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P2210 — Nox Sensor Heater Sense Circuit Low Bank 1 Sensor 1

Manufacturer-specificPowertrain (engine & transmission)

P2210 indicates a low voltage condition in the heater circuit of the NOx sensor (Bank 1, Sensor 1). The power supply or control signal to the sensor’s heater is not reaching the expected level.

Symptoms

What causes it — most likely first

1. Faulty NOx sensor heater element

The heater coil inside the NOx sensor can burn out, causing low resistance and insufficient voltage.

2. Wiring harness damage or poor connection

Corroded, cracked, or loose wires or connectors in the heater circuit can create high resistance and drop voltage.

3. Heater circuit fuse or fusible link blown

A failed fuse or fusible link in the heater supply line will cut power to the sensor heater.

4. Faulty heater control driver in the powertrain control module (PCM)

A malfunctioning output stage in the PCM can limit voltage to the heater circuit, though this is less common than component or wiring issues.

How it's diagnosed

  1. Verify the stored code and clear it to see if it returns after a drive cycle.
  2. Inspect the NOx sensor heater wiring and connectors for corrosion, damage, or looseness; repair as needed.
  3. Measure heater circuit voltage at the sensor with the engine running and at coolant temperature; compare to specification.
  4. Check the relevant fuse or fusible link for continuity and correct rating.
  5. If voltage and wiring are correct, test the heater resistance of the sensor; replace the sensor if out of spec.
  6. Only after confirming sensor and wiring are good should the PCM heater driver be evaluated, typically by a professional scan tool.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2208 — Nox Sensor Heater Sense Circuit Bank 1P2209 — Nox Sensor Heater Sense Circuit RangepP2211 — Nox Sensor Heater Sense Circuit High BP2212 — Nox Sensor Heater Sense Circuit IntermP2213 — Nox Sensor Circuit Bank 2P2214 — Nox Sensor Circuit Rangeperformance Ba

Frequently asked

Can the PCM be the cause of a P2210 code?

Yes, but it is rare. The PCM’s heater driver can fail, but most cases are due to the sensor, wiring, or fuse.

Do I need to replace the NOx sensor immediately?

If the heater circuit voltage is low and the sensor resistance is out of spec, replacement is necessary to restore proper emissions control.

Will fixing a wiring issue clear the code?

Repairing damaged wires or connectors and restoring proper voltage usually resolves the code; after repair, clear the code and test drive to confirm.

Why do some sources recommend replacing the PCM for P2210?

Because the PCM controls the heater circuit, some technicians assume it is at fault. In practice, sensor or wiring problems are far more common, so PCM replacement should be a last resort after all other diagnostics.