What Does Engine Code P2BAC Mean?

If your car is showing a P2BAC engine code, you’re dealing with issues related to your NOx levels.
Written by Preston Charles
Reviewed by Melanie Reiff
If your car is showing a P2BAC engine code, then you’re likely dealing with issues related to your NOx levels. This can cause black smoke to emit from your exhaust or a sudden drop in fuel economy. If you want to maintain smooth functioning and get the most miles per gallon, then you should get this issue looked at ASAP. 
DTCs, or Diagnostic Trouble Codes, can give you a better insight into what’s happening below the hood. If you have an OBD-II code reader, it’s vital to know the meaning behind the various codes that register on the reader so as to properly address the problem. 
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What does the engine code P2BAC mean?

The P2BAC engine code signifies the deactivation of your EGR (Exhaust Gas Recirculation) and NOx (nitrogen oxide) exceedance
The deactivated EGR is set in motion by the detection of NOx in the exhaust gas that exceeds the allowable threshold level. This code only applies to automobiles that are fitted with an EGR system. 

How much will it cost to diagnose?

Depending on the make and model of your car, diagnosing the P2BAC engine code typically takes around an hour, with the average labor cost coming in at around $75 to $150 an hour

What can cause the P2BAC engine code?

There are a few different factors that could cause the P2BAC engine code to be set off, and most of them pertain to the NOx system in your car. Here are some possible culprits:
  • A faulty NOx sensor
  • A NOx sensor harness that is open or shorted
  • NOx sensor circuit with a poor electrical connection
  • A faulty Diesel Particulate Filter (DPF)
  • Faulty
    EGR valve

Common symptoms of the P2BAC engine code

First and foremost, is your
Check Engine Light on
? That’s the most common indicator, but there are other symptoms to be on the lookout for as well.
  • ECM indicating the stored error code
  • Exponential increase in the fuel consumption pattern
  • Rough engine with occasional stalling
  • Lack of power and acceleration due to failure of fuel delivery system
  • Black or white smoke coming from the tailpipe
 MORE: How to pass emissions testing

How serious is the P2BAC engine code?

Will your car still function with a P2BAC engine code? Sure, but it’s not ideal and shouldn’t be pushed. 
In the near future, you’ll lose power while also suffering at the gas station—a most unfortunate double whammy! Over time, this problem can do serious damage to your engine, as well. 

Can I fix the issue myself?

You can! However, due to the various possible malfunctions, it might not be the easiest of fixes. Start by visually inspecting the related wiring harness and connectors. Next, check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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