Vibe 2006-2007

1.8L L4 VIN L Std 4

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Trouble Code: P2122



Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Trouble Code: P2123



Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

Trouble Code: P2125



Accelerator Pedal Position (APP) Sensor 2 Circuit

Trouble Code: P2127



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Trouble Code: P2128



Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

Trouble Code: P2135



Throttle Position (TP) Sensor 1-2 Correlation

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Trouble Code: P2195



Heated Oxygen Sensor (HO2S) Signal Biased Lean Sensor 1

Possible Causes:



A DTC P2195 is more likely to set during city driving. Avoid operating the vehicle on the highway when validating a DTC P2195.
 
The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Increasing the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to exceed 800 mV. Decreasing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to drop to less than 100 mV. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing a Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
If a DTC P2195 is intermittent, driving the vehicle under the conditions outlined in the Inspection/Maintenance (I/M) section can verify whether the fault is present. Refer to Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure .
 
Check for any of the following conditions:

A mis-routed heated oxygen sensor wiring--The sensor pigtail may be mis-routed and contacting the exhaust system causing a short to ground.
 
Verify the PCM to engine electrical grounds are OK.
 
An incorrect fuel pressure--The fuel system can go lean if the fuel pressure is too low and DTC P2195 may be set. Refer to Fuel System Diagnosis .
 
An incorrectly calibrated fuel injector
 
Any vacuum leaks--Inspect for disconnected or damaged vacuum hoses and for vacuum leaks at the intake manifold, the throttle body, and the crankcase ventilation system.
 
Any exhaust leaks near the HO2S--An exhaust leak may cause outside air to be pulled into the exhaust gas stream and past the HO2S. The outside air may cause DTC P2195 to set.
 
A shorted HO2S--An HO2S that is shorted to ground will display less than 0.1 volt on the scan tool. Water contamination of the HO2S can cause a low or high HO2S voltage to be indicated. A DTC P2195 that occurs more frequently when driving through standing water or when operating the vehicle in wet driving conditions can indicate water intrusion. Replace the HO2S if the sensor is adversely affected by moisture.
 
A contaminated HO2S--Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S, determine the cause of the contamination and correct the condition.
 
Fuel contamination--Small amounts of water can be delivered to the fuel injectors and cause a lean exhaust indication. A lean exhaust indication can also be caused by too much alcohol in the fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
 
A faulty electrical connection to the PCM
 

An intermittent malfunction may be caused by a fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions . Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.
 

Trouble Code: P2196



Heated Oxygen Sensor (HO2S) Signal Biased Rich Sensor 1

Possible Causes:



A DTC P2196 is more likely to set during city driving. Avoid operating the vehicle on the highway when validating a DTC P2196.
 
The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Increasing the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to exceed 800 mV. Decreasing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to drop to less than 100 mV. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing a Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
If a DTC P2196 is intermittent, driving the vehicle under the conditions outlined in the Inspection/Maintenance (I/M) section can verify whether the fault is present. Refer to Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure .
 
Check for any of the following conditions:

A mis-routed heated oxygen sensor wiring--The sensor pigtail may be mis-routed and contacting the exhaust system causing a short to ground.
 
Verify the PCM to engine electrical grounds are OK.
 
An incorrect fuel pressure--The fuel system can go lean if the fuel pressure is too low and DTC P2196 may be set. Refer to Fuel System Diagnosis .
 
An incorrectly calibrated fuel injector
 
A shorted HO2S--An HO2S that is shorted to voltage will display a reading of more than 1.0 volt on the scan tool. Water contamination of the HO2S can cause a low or high HO2S voltage to be indicated. A DTC P2196 that occurs more frequently when driving through standing water or when operating the vehicle in wet driving conditions can indicate water intrusion. Replace the HO2S if the sensor is adversely affected by moisture.
 
A contaminated HO2S--Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S, determine the cause of the contamination and correct the condition.
 
A faulty electrical connection to the PCM
 
A saturated evaporative emission (EVAP) canister or a faulty EVAP purge control--Refer to Evaporative Emission (EVAP) Control System Diagnosis .
 

An intermittent malfunction may be caused by a fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions . Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.
 

Trouble Code: P2238



Heated Oxygen Sensor (HO2S) Pumping Current Control Circuit Low Voltage Sensor 1

Possible Causes:



The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Commanding the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to decrease to less than 3.0 V. Changing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to increase to more than 3.35 V. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing the Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
Check for a contaminated HO2S. Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S determine the cause of the contamination and correct the condition.
 
Verify the PCM to engine electrical grounds are OK.
 
An intermittent malfunction may be caused by fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for any intermittent conditions. Refer to Intermittent Conditions .
 

Trouble Code: P2239



Heated Oxygen Sensor (HO2S) Pumping Current Control Circuit High Voltage Sensor 1

Possible Causes:



The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Commanding the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to decrease to less than 3.0 volts. Changing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to increase to more than 3.35 volts. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing the Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
Check for a contaminated HO2S. Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S determine the cause of the contamination and correct the condition.
 
Verify the PCM to engine electrical grounds are OK.
 
An intermittent malfunction may be caused by fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for any intermittent conditions. Refer to Intermittent Conditions .
 

Trouble Code: P2252



Heated Oxygen Sensor (HO2S) Low Reference Circuit Low Voltage Sensor 1

Possible Causes:



The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Commanding the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to decrease to less than 3 volts. Changing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to increase to more than 3.35 volts. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing the Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
Check for a contaminated HO2S. Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S determine the cause of the contamination and correct the condition.
 
Verify the PCM to engine electrical grounds are OK.
 
An intermittent malfunction may be caused by fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for any intermittent conditions. Refer to Intermittent Conditions .
 

Trouble Code: P2253



Heated Oxygen Sensor (HO2S) Low Reference Circuit High Voltage Sensor 1

Possible Causes:



The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Commanding the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to decrease to less than 3 volts. Changing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to increase to more than 3.35 volts. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing the Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
Check for a contaminated HO2S. Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S determine the cause of the contamination and correct the condition.
 
Verify the PCM to engine electrical grounds are OK.
 
An intermittent malfunction may be caused by fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for any intermittent conditions. Refer to Intermittent Conditions .
 

Trouble Code: P2401



Evaporative Emission (EVAP) System Leak Detection Pump Control Circuit Low Voltage

Trouble Code: P2402



Evaporative Emission (EVAP) System Leak Detection Pump Control Circuit High Voltage

Trouble Code: P2419



Fuel Tank Pressure (FTP) Control Solenoid Control Circuit Low Voltage

Trouble Code: P2420



Fuel Tank Pressure (FTP) Control Solenoid Control Circuit High Voltage

Trouble Code: P2430



Secondary Air Injection (AIR) System Pressure Sensor Circuit

Possible Causes:



An intermittent malfunction may be caused by a fault in an AIR pressure sensor electrical circuits. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
 
If the DTC cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.
 
Operating the vehicle in Check Mode will increase the ability of the PCM to detect engine control system malfunctions. Refer to Check Mode in Service Bay Test .
 

Trouble Code: P2431



Secondary Air Injection (AIR) System Pressure Sensor Performance

Possible Causes:



An intermittent malfunction may be caused by a fault in an AIR pressure sensor electrical circuits. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
 
If the DTC cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.
 
Operating the vehicle in Check Mode will increase the ability of the PCM to detect engine control system malfunctions. Refer to Check Mode in Service Bay Test .
 

Trouble Code: P2432



Secondary Air Injection (AIR) System Pressure Sensor Circuit Low Voltage

Possible Causes:



An intermittent malfunction may be caused by a fault in an AIR pressure sensor electrical circuits. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
 
If the DTC cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.
 
Operating the vehicle in Check Mode will increase the ability of the PCM to detect engine control system malfunctions. Refer to Check Mode in Service Bay Test .
 

Trouble Code: P2433



Secondary Air Injection (AIR) System Pressure Sensor Circuit High Voltage

Possible Causes:



An intermittent malfunction may be caused by a fault in an AIR pressure sensor electrical circuits. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
 
If the DTC cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.
 
Operating the vehicle in Check Mode will increase the ability of the PCM to detect engine control system malfunctions. Refer to Check Mode in Service Bay Test .
 

Trouble Code: P2440



Secondary Air Injection (AIR) System Shut-Off Valve Stuck Open

Trouble Code: P2441



Secondary Air Injection (AIR) System Shut-Off Valve Stuck Closed

Trouble Code: P2444



Secondary Air Injection (AIR) System Pump Stuck On

Possible Causes:

Inspect for any of the following conditions:



The resistance of the AIR pump relay--The resistance across terminal 1 and terminal 2 is 85-95 ohms at 20°C (68°F). The resistance across terminal 3 and terminal 4 is infinite.
 
The AIR pump relays electrical contacts may be pitted and sticking. Replace the relay if tapping gently on the relay or wiggling the relay causes a change in the relays operation.
 
The performance of the AIR pump relay may be affected by temperature. Check the relay after sitting outside overnight and after running the engine 30 minutes.
 
An intermittent malfunction may be caused by a fault in an AIR system electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
 

Trouble Code: P2445



Secondary Air Injection (AIR) System Pump Stuck Off

Possible Causes:

Inspect for any of the following conditions:



The resistance of the AIR pump relay--The resistance across terminal 1 and terminal 2 is 85-95 ohms at 20°C (68°F). The resistance across terminal 3 and terminal 4 is infinite.
 
The AIR pump relays electrical contacts may be pitted or sticking. Replace the relay if tapping gently on the relay or wiggling the relay causes a change in the relays operation.
 
The performance of the AIR pump relay may be affected by temperature. Check the relay after sitting outside overnight and after running the engine 30 minutes.
 
An intermittent malfunction may be caused by a fault in an AIR system electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .
 

Trouble Code: P2610



Control Module Ignition Off Timer Performance

Possible Causes:



Check the PCM for water contamination. Water entering the PCM can cause damage and corrosion to the circuit boards and to internal components. Repair the source of the water entry before the installation of a replacement PCM. A DTC P0606 or P2610 can set if an incorrect PCM is installed in the vehicle. Install the correct PCM according to the vehicle and/or the engine type and equipment options.
 

Trouble Code: P2645



Rocker Arm Actuator Solenoid Control Circuit

Trouble Code: P2646



Rocker Arm Actuator System Stuck Off

Trouble Code: P2647



Rocker Arm Actuator System Stuck On

Trouble Code: P2716



TP Line Pressure Solenoid Circuit

Trouble Code: P2769



TCC Solenoid Circuit Short to Ground

Trouble Code: P2770



TCC Solenoid Circuit Open

Trouble Code: P2A00



Heated Oxygen Sensor (HO2S) Circuit Closed Loop (CL) Performance Sensor 1

Possible Causes:



The scan tool output control feature, Fuel Injector Modification, can be used at idle to check the oxygen sensor performance. Commanding the Fuel Injector Modification Commanded State to 25 percent should cause the HO2S 1 voltage to decrease to less than 3 volts. Changing the Fuel Injector Modification Commanded State to -12 percent should cause the HO2S 1 voltage to increase to more than 3.35 volts. An oxygen sensor that fails to respond accordingly may be faulty or contaminated. When performing the Fuel Injector Modification with the scan tool, the Loop Status will remain Open Loop and the Short Term FT will be fixed at 0 percent.
 
Inspect for a contaminated HO2S. Silicon contamination of the HO2S can cause a low signal voltage to be indicated. Silicon contamination is indicated by a powdery white deposit on the portion of the HO2S exposed to the exhaust stream. Before replacing the HO2S determine the cause of the contamination and correct the condition.
 
Verify the PCM to engine electrical grounds are OK.
 
An incorrect fuel pressure--The fuel system can go lean if the fuel pressure is too low and DTC P2A00 can be set. Refer to Fuel System Diagnosis .
 
Fuel contamination--Small amounts of water can be delivered to the fuel injectors and cause a lean exhaust indication. A lean exhaust indication can also be caused by too much alcohol in the fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
 
An incorrectly calibrated fuel injector--Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) and Fuel Injector Balance Test with Special Tool .
 
Any vacuum leaks--Inspect for disconnected or damaged vacuum hoses and for vacuum leaks at the intake manifold, the throttle body, and the crankcase ventilation system.
 
Any exhaust leaks near the HO2S--An exhaust leak may cause outside air to be pulled into the exhaust gas stream and past the HO2S causing DTC P2A00 to set.
 
An intermittent malfunction may be caused by fault in the HO2S 1 electrical circuit. Inspect the wiring harness and components for any intermittent conditions. Refer to Intermittent Conditions .
 

Trouble Code: U0073



CAN Bus Communication

Possible Causes:

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:



An open or high resistance in the CAN - high or CAN - low circuits
 
A short between the CAN - high and CAN - low circuits
 
A short to ground in the CAN - high or CAN - low circuits
 
A short to voltage in the CAN - high or CAN - low circuits
 
A steering wheel position sensor malfunction
 
A yaw rate sensor malfunction
 
An internal EBCM malfunction
 

Trouble Code: U0123



Yaw Rate Circuit Malfunction

Possible Causes:

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:



An open or high resistance in the yaw rate sensor ground circuit
 
An open, high resistance, or short to ground in the yaw rate sensor ignition voltage circuit
 
A yaw rate sensor malfunction
 

Trouble Code: U0124



CAN Bus Communication

Possible Causes:

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:



An open or high resistance in the yaw rate sensor ground circuit
 
An open, high resistance, or short to ground in the yaw rate sensor ignition voltage circuit
 
A yaw rate sensor malfunction
 

Trouble Code: U0126



CAN Steering Position Sensor Circuit Malfunction

Possible Causes:

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:



An open or high resistance in the steering wheel position sensor ground circuit
 
An open, high resistance, or short to ground in the steering wheel position sensor ignition voltage
 
A steering wheel position sensor malfunction
 

Trouble Code: U1500



Internal Comunication Malfunction

Possible Causes:



The diagnostic procedure used for DTC U1500 in OnStar® systems with single module generations of OnStar® differ greatly from previous generations with 2 modules. While these older generations denoted a failure of the 3-wire bus between the modules by setting a U1500, single module OnStar® systems use this DTC to denote an internal module failure. The determination of whether a one or 2-module generation of OnStar® is used should be confirmed. Refer to OnStar Description and Operation .
 
This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the VCIM.
 
If this DTC is retrieved as both a current and history DTC, replace the VCIM.
 

 
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