B+)
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
ECM has failed
 

Trouble Code: P0160



HO2S Circuit Insufficient Activity (Bank 2 Sensor 2)

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal circuit is shorted to system power (B+)
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
ECM has failed
 

Trouble Code: P0161



HO2S Heater Performance (Bank 2 Sensor 2)

Possible Causes:



HO2S heater control circuit is open or it is shorted to ground
 
HO2S control circuit open or high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0167D



Control Module Ignition Coil Internal Circuit

Possible Causes:



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

Trouble Code: P0191



Fuel Rail Pressure (FRP) Sensor Performance

Possible Causes:



(A condition with the fuel tank module or the fuel pump control module (FECM) will set this DTC)
 
low reference circuit for an open/high resistance
 
5-volt reference circuit for a short to ground or an open/high resistance
 
5-volt reference circuit for a short to voltage
 
signal circuit terminal 12 for a short to ground
 
FRP sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0192



Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage

Possible Causes:



FRP sensor 5-volt power circuit is open or shorted to ground
 
FRP Sensor signal circuit is shorted to ground
 
FRP Sensor is damaged or has failed
 
ECM has failed
 

Trouble Code: P0193



Fuel Rail Pressure Sensor Circuit High Voltage

Possible Causes:



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

Trouble Code: P0201



Fuel Injector 1 Control Circuit Malfunction

Possible Causes:



Injector 1 power circuit (B+) is open (check the power fuse)
 
Injector 1 control circuit is open between injector and ECM
 
Injector 1 control circuit is grounded between injector and ECM
 
Injector 1 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0202



Fuel Injector 2 Control Circuit Malfunction

Possible Causes:



Injector 2 power circuit (B+) is open (check the power fuse)
 
Injector 2 control circuit is open between injector and ECM
 
Injector 2 control circuit is grounded between injector and ECM
 
Injector 2 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0203



Fuel Injector 3 Control Circuit Malfunction

Possible Causes:



Injector 3 power circuit (B+) is open (check the power fuse)
 
Injector 3 control circuit is open between injector and ECM
 
Injector 3 control circuit is grounded between injector and ECM
 
Injector 3 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0204



Fuel Injector 4 Control Circuit Malfunction

Possible Causes:



Injector 4 power circuit (B+) is open (check the power fuse)
 
Injector 4 control circuit is open between injector and ECM
 
Injector 4 control circuit is grounded between injector and ECM
 
Injector 4 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0205



Fuel Injector 5 Control Circuit Malfunction

Possible Causes:



Injector 5 power circuit (B+) is open (check the power fuse)
 
Injector 5 control circuit is open between injector and ECM
 
Injector 5 control circuit is grounded between injector and ECM
 
Injector 5 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0206



Fuel Injector 6 Control Circuit Malfunction

Possible Causes:



Injector 6 power circuit (B+) is open (check the power fuse)
 
Injector 6 control circuit is open between injector and ECM
 
Injector 6 control circuit is grounded between injector and ECM
 
Injector 6 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0207



Fuel Injector 7 Control Circuit Malfunction

Possible Causes:



Injector 7 power circuit (B+) is open (check the power fuse)
 
Injector 7 control circuit is open between injector and ECM
 
Injector 7 control circuit is grounded between injector and ECM
 
Injector 7 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0208



Fuel Injector 8 Control Circuit Malfunction

Possible Causes:



Injector 8 power circuit (B+) is open (check the power fuse)
 
Injector 8 control circuit is open between injector and ECM
 
Injector 8 control circuit is grounded between injector and ECM
 
Injector 8 is damaged or it has failed
 
ECM is damaged
 

Trouble Code: P0221



Throttle Position (TP) Sensor 2 Circuit Low Voltage

Possible Causes:



TP sensor low reference circuit for an open/high resistance
 
TP sensor 5-volt reference circuit for a short to ground or an open/high resistance
 
TP sensor 5-volt reference circuit for a short to voltage
 
TP sensor signal circuit for a short to voltage
 
TP sensor signal circuit for a short to ground or an open/high resistance
 
TP sensor has failed (replace throttle body)
 
ECM has failed
 

Trouble Code: P0222



Throttle Position (TP) Sensor 2 Circuit Low Voltage

Possible Causes:



TP Sensor 2 signal circuit is open or shorted to ground
 
TP Sensor 2 VREF (5v) circuit is open, or TP Sensor 2 ground circuit is open
 
TP Sensor 2 is damaged or has failed (replace the throttle body assembly)
 
ECM is damaged
 

Trouble Code: P0223



Throttle Position (TP) Sensor 2 Circuit High Voltage

Possible Causes:



TP Sensor 2 signal circuit is open or shorted to ground
 
TP Sensor 2 VREF (5v) circuit is open, or TP Sensor 2 ground circuit is open
 
TP Sensor 2 is damaged or has failed (replace the throttle body assembly)
 
ECM is damaged
 

Trouble Code: P0231



Fuel Pump Control Circuit High Voltage

Possible Causes:



ECM fuel pump output control circuit for a short to voltage.
 
ECM fuel pump output control circuit for a short to ground or an open/high resistance
 
FECM control circuit terminal 2 for a short to voltage or an open/high resistance
 
Faulty FECM
 
Faulty fuel tank fuel pump module
 

Trouble Code: P0232



Fuel Pump Control Circuit

Possible Causes:



ECM fuel pump output control circuit for a short to voltage.
 
ECM fuel pump output control circuit for a short to ground or an open/high resistance
 
FECM control circuit terminal 2 for a short to voltage or an open/high resistance
 
Faulty FECM
 
Faulty fuel tank fuel pump module
 

Trouble Code: P023F



Supercharger Boost Solenoid Control Circuit Malfunction

Possible Causes:



Boost solenoid circuit is open between the solenoid and ECM
 
Boost solenoid circuit is shorted to ground
 
Boost solenoid power circuit is open to system power
 
Boost solenoid is damaged or has failed
 
ECM has failed
 

Trouble Code: P0261



Injector 1 Control Circuit High Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0262



Injector 2 Control Circuit Low Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0264



Injector 2 Control Circuit High Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0265



Injector 3 Control Circuit Low Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0267



Injector 3 Control Circuit High Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0268



Injector 4 Control Circuit Low Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0270



Injector 4 Control Circuit High Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0271



Injector 5 Control Circuit Low Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P0273



Injector 5 Control Circuit High Voltage

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

 
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