Engine Coolant Temperature Sensor 2 Circuit Low
The P2184 code means the vehicle's onboard diagnostic system has detected: Engine Coolant Temperature Sensor 2 Circuit Low. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $50 - $200 (parts and labor)
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What Are the Symptoms of P2184?
- Check Engine Light on
- CTS 2 reads very high temperature
- Fan may run constantly
- Engine management uses CTS 1 instead
- No severe drivability issues
What Causes P2184? (Most Likely First)
- Short to ground in CTS 2 circuit Very High
- Failed CTS 2 with low resistance High
- Wiring shorted near engine block Moderate
- ECM CTS 2 input shorted Low
Can I Still Drive with P2184?
Yes, but fix soon. P2184 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
What does P2184 mean?
P2184 indicates: Engine Coolant Temperature Sensor 2 Circuit Low. The ECM has identified an abnormal condition that needs attention.
Can I drive with P2184?
Yes, but repair soon for optimal performance.
What is the most common fix?
The most common fix depends on the root cause. Start with basic checks like vacuum leaks, sensor conditions, and fluid levels before replacing components.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2184?
-
Measure CTS 2 signal voltage
-
Check wiring for shorts to ground
-
Measure CTS 2 resistance
-
Disconnect CTS 2 and verify code changes to high
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2184?
- 2010-2020 Toyota Camry 2.5L
- 2012-2019 Honda Civic 2.0L
- 2008-2018 Ford F-150 5.0L
- 2011-2019 Hyundai Sonata 2.4L
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