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2013 Chevy Avalanche Engine 5.3 Having 02 issues

rudf

By rudf
in Ask A GM Technician

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rudf New Member

rudf

Posted
Posted

I have changed all coil packs, plugs and wires. and Oxygen sensors also the 02's were aftermarket and not OEM what could be my issues with all these codes (not to Worried about Oil Pressure switch)  all wiring to 02 sensor including voltage seems to be good . Thanks in advance for any or all help. 

 

 

Car Scanner ELM OBD2
DTC report
Selected brand: Chevrolet
VIN: 3GNTKFE79DG292059
 
============1==============
P0050
Raw code: 0050
ECU: Engine control unit
Status: Confirmed
OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction
 
============2==============
P0056
Raw code: 0056
ECU: Engine control unit
Status: Confirmed
OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction
 
============3==============
P0155
Raw code: 0155
ECU: Engine control unit
Status: Confirmed
OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction
 
============4==============
P0157
Raw code: 0157
ECU: Engine control unit
Status: Confirmed
OBDII: Heated oxygen sensor (HO2S) 2, bank 2 - low voltage
 
============5==============
P0161
Raw code: 0161
ECU: Engine control unit
Status: Confirmed
OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction
 
============6==============
P0521
Raw code: 0521
ECU: Engine control unit
Status: Confirmed
OBDII: Engine oil pressure sensor/switch - range/performance problem
 
============7==============
P0151
Raw code: 0151
ECU: Engine control unit
Status: Pending
OBDII: Heated oxygen sensor (HO2S) 1, bank 2 - low voltage
 
============8==============
P015D
Raw code: 015D
ECU: Engine control unit[Archive (inactive)]
Status: Permanent
OBDII: Heated oxygen sensor (HO2S) 1, bank 2 - delayed response lean to rich
 
============9==============
P0174
Raw code: 0174
ECU: Engine control unit[Archive (inactive)]
Status: Permanent
OBDII: System too lean, bank 2
 
============10==============
P0050
Raw code: 0050
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Current DTC since power up, Warning Indicator Requested
OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction
General Electrical Failures [0x00]
============11==============
P0056
Raw code: 0056
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up, Warning Indicator Requested
OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction
General Electrical Failures [0x00]
============12==============
P0155
Raw code: 0155
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up, Warning Indicator Requested
OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction
General Electrical Failures [0x00]
============13==============
P0157
Raw code: 0157
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Current DTC since power up, Warning Indicator Requested
OBDII: Heated oxygen sensor (HO2S) 2, bank 2 - low voltage
General Electrical Failures [0x00]
============14==============
P0161
Raw code: 0161
ECU: Engine control unit
Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up, Warning Indicator Requested
OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction
General Electrical Failures [0x00]
============15==============
P0521
Raw code: 0521
ECU: Engine control unit
Status: DTC supported by calibration, Test failed since DTC cleared, History DTC, Current DTC since power up, Warning Indicator Requested
OBDII: Engine oil pressure sensor/switch - range/performance problem
General Electrical Failures [0x00]
============16==============
P0151
Raw code: 0151
ECU: Engine control unit
Status: DTC supported by calibration, Test failed since DTC cleared
OBDII: Heated oxygen sensor (HO2S) 1, bank 2 - low voltage
General Electrical Failures [0x00]
 

 

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Your answer is right there in the code description. "CIRCUIT MALFUNCTION" - that's not a mechanical problem - it's a circuit problem. You need to check the wiring from the plug to the ECM for a short.

rudf New Member

rudf

Posted
  • Author
Posted (edited)

Ok Thanks I checked that yesterday and found no issue and no shorts, but i will try to track it down a little more, is there a common ground to these? Also I am getting not short fuel trim on bank 2 sensor 2 on my reader; so another words flat lined  so no reading what could cause this. Thanks again. and do you have wiring diagram of the 02 sensor layout? 

Also I am getting good voltage according to my reader on bank 2 sensor 1&2

 

I also forgot I have snapon 12/24v test light and power probe will this help? 

 

 

Edited by rudf
Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted (edited)

Flat lined means either the sensor is completely dead, or wiring shorted, or blown fuse. As I said, betting on a shorted wire. Power Probe will easily find that. Power on one side, signal (lower varying voltage) on the other. If you've got no power, that'll flatline it too. That's fused power, labeled as such (usually).

 

Test light will work for testing the heater circuit (the 2 wires of the same color) - it's a pulse-width modulated (PWM) circuit, so you should see blinking / flickering of varying speed if that circuit is working. You'd have a code for that, though - your code is for the sensor wiring, not the heater circuit wiring, so I wouldn't worry about that yet.

Edited by Jsdirt

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