What Does P1114 Mean?
P1114 indicates the Engine Coolant Temperature (ECT) sensor circuit is producing an intermittent low voltage signal, or alternatively the secondary Intake Air Temperature B circuit has a low input. An intermittent low voltage on the ECT circuit makes the ECM think the engine is extremely hot when it may not be, causing rich cold-start fueling corrections to be removed prematurely. This can lead to cold stalling, poor warm-up performance, and erratic fan operation.
Common Causes
30%
Intermittent short to ground in the ECT sensor signal wire
25%
ECT sensor with intermittent internal short producing low resistance
20%
Corroded ECT sensor connector allowing moisture-induced shorts
15%
IAT-B sensor (secondary intake temp) signal shorted low
10%
Coolant leak contaminating the ECT sensor connector
Diagnostic Steps
1
Step 1: Monitor ECT sensor reading with a cold engine. The value should match ambient temperature initially and rise smoothly. If it sporadically jumps to an unrealistically high temperature, the circuit is intermittently shorted low.
2
Step 2: Disconnect the ECT sensor and measure its resistance. At room temperature (~70°F) expect approximately 2,000–3,000 ohms. If normal when static but the fault is intermittent, the connector or wiring is suspect.
3
Step 3: Inspect the ECT sensor connector for coolant contamination, corrosion, or green/white deposits. Clean thoroughly or replace the connector if damaged.
4
Step 4: Wiggle the ECT sensor wiring and connector while monitoring live data. A sudden voltage drop during the wiggle test identifies the intermittent connection point.
5
Step 5: If the vehicle has a secondary IAT-B sensor, check that circuit independently using the same resistance and voltage tests.
6
Step 6: Replace the ECT sensor if intermittent internal shorts are confirmed. Ensure the new sensor has proper thread sealant and torque to specification.
Estimated Repair Cost
$30 - $200
Parts + labor, varies by vehicle and location
P1114 indicates the Engine Coolant Temperature (ECT) sensor circuit is producing an intermittent low voltage signal, or alternatively the secondary Intake Air Temperature B circuit has a low input. An intermittent low voltage on the ECT circuit makes the ECM think the engine is extremely hot when it...
The most common cause of P1114 (Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input) is: Intermittent short to ground in the ECT sensor signal wire
Typical repair costs for P1114 range from $30 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An incorrect ECT reading may prevent the cooling fan from activating properly, risking engine overheating. It may also cause inappropriate cold-enrichment removal, leading to cold stalling in traffic.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1114 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Cooling System Monitoring
Difficulty
Type
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