AutoCodes
 
OBDII Code List
 
P11B5 CHEVROLET

P11B5 CHEVROLET - HO2S Current Performance Bank 1 Sensor 2

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

P11B5 CHEVROLET Possible Causes

  • Faulty Heated Oxygen Sensor (HO2S)
  • Heated Oxygen Sensor (HO2S) harness is open or shorted
  • Heated Oxygen Sensor (HO2S) circuit poor electrical connection

First diagnose P11B5 CHEVROLET code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P11B5 CHEVROLET code

    Labor: 1.0

    The cost of diagnosing the P11B5 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

P11B5 CHEVROLET Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P11b5 Chevrolet Description

The reductant system uses two Nitrogen Oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located between the Selective Catalytic Reduction (SCR) and the Diesel Particulate Filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the Engine Control Module (ECM) with information on the exhaust oxygen level during DPF regeneration.

Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust.

The ECM varies the amount of Diesel Exhaust Fluid (DEF) or reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.

The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

OBDII Code P11b5 Chevrolet - HO2S Current Performance Bank 1 Sensor 2 - AutoCodes.com

P11B5 CHEVROLET More Information

Need more information on how to fix the P11B5 CHEVROLET code?
Get Access to Factory Service Manuals

Need more help?

Get the P11b5 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Related Information

P11B5 CHEVROLET Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P11b5 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧