P0037
DTC P0030-P0032, P0036-P0038, P0053, P0054, P0135, or P0141
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.
Typical Scan Tool Data
Conditions for Running the DTC
P0030, P0031, P0032, P0036, P0037 and P0038
* The system voltage is between 11-32 V.
* The engine speed is greater than 400 RPM.
* The DTCs run continuously when the above conditions are met for greater than 5 s.
P0053 and P0054
* DTCs P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119 or P2610 are not set.
* The system voltage is less than 32 V.
* The ignition is OFF for greater than 8 h.
* The engine is running.
* The ECT is between -30 to +45°C (-22 to +113°F).
* The engine coolant temperature (ECT) and the intake air temperature (IAT) are within 8°C (14°F).
* The DTCs run once per valid cold start-up when the above conditions are met.
P0135 and P0141
* DTCs P0116, P0117, P0118, P0119 or P0128 are not set.
* The system voltage is between 10-32 V.
* The HO2S heaters are at operating temperature.
* The scan tool HO2S Heater device control is not active.
* The commanded HO2S heater duty cycle is greater than 0%.
* The DTCs run twice per drive cycle when the above conditions are met for greater than 30 s.
Conditions for Setting the DTC
P0030, P0031, P0032, P0036, P0037 and P0038
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.
P0053 and P0054
The ECM detects the HO2S heater is not within 7.5-13 ohms at engine start-up.
P0135 and P0141
The ECM detects the HO2S heater current is less than 0.30 A or greater than 2.5 A for greater than 8 s.
Action Taken When the DTC Sets
DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.
Diagnostic Aids
* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status parameters for the component. The circuit status parameters will change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.
* An open fuse in the HO2S heater circuit may be caused by the heater element in one of the sensors. The condition may not be present until the sensor operates for a period of time. If no fault is present in the heater circuit, monitor the amperage of each heater with a scan tool to determine if one of the heater elements is the cause of the open fuse. Inspect the sensor pigtail or the harness for contacting the exhaust system.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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. Engine idling, observe the control circuit status parameters listed below. The parameters should not display Malfunction.
* HO2S 1 or 2 Heater Control Circuit Open Test Status
* HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status
* HO2S 1 or 2 Heater Control Circuit High Voltage Test Status
2. Observe the scan tool HO2S 1 Heater or HO2S 2 Heater parameter. The amperage should be between 0.3-2.4 A.
3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. Or operate the vehicle within the conditions that are captured in the freeze frame/failure records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
3. Observe the scan tool HO2S 1 or 2 Heater Control Circuit Open Test Status parameter. The parameter should display Malfunction.
• If not the specified value, test the heater control circuit terminal 2 for a short to ground, or a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
4. Connect a 3 A fused jumper wire between the heater control circuit terminal 2 and ground. Observe the scan tool HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status parameter. The parameter should change from OK to Malfunction.
• If not the specified value, test the heater control circuit terminal 2 for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
5. Ignition OFF, connect a 10 A fused jumper wire between the heater control circuit terminal 2 and ignition voltage circuit terminal 1.
6. Engine running, observe the HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter. The parameter should transition from Not Run to Malfunction.
• If not the specified value, test the control circuit and the ignition voltage circuit for high resistance. If the circuits test normal, replace the K20 Engine Control Module.
7. If all circuits test normal, test or replace the B52 Heated Oxygen Sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor.
2. Test for 8-20 ohms between the ignition voltage circuit terminal 1 and the control circuit terminal 2.
• If not within the specified range, replace the B52 Heated Oxygen Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Heated Oxygen Sensor Replacement - Sensor 1 Heated Oxygen Sensor Replacement - Sensor 1
* Heated Oxygen Sensor Replacement - Sensor 2 Heated Oxygen Sensor Replacement - Sensor 2
* 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.