What Does P2183 Mean?
The PCM has detected that Engine Coolant Temperature Sensor 2 (ECT2) readings are implausible compared to ECT1 or other engine parameters. The sensor may be reading values that don't correlate with actual engine operating conditions.
Common Causes
45%
Failed or degraded ECT sensor 2
25%
Corroded or loose connector at ECT sensor 2
20%
Thermostat stuck open or failed causing erratic coolant temps
10%
PCM internal fault or software calibration issue
Diagnostic Steps
1
Step 1: Locate ECT sensor 2 (typically in radiator outlet or secondary coolant passage) and inspect connector for corrosion or damage
2
Step 2: Monitor live data comparing ECT1 and ECT2 readings at cold start and during warm-up; they should track within 10-15°F of each other
3
Step 3: Measure sensor resistance with engine cold and hot, compare to manufacturer specs (typically 2000-3000 ohms cold, 200-300 ohms hot)
4
Step 4: Check sensor ground circuit continuity and signal wire for high resistance or shorts to voltage
5
Step 5: If sensor and circuits test good, verify thermostat operation and coolant flow, then consider PCM issue
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The PCM has detected that Engine Coolant Temperature Sensor 2 (ECT2) readings are implausible compared to ECT1 or other engine parameters. The sensor may be reading values that don't correlate with actual engine operating conditions.
The most common cause of P2183 (Engine Coolant Temperature Sensor 2 Circuit Range/Performance) is: Failed or degraded ECT sensor 2
Typical repair costs for P2183 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive short distances but may experience poor fuel economy, rough idle, or inadequate heating. Extended driving may cause engine to run too rich or lean.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2183 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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