Emissions

P2210 — NOx Sensor Positive Current Control Circuit Low (Bank 1 Sensor 1)

Severity: medium Drive with care, to a shop

What P2210 means

The engine control module monitors the positive current control circuit of the bank 1, sensor 1 nitrogen oxide (NOx) sensor. This sensor measures NOx in the exhaust, and the emissions system, such as SCR with diesel exhaust fluid, uses that data to dose properly. When the circuit reads lower than expected, the module sets P2210 and turns on the check engine light.

Symptoms

  • Check engine light on
  • Reduced power or engine derate
  • Higher emissions and possible inspection failure
  • Exhaust treatment system warning messages
  • Possible increased fuel or fluid use

Possible causes

  1. Failed NOx sensor
  2. Wiring shorted to ground in the sensor circuit
  3. Damaged or corroded sensor connector
  4. Faulty NOx sensor control module or module driver
  5. Wiring harness damaged by heat or chafing
  6. Low supply voltage to the sensor

How to diagnose

  1. Scan all codes and freeze frame data, and look for other NOx or SCR codes.
  2. Inspect the sensor harness and connector for chafing, heat damage, moisture and corrosion.
  3. Check sensor power and ground with a multimeter per the factory wiring diagram.
  4. Test the signal wires for a short to ground and for opens.
  5. Check the sensor control module (if separate) and its connector.
  6. Compare live NOx sensor data with the engine off and when warm.
  7. If wiring tests good, replace the sensor, clear the code and confirm it does not return.

Common fixes

  • Replace the NOx sensor
  • Repair or replace the damaged wiring harness
  • Clean or replace the connector
  • Replace the NOx sensor control module
  • Apply a PCM software update if the manufacturer offers one

Questions and answers

What does P2210 mean?

It means the bank 1 NOx sensor positive current control circuit is reading low. The usual causes are a bad sensor or wiring shorted to ground.

Can I drive with P2210?

For a short time, yes, but power may be limited and emissions can increase. Get it checked soon.

Do I always need a new NOx sensor?

No. Check the wiring, connector and power supply first, since the sensor is costly and the fault may be a simple short.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.