P2216
System
Powertrain (Diesel Emissions)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

NOx Sensor Positive Current Control Circuit Open (Bank 2 Sensor 1)

Understand P2216, common causes, and the right TOPDON scanner to diagnose it.

Bank 2 NOx positive current circuit open.

Common symptoms

  • SCR bank 2 fault
  • Warning lamps

Typical causes

  • Failed sensor
  • Open wire
  • Unplugged connector after exhaust service

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose P2216 with a basic code reader?
P2216 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P2216?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.