P2084 moderate

Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2)

The P2084 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2). This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$100 - $400 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • EGT reads lower than expected
  • DPF regen may not complete
  • Possible power reduction
  • Exhaust odor from incomplete regen

Probable Causes (Ranked by Likelihood)

  • Short to ground in EGT sensor 2 circuit Very High
  • Failed sensor with low resistance High
  • Wiring melted near exhaust Moderate
  • ECM input circuit fault Low

Step-by-Step Diagnostic Procedure

  1. Measure EGT sensor 2 signal voltage

  2. Inspect wiring for heat damage or shorts

  3. Check sensor resistance

  4. Replace sensor if confirmed faulty

Frequently Asked Questions

What does P2084 indicate?

P2084 indicates: Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2). The ECM detected an issue requiring diagnosis.

Is P2084 urgent?

Moderate priority. Schedule a repair.

What should I check first?

Start with a visual inspection of the sensor wiring and connector. Then use a scan tool to read live data and compare to expected values. A multimeter can verify sensor resistance and circuit integrity.

Sources

This page is built from documented references. Verify against your own service info before repair work.

P2084 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:

Duramax moderate Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2

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