P015C
DTC P0133, P013A-P013F, P014A, P014B, P0153, P015A, P015B, P015C, or P015D (without L96)
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 provides an overview of each diagnostic category.
DTC Descriptors
DTC P0133
- HO2S Slow Response Bank 1 Sensor 1
DTC P013A
- HO2S Slow Response Rich to Lean Bank 1 Sensor 2
DTC P013B
- HO2S Slow Response Lean to Rich Bank 1 Sensor 2
DTC P013C
- HO2S Slow Response Rich to Lean Bank 2 Sensor 2
DTC P013D
- HO2S Slow Response Lean to Rich Bank 2 Sensor 2
DTC P013E
- HO2S Delayed Response Rich to Lean Bank 1 Sensor 2
DTC P013F
- HO2S Delayed Response Lean to Rich Bank 1 Sensor 2
DTC P014A
- HO2S Delayed Response Rich to Lean Bank 2 Sensor 2
DTC P014B
- HO2S Delayed Response Lean to Rich Bank 2 Sensor 2
DTC P0153
- HO2S Slow Response Bank 2 Sensor 1
DTC P015A
- HO2S Delayed Response Rich to Lean Bank 1 Sensor 1
DTC P015B
- HO2S Delayed Response Lean to Rich Bank 1 Sensor 1
DTC P015C
- HO2S Delayed Response Rich to Lean Bank 2 Sensor 1
DTC P015D
- HO2S Delayed Response Lean to Rich Bank 2 Sensor 1
Diagnostic Fault Information
Circuit/System Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The control module supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the control module operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,275 mV that fluctuates above and below the bias voltage. A high HO2S voltage indicates a rich exhaust stream. A low HO2S voltage indicates a lean exhaust stream.
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
P0133 or P0153
* DTC 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 or P2176 is not set.
* The ignition voltage is between 10-32 V.
* The engine coolant temperature (ECT) is warmer than 50°C (122°F).
* The intake air temperature (IAT) is warmer than -40°C (-40°F).
* The fuel level is greater than 10 percent.
* The engine run time is greater than 120 s.
* The engine speed is between 1,200-3,000 RPM.
* The barometric (BARO) pressure is greater than 70 kPa.
* The mass airflow (MAF) is between 20-55 g/s.
* The fuel system is in Closed Loop.
* Ethanol content is less than 87 percent.
* The fuel control state is not in power enrichment.
* Decel fuel cut off is not active.
* The DTCs run once per drive cycle when the above conditions are met for greater than 3.5 s.
P013A P013C, P013E, P014A, P015A, or P015C
* Before the ECM can report DTC P013E, or P014A failed, DTCs P2270 and P2272 must run and pass.
* Before the ECM can report DTC P013A, or P013C failed, DTCs P013E, P014A, P2270, and P2272 must run and pass.
* DTC 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, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1174, P1175, P1516, P2101, P2119, P2135, P2176, P2270, P2271 or P2A00 is not set.
* The ignition voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The accelerator pedal (APP) is steady.
* Decel fuel cut-off is continued without driver input after the above conditions are met.
* The DTCs run once per ignition cycle, during decel fuel cut-off (DFCO), when the above conditions are met.
P013B P013D, P013F, P014B, P015B or P015D
* Before the ECM can report DTC P013F, or P014B failed, DTCs P2271, P2273, P013A, P013C, P013E, P014A, P2270, and P2272 and must run and pass.
* Before the ECM can report DTC P013B or P013D failed, DTCs P013F, P014B, P2271, P2273, P013A, P013C, P013E, P014A, P2270, and P2272 and must run and pass.
* DTC 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, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0455, P0496, P1174, P1175, P1516, P2101, P2119, P2135, P2176, P2270, P2271 or P2A00 is not set.
* The ignition voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* Fuel enrich mode continues after the above conditions are met.
* The DTCs run once per ignition cycle when the above conditions are met.
Conditions for Setting the DTC
P0133 or P0153
* The ECM detects that the HO2S 1 rich-to-lean or lean-to-rich average response time is greater than a calibrated value.
* The DTCs set within 100 s when the above condition is met.
P013A or P013C
The ECM detects that the HO2S 2 has a slow response when the accumulated mass air flow monitored during rich-to-lean transitions between 500-200 mV is greater than a calibrated value.
P013B or P013D
The ECM detects that the HO2S 2 has a slow response when the accumulated mass air flow monitored during lean-to-rich transitions between 350-650 mV is greater than a calibrated value.
P013E or P014A
The ECM detects that the HO2S 2 sensor has an initial delayed rich-to-lean response when the voltage has not decreased below 500 mV within a calibrated value of accumulated air flow.
P013F or P014B
The ECM detects that the HO2S 2 sensor has an initial delayed lean-to-rich response when the voltage has not increased above 350 mV within a calibrated value of accumulated air flow.
P015A or P015C
The ECM detects that the HO2S 1 sensor has an initial delayed rich-to-lean response when the voltage has not decreased below 550 mV within a calibrated value of accumulated air flow.
P015B or P015D
The ECM detects that the HO2S 1 sensor has an initial delayed lean-to-rich response when the voltage has not increased above 350 mV within a calibrated value of accumulated air flow.
Action Taken When the DTC Sets
* DTCs P0133, P013E, P013F, P014A, P014B, P0153 are Type B DTCs.
* DTCs P013A, P013B, P013C, P013D, P015A, P015B, P015C, and P015D are Type A DTCs.
Conditions for Clearing the DTC
* DTCs P0133, P013E, P013F, P014A, P014B, P0153 are Type B DTCs.
* DTCs P013A, P013B, P013C, P013D, P015A, P015B, P015C, and P015D are Type A DTCs.
Diagnostic Aid
The following diagnostics are run in sequence while the vehicle is in decel cut-off:
* HO2S Bank 1 Sensor 2: P2270, P013E, P013A, P2271.
* HO2S Bank 2 Sensor 2: P2272, P014A, P013C, P2273.
* At the same time, after P2270 and P2272 run and pass, diagnostics for P015A and P015C are also running. Any accelerator input will stop the tests, causing the sequence to start over.
After the above tests run and pass, the following diagnostics are run in sequence and are not affected by accelerator pedal input:
* HO2S Bank 1 Sensor 2: P013F, P013B.
* HO2S Bank 2 Sensor 2: P014B, P013D.
* At the same time, diagnostics for P015B and P015D are also running.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
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
* Wiring Repairs 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. Ignition ON, observe the DTC information with a scan tool. Verify no HO2S heater DTCs are set.
• If a HO2S heater DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Verify none of the following conditions exist:
* Lean or rich fuel injectors-Refer to Fuel Injector Diagnosis (CH47976) Fuel Injector Diagnosis (CH47976)Fuel Injector Diagnosis (J39021 or Scan Tool) Fuel Injector Diagnosis (J39021 or Scan Tool)
* Water intrusion in the HO2S harness connector
* Low or high fuel system pressure-Refer to Fuel System Diagnosis (Without FPCM) Component Tests and General DiagnosticsFuel System Diagnosis (FPCM) Component Tests and General Diagnostics
* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis 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 Oil Consumption Diagnosis
* Engine coolant consumption-Refer to Loss of Coolant Loss of Coolant
• If you find any of the above conditions, repair as necessary.
3. If all conditions test normal, test or replace the appropriate B52 Heated Oxygen Sensor.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) Service and Repair
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) Service and Repair
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) Service and Repair
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) Service and Repair
* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
* Control Module References Control Module References for ECM replacement, programming and setup.