P2217 moderate

NOx Sensor Heater Circuit High (Bank 2)

The P2217 code means the vehicle's onboard diagnostic system has detected: NOx Sensor Heater Circuit High (Bank 2). This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: hard
Estimated cost: $250 - $800 (parts and labor)

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Common Symptoms

Check Engine Light on
Possible burning smell from wiring
Failed emissions test
SCR system warning
Potential limp mode

Probable Causes (Ranked by Likelihood)

Short to voltage in the Bank 2 heater circuit wiring Very High
Internally shorted Bank 2 NOx sensor heater element High
Water intrusion causing a short in the Bank 2 connector Moderate
Melted wiring near exhaust components on Bank 2 Moderate
ECM heater driver outputting excessive current on Bank 2 Low

Step-by-Step Diagnostic Procedure

Measure Bank 2 heater circuit current draw and compare to spec
Inspect wiring for shorts to power near exhaust heat sources
Check the Bank 2 sensor connector for water intrusion or melted pins
Measure heater element resistance -- very low reading indicates internal short
Replace the Bank 2 NOx sensor if heater element is shorted

Frequently Asked Questions

What does high circuit mean for the Bank 2 heater?

It means excessive current is flowing through the Bank 2 NOx sensor heater circuit, usually from a short to voltage in the wiring or an internally shorted heater element with abnormally low resistance.

Can excessive heater current blow a fuse?

Yes, if the heater circuit is shorted, the excess current can blow the heater fuse. If you find a blown fuse, check for shorts before replacing it.

How do I protect the wiring from exhaust heat?

Ensure all heat shields and wire loom protection are in place. Damaged or missing heat shielding should be replaced to prevent the wiring harness from being exposed to excessive exhaust temperatures.