Intake Manifold Air Temperature Sensor Circuit (Bank 2)
The P2078 code means the vehicle's onboard diagnostic system has detected: Intake Manifold Air Temperature Sensor Circuit (Bank 2). This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $40 - $200 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Slightly rough idle
- Minor fuel economy decrease
- Engine may run slightly rich or lean
- No severe symptoms
Probable Causes (Ranked by Likelihood)
- Failed Bank 2 intake air temperature sensor Very High
- Damaged wiring to Bank 2 sensor High
- Corroded Bank 2 sensor connector Moderate
- ECM Bank 2 input circuit fault Low
Step-by-Step Diagnostic Procedure
-
Read Bank 2 air temp on scan tool and compare to Bank 1
-
Inspect Bank 2 sensor wiring
-
Measure Bank 2 sensor resistance
-
Replace Bank 2 sensor if readings differ significantly from Bank 1
Frequently Asked Questions
What does P2078 mean?
P2078 indicates: Intake Manifold Air Temperature Sensor Circuit (Bank 2). The ECM has detected an issue with this sensor or circuit.
Is P2078 serious?
Moderately serious. Schedule a repair soon.
Can I diagnose this myself?
Basic diagnosis is possible with a scan tool and multimeter. Check wiring, connector condition, and sensor readings. Compare data to manufacturer specifications.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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