Buick Regal: DTC P0137, P0138, P013A, P013B, P013E, P013F, P2270, or P2271
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides 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 P2270
HO2S Signal Stuck Lean Sensor 2
DTC P2271
HO2S Signal Stuck Rich Sensor 2
Diagnostic Fault Information
Typical Scan Tool Data
HO2S Sensor 2
Circuit/System Description
The heated oxygen sensors (HO2S) are used for fuel control and catalyst
monitoring. Each HO2S 2
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. While the engine runs,
the HO2S heats up and
begins to generate a voltage within a range of 0 - 1, 000 mV. 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 toward 1, 000 mV
indicates a rich fuel
mixture. An HO2S voltage that decreases 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, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113,
P0116, P0117, P0118,
P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206,
P0207, P0208,
P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101,
P2119, P2135,
P2176 are not set.
- The Ignition voltage is between 10 - 32 V.
- The fuel system is operating in Closed Loop.
- Device controls are not active.
- The fuel level is greater than 10 %.
- Ethanol content is less than 87 %.
- Decel fuel cut-off is not active.
- The DTCs run continuously when the above conditions are met for 5 s.
P0138
- DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113,
P0116, P0117, P0118,
P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206,
P0207, P0208,
P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101,
P2119, P2135,
P2176 are not set.
- The Ignition voltage is between 10 - 32 V.
- Ignition is OFF for greater than 8 h.
- The fuel system is operating in Closed Loop.
- Ethanol content is less than 87 %.
- The fuel level is greater than 10 %.
- The engine run time is greater than 30 s.
- The engine is not in Power Enrichment.
- The DTCs run continuously after an initial delay of 3 min when the above
conditions are met for 5
s.
P013A or P013E
- Before the ECM can report DTC P013A, or P013C failed, DTCs P013E, P014A,
P2270, and
P2272 must run and pass.
- Before the ECM can report DTC P013E, or P014A failed, DTCs P2270 and
P2272 must run and
pass.
- DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107,
P0108, P0120, P0121,
P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B,
P013E,
P013F, P0140, P0141, P0171, P0172, P0201 - P0208, P0220, P0222, P0223, P0300
- P0308,
P0442, P0443, P0446, P0449, P0455, P0496, P1174, P1516, P2101, P2119, P2135,
P2176, P2270,
P2271 are not set.
- The Ignition voltage is between 10 - 32 V.
- The engine is OFF for greater 8 h.
- The learned heater resistance is valid.
- The fuel level is greater than 10%.
- After the above conditions are met decel fuel cut-off continues without
driver initiated pedal input.
- The DTCs run once per ignition cycle, during decel fuel cut-off (DFCO),
when the above
conditions are met.
P013B or P013F
- Before the ECM can report DTC P013B, or P013D failed, DTCs P013A, P013C,
P013E, P013F,
P014A, P014B, P2270, P2271, P2272, and P2273 must run and pass.
- Before the ECM can report DTC P013F, or P014B failed, DTCs P013A, P013C,
P013E, P014A,
P2270, P2271, P2272, and P2273 must run and pass.
- DTCs P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107,
P0108, P0120, P0121,
P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B,
P013E,
P013F, P0140, P0141, P0171, P0172, P0201 - P0208, P0220, P0222, P0223, P0300
- P0308,
P0442, P0443, P0446, P0449, P0455, P0496, P1174, P1516, P2101, P2119, P2135,
P2176, P2270,
P2271 are not set.
- The Ignition voltage is between 10 - 32 V.
- The engine is OFF for greater 8 h.
- The learned heater resistance is valid.
- The fuel level is greater than 10%.
- After the above conditions are met, fuel enrich mode is continued.
- The DTCs run once per ignition cycle when the above conditions are met.
P2270
P2271
- DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113,
P0116, P0117, P0118,
P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172,
P0201,
P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174,
P1516, P2101,
P2119, P2135, P2176, P2270 are not set.
- The system voltage is between 10 - 32 V.
- The engine is OFF for greater 8 h.
- The fuel level is greater than 10%.
- The fueling state is in Closed Loop.
- DTCs P013A, P013E, and P2270 have run and passed.
- Decel fuel cut-off is active.
- The accelerator pedal position is stable.
- This DTC runs once per trip when the above conditions are met for 3 s.
Conditions for Setting the DTC
P0137
The engine control module detects that the heated oxygen sensor voltage is
less than 50 mV and the
circuit is shorted to ground for greater than 50 s.
P0138
The engine control module detects that the heated oxygen sensor voltage is
greater than 1, 050 mV and
the circuit is shorted to voltage for greater than 13 s.
P013A
The engine control module detects that the accumulated mass air flow
monitored during rich-to-lean
transitions between 450 - 150 mV is greater than 36 grams.
P013B
The engine control module detects that the accumulated mass air flow
monitored during lean-to-rich
transitions between 300 - 600 mV is greater than 88 grams.
P013E
The engine control module detects an initial delayed response to a change
from rich to lean such that the
heated oxygen sensor voltage has not decreased to 450 mV within a calibrated
value of accumulated air
flow.
P013F
The engine control module detects an initial delayed response to a change
from lean to rich such that the
heated oxygen sensor voltage has not increased above 350 mV within a calibrated
value of accumulated
air flow.
P2270
The engine control module does not detect a heated oxygen sensor voltage
greater than 825 mV before
accumulated mass air flow exceeds a calibrated value.
P2271
The engine control module does not detect an heated oxygen sensor voltage
less than 100 mV before
accumulated mass air flow exceeds a calibrated value.
Action Taken When the DTC Sets
- DTCs P0137, P0138, P013E, P013F, P2270, and P2271 are Type B DTCs.
- DTCs P013A and P013B are Type A DTCs.
Conditions for Clearing the MIL/DTC
- DTCs P0137, P0138, P013E, P013F, P2270, and P2271 are Type B DTCs.
- DTCs P013A and P013B are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Wiring Schematics (LTG)
Connector End View Reference
Component Connector End View Index
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify no HO2S heater DTCs are set.
Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- Go to next step: If a DTC is not set.
3. Engine running.
4. Verify the scan tool HO2S 1 or 2 parameters are between 50 - 1, 050 mV.
- If not between 50 - 1, 050 mV.
Refer to Circuit/System Testing.
- Go to next step: If between 50 - 1, 050 mV.
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.
6. Verify the DTC does not set.
Refer to Circuit/System Testing.
- Go to next step: If the DTC does not set.
7. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the appropriate B52
Heated Oxygen Sensor
harness connector. It may take up to 2 minutes for all vehicle systems to power
down. Ignition
ON.
2. Test for 1.7 - 3.0 V between the high signal circuit terminal 4 and ground.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for infinite resistance between the high signal circuit terminal 4
and ground.
- If less than infinite resistance repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the high signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K20 Engine Control Module.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module, ignition
ON.
- Test for less than 1 V between the high signal circuit terminal 4 and
ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- Go to next step: If between 1.7 - 3.0 V
3. Verify the scan tool HO2S 2 parameter is between 1.7 - 2.1 V.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for infinite resistance between the low signal circuit terminal 3
and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance, replace the K20 Engine
Control Module.
- Go to next step: If between 1.7 - 2.1 V
4. Connect a 3 A fused jumper wire between the high signal circuit terminal 4
and the low signal
circuit terminal 3.
NOTE: The low signal circuit is tied to a pull-up circuit within the
engine
control module. A voltage of 0.0 - 1.10 V on the low signal circuit is
normal.
5. Verify the scan tool HO2S 1 or 2 parameter displays 0.0 V.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module, ignition
ON.
- Test for less than 2 Ω in the low signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
- Test for less than 1 V between the low signal circuit terminal 3 and
ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- Go to next step: If 0.0 V
6. Verify none of the conditions listed below exist:
- Water intrusion in the B52 Heated Oxygen Sensor harness connector
- Low or high fuel system pressure - Refer to Fuel System Diagnosis.
- Fuel that is contaminated - Refer to Alcohol/Contaminants-in-Fuel
Diagnosis.
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks
- Engine vacuum leaks
- Engine oil consumption - Refer to Oil Consumption Diagnosis.
- Engine coolant consumption - Refer to Loss of Coolant.
- If any of the conditions exist
Repair as necessary.
- Go to next step: If none of the conditions exist
Go to next step: Test or replace the B52 Heated Oxygen Sensor
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Heated Oxygen Sensor Replacement - Sensor 1
- Heated Oxygen Sensor Replacement - Sensor 2
- Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after
replacing an HO2S.
- Control Module References for ECM replacement, programming and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
POWER STEERING SYSTEM DESCRIPTION AND OPERATION (ELECTRONIC POWER
STEERING)
K43 - K43 Power Steering Control Module
K17 - K17 Electronic Brake Control Module
P16 - P16 Instrument Cluster
B137 - B137 Power Steering Shaft Torque Sensor
M38 - M38 Power Steering Motor
The power steering system consists
Rear-Facing Infant Restraint
A rear-facing child restraint provides
restraint with the seating surface
against the back of the infant.
The harness system holds the infant
in place and, in a crash, acts to
keep the infant positioned in the
restraint.
Forward-Facing Child Restraint
A forward-facing