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P2271




DTC P0137, P0138, P013A, P013B, P013E, P013F, P0140, P2270, or P2271 (LUW)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors
DTC P0137
- HO2S Circuit Low Voltage Sensor 2

DTC P0138
- HO2S Circuit High Voltage Sensor 2

DTC P013A
- HO2S Slow Response Rich to Lean Sensor 2

DTC P013B
- HO2S Slow Response Lean to Rich Sensor 2

DTC P013E
- HO2S Delayed Response Rich to Lean Sensor 2

DTC P013F
- HO2S Delayed Response Lean to Rich Sensor 2

DTC P0140
- HO2S Circuit Insufficient Activity Sensor 2

DTC P2270
- HO2S Signal Stuck Lean Sensor 2

DTC P2271
- HO2S Signal Stuck Rich Sensor 2

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 275 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0137
* DTCs P0068, P0106, P0107, P0108, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 are not set.
* The ignition signal parameter is between 10-32 V.
* The fuel level is greater than 10%.
* The mass air flow (MAF) sensor parameter is between 2-60 g/s.
* The fuel composition is less than 87% ethanol.
* The fuel system is in Closed Loop.
* DTC P0137 runs once per drive cycle when the above conditions are met for 5 s.

P0138
* DTCs P0068, P0101, P0102, P0103, P0121, P0122, P0123, P0222, P0223, P1516, P2101, P2119, P2135, P2176 are not set.
* The ignition signal parameter is between 10-32 V.
* Engine run time is equal to or greater than 5 s.
* The mass air flow (MAF) sensor parameter is between 2-60 g/s.
* The fuel composition is less than 87% ethanol.
* DTC P0138 runs once per drive cycle when the above conditions are met for 3 s.

P013A
* DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10%.
* DTC P013B, P013E, P013F, P2270 and P2271 have run.
* DTC P013E and P2270 have passed.
* DTC P013A runs once per trip

P013B
* DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10%.
* DTC P013A, P013E, P013F, P2270 and P2271 have run.
* DTC P013F and P2271 have passed.
* DTC P013B runs once per trip

P013E
* DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10%.
* DTC P013A, P013B, P013F, P2270 and P2271 have run.
* DTC P2270 have passed.
* DTC P013E runs once per trip

P013F
* DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10%.
* DTC P013A, P013B, P013E, P2270 and P2271 have run.
* DTC P2270 and P2271 have passed.
* DTC P013F runs once per trip

P0140
* DTCs P0068, P0101, P0102, P0103, P0121, P0122, P0123, P0222, P0223, P1516, P2101, P2119, P2135, P2176 are not set.
* The ignition signal parameter is between 10-32 V.
* The fuel level is more than 10%.
* Engine run time is equal to or greater than 5 s.
* The mass air flow (MAF) sensor parameter is between 2-60 g/s.
* The fuel composition is less than 87% ethanol.
* DTC P0140 runs once per drive cycle when the above conditions are met for 3 s.

P2270
* DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
* The ignition signal parameter is between 10-32 V.
* The fuel level is greater than 10%.
* The engine speed parameter is between 1 100-3 500 RPM.
* The mass air flow (MAF) sensor parameter is between 1-30 g/s.
* The fuel composition is less than 87% ethanol.
* The fuel system is in Closed Loop.
* DTC P013A, P013B, P013E, P013F, P2270 and P2271 have run.
* DTC P2270 and P2271 have passed.
* DTC P2270 runs once per drive cycle when the above conditions are met for 5 s.

P2271
* DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
* The ignition signal parameter is between 10-32 V.
* The fuel level is greater than 10%.
* The engine speed parameter is between 1 100-3 500 RPM.
* The mass air flow (MAF) sensor parameter is between 1-30 g/s.
* The fuel composition is less than 87% ethanol.
* The fuel system is in Closed Loop.
* DTC P013A, P013B, P013E, P013F and P2270 have run.
* DTC P013A, P013E and P2270 have passed.
* DTC P2271 runs once per drive cycle when the above conditions are met for 5 s.

Conditions for Setting the DTC

P0137

The ECM detects that the HO2S Voltage parameter is less than 20 mV.

P0138

The ECM detects that the HO2S Voltage parameter is greater than 1 050 mV.

P013A

The ECM detects that the accumulated mass air flow monitored during rich to lean transitions between 150-450 mV is more than 6 g.

P013B

The ECM detects that the accumulated mass air flow monitored during rich to lean transitions between 335-650 mV is more than 25 g.

P013E

The ECM detects that the Post O2 sensor voltage is greater than 450 mV and the accumulated mass air flow monitored during the delayed Response Test is greater than 20 g.

P013F

The ECM detects that the Post O2 sensor voltage is less than 350 mV and the accumulated mass air flow monitored during the delayed Response Test is greater than 70 g.

P0140

The ECM detects that the heated oxygen sensor (HO2S) 2 parameter is greater than 1 700 mV.

P2270
* The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage equal to or more than 775 mV.
* The ECM detects that the accumulated mass air flow monitored during the Stuck Lean Voltage Test is more than 38 g.

P2271
* The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage equal to or less than 100 mV.
* The ECM detects that the accumulated mass air flow monitored during the stuck rich voltage test is more than 25 g.

Action Taken When the DTC Sets

* DTCs P0137, P0138, P013E, P013F, P0140, P2270, P2271 are Type B DTCs.
* DTCs P013A and P013B are Type A DTCs.

Conditions for Clearing the DTC

* DTCs P0137, P0138, P013E, P013F, P0140, P2270, P2271 are Type B DTCs.
* DTCs P013A and P013B are Type A DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics (LUW) [1][2]Electrical Diagrams
Connector End View Reference

Component Connector End Views Sunshade - Left (D6I)
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Heated Oxygen Sensor Wiring Repairs Heated Oxygen Sensor Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. If any heated oxygen sensor (HO2S) heater DTCs are set, perform those diagnostics first.
2. Allow the engine to reach operating temperature.
3. Engine running, observe the HO2S bank 1 sensor 2 parameter with a scan tool. The value should change more than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and back to closed after running the engine at 1 500 RPM for 30 s.

Caution: Refer to Silicon Contamination of Heated Oxygen Sensors Caution Silicon Contamination of Heated Oxygen Sensors Caution.

4. The B52B Heated Oxygen Sensor 2 may be damaged due to contamination. Prior to replacing the B52B Heated Oxygen Sensor 2, inspect for the following sources of contamination:

* A silicon contaminated HO2S
* Fuel contamination, refer to Alcohol/Contaminants-in-Fuel Diagnosis Testing and Inspection.
* Engine oil consumption, refer to Oil Consumption Diagnosis Oil Consumption Diagnosis.
* Engine coolant consumption, refer to Symptoms - Engine Cooling Symptoms - Engine Cooling.

5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Circuit/System Testing

Note: All modules must be powered down or misdiagnosis may result.

1. Verify none of the following conditions exist:

* Lean or rich fuel injectors, refer to DTC P0171 or P2097 (LUW) P0171 and DTC P0172 or P2096 (LUW) P0172.
* Water intrusion in the HO2S harness connector
* Low or high fuel system pressure, refer to Fuel Pressure Measurement (1.6L LDE, LXV, 1.8L 2H0, and LUW) Fuel Pressure Measurement.
* Fuel that is contaminated, refer to Alcohol/Contaminants-in-Fuel Diagnosis Testing and Inspection.
* Fuel saturation of the evaporative emission (EVAP) canister
* Exhaust leaks near the HO2S
* Engine vacuum leaks
* Engine oil consumptions, refer to Oil Consumption Diagnosis Oil Consumption Diagnosis.
* Engine coolant consumption, refer to Symptoms - Engine Cooling Symptoms - Engine Cooling.

• If you find any of the above conditions, repair as necessary.

2. Ignition OFF, disconnect the harness connector at the B52B Heated Oxygen Sensor 2.
3. Ignition OFF, all vehicles systems OFF. It may take up to 2 min for all vehicle systems to power down.
4. Measure for less than 5 ohm between B52B Heated Oxygen Sensor 2 low signal circuit terminal 3 and ground.

• If more than the specified range, test the B52B Heated Oxygen Sensor 2 low signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

5. Ignition ON, observe the scan tool HO2S bank 1 sensor 2 parameter. The parameter should display between 1 850-1 950 mV.

• If less than the specified range, test the high and low signal circuits for a short to ground. If both signal circuit test normal, replace the K20 Engine Control Module.

6. Measure for 1 850-3 000 mV between the high signal circuit terminal 4 and ground.

• If less than the specified range, test the high signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
• If greater than the specified range, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

7. Install a 3 A fused jumper wire between the B52B Heated Oxygen Sensor 2 signal circuit terminal 4 and the low reference circuit terminal 3. Engine running, verify the scan tool HO2S parameter is less than 60 mV.

• If greater than the specified value, replace the K20 Engine Control Module.

8. If all circuits test normal, replace the B52B Heated Oxygen Sensor 2.

Repair Instructions

Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution Heated Oxygen Sensor Resistance Learn Reset Caution.

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Sensor 2 Heated Oxygen Sensor Replacement - Sensor 2
* Control Module References Control Module References for ECM replacement, programming and setup

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