NOx Trap Efficiency Below Threshold (Bank 1)
The P2000 code means the vehicle's onboard diagnostic system has detected: NOx Trap Efficiency Below Threshold (Bank 1). This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $800 - $2,500 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P2000?
- Check Engine Light illuminated
- Reduced engine power
- Increased fuel consumption
- Strong sulfur or rotten egg smell from exhaust
- Failed emissions test
What Causes P2000? (Most Likely First)
- Degraded or poisoned NOx trap catalyst Very High
- Sulfur contamination from high-sulfur fuel High
- Exhaust leak upstream of NOx trap Moderate
- Faulty NOx sensor Moderate
- PCM software needs update Low
Can I Still Drive with P2000?
Short distances only. P2000 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2000 mean?
P2000 indicates that the NOx trap on Bank 1 is not converting nitrogen oxides efficiently enough, meaning the catalyst is failing to meet emission reduction thresholds.
Can I drive with a P2000 code?
You can drive short distances, but the vehicle may enter reduced power mode and will fail emissions testing. Have it diagnosed promptly to avoid catalytic converter damage.
How much does it cost to fix P2000?
Repairs typically cost $800 to $2,500, with NOx trap replacement being the most expensive scenario. Sometimes a NOx sensor replacement at $200-$400 resolves the issue.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2000?
-
Read freeze frame data and confirm P2000 is stored
-
Inspect NOx trap catalyst for physical damage or contamination
-
Test upstream and downstream NOx sensors for proper readings
-
Check for exhaust leaks between engine and NOx trap
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
P2000 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P2000?
- 2010-2016 Mercedes-Benz ML350 3.0L BlueTEC
- 2014-2020 Ram 3500 6.7L Cummins
- 2011-2017 Ford F-350 6.7L Power Stroke
- 2012-2019 Chevrolet Silverado 3500 6.6L Duramax
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.