Chevrolet P11DB: NOx Sensor 1 Current Performance

What Does The Chevrolet P11DB Code Mean?

The exhaust temperature sensor 2 is greater than 95°C (203° F). The engine speed is greater than 600 RPM. The battery voltage is greater than 11 V. The DPF regeneration is not active. The DTCs run continuously when the above conditions are met.

What Are The Potential Causes Of The Chevrolet P11DB Code?

• The ECM receives a serial data message from the NOx Sensor Module that the NOx ratio of valid to invalid feedback is greater than a predetermined amount for greater than 5 s.

How Can You Fix The Chevrolet P11DB Code?

If the sensor is found to be damaged, replace the NOx 2 sensor.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Dorman 904-421 Nitrogen Oxide (NOx) Sensor

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

Reference Sources

• GM, 2012, Service Bullettin – Instrument Panel Cluster (IPC) Warning Lamps and/or MIL are Illuminated, Diesel Exhaust Fluid (DEF)
  Message Displayed, Various DTCs Set, Transmission May Not Shift or Defaults to Second Gear (Inspect
  Wiring Harnesses for Chafing, Connectors Not Fully Seated, and Backed Out or Damaged Terminals,
  Repair as Needed).
• GM, 2011, Service Bullettin – Instrument Panel Cluster (IPC) Warning Lamps and/or MIL are Illuminated, Diesel Exhaust Fluid (DEF)
  Message Displayed, Various DTCs Set, Transmission May Not Shift or Defaults to Second Gear (Inspect
  Wiring Harnesses for Chafing, Connectors Not Fully Seated, and Backed Out or Damaged Terminals,
  Repair as Needed).
• GM, 2020, Service Bullettin – N192291610 – Special Coverage
  NOx Sensor Coating Peeling Off.
• GM, 2020, Service Bullettin – SES MIL / Reduced Engine Power / Misre / IPC Gauges
  Sweep / IPC Warning Message / Loss Communication / Various
  DTCs / Blown Fuse (Inspect Engine Harness 3.0L Diesel).
• GM, 2020, Service Bullettin – Malfunction Indicator Lamp (MIL) Illuminated – DTC P0421, P0422, P0480, P119E,
  P11D0, P11DB, P11DC, P11FC, P20EE, P220B, P22A0, , P22A2, P22A3 and/or P24A0 Set.