P1114
ChryslerEngine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input
Medium SeverityThis code indicates an intermittent low voltage signal from the Engine Coolant Temperature (ECT) sensor or the Intake Air Temperature (IAT) sensor to the engine computer. This typically results in the engine receiving incorrect information about its operating temperature, impacting fuel delivery and overall engine performance.
⚠️ Before You Begin (Safety First)
Always prioritize safety when working on your vehicle. Ensure the engine is cool before handling coolant or related components. Disconnect the battery's negative terminal before performing any electrical repairs to prevent accidental shorts or shocks. Wear appropriate personal protective equipment, including gloves and eye protection.
Common Symptoms
- Check Engine Light illuminated
- Poor fuel economy
- Engine running rich or lean
- Difficulty starting, especially when cold
- Engine may run rough or hesitate
- Erratic or inaccurate temperature gauge readings
Common Causes
- Faulty Engine Coolant Temperature (ECT) sensor
- Corroded, loose, or damaged electrical connections at the ECT sensor
- Damaged or frayed wiring in the ECT sensor circuit, causing an intermittent low voltage
- Faulty Engine Control Module (ECM) (less common)
- Intermittent open or short in the ECT circuit
Frequently reported on: Chrysler Town & Country (2001-2007), Dodge Caravan (2001-2007), Jeep Grand Cherokee (1999-2004), Dodge Ram 1500 (2002-2008), Chrysler Sebring (2001-2006)
Diagnostic Steps
- Safely park the vehicle on a level surface and ensure the engine is cool before beginning work.
- Locate the Engine Coolant Temperature (ECT) sensor. Its exact location varies by Chrysler model, but it's typically found near the thermostat housing or on an engine coolant passage.
- Carefully disconnect the electrical connector from the ECT sensor.
- Thoroughly inspect the connector and wiring for any signs of corrosion, bent pins, frays, or damage. Clean any corrosion with electrical contact cleaner and repair damaged wiring as needed.
- Position a drain pan beneath the sensor to catch any coolant that may spill.
- Use an appropriate wrench or socket to remove the old ECT sensor from its housing.
- Apply a small amount of thread sealant to the threads of the new ECT sensor, if not already pre-applied.
- Install the new ECT sensor, tightening it to the manufacturer's specified torque to prevent leaks.
- Reconnect the electrical connector to the new sensor, ensuring it clicks securely into place.
- Top off the engine coolant level as necessary, bleeding any air from the cooling system according to your vehicle's service manual.
- Clear the P1114 code from the Engine Control Module (ECM) using an OBD-II scanner.
- Start the engine, monitor the temperature gauge, and check for any leaks around the new sensor. Perform a test drive to confirm the code does not return and the engine operates normally.
👨🔧 When to Call a Professional
While replacing the ECT sensor is often a straightforward DIY task, if the code persists after sensor replacement and thorough wiring inspection, it suggests a more complex electrical issue or a faulty engine control module (ECM). In such cases, it's highly recommended to consult a professional mechanic with advanced diagnostic tools to pinpoint the root cause.
Commonly Asked Questions
Can I drive my Chrysler with a P1114 code?
While your vehicle might still run, it's not recommended to drive for extended periods with P1114. The incorrect temperature readings can lead to poor fuel economy, increased emissions, and potentially cause more significant engine problems over time.
How much does it cost to fix a P1114 code?
The cost to fix a P1114 code is typically low if it's just the ECT sensor. The part itself usually costs between $20 and $60. Labor costs would be minimal if you do it yourself, or around $50-$150 if a mechanic performs the repair.
Is the P1114 code related to the thermostat?
While both the ECT sensor and thermostat are part of the cooling system, P1114 specifically points to an issue with the ECT sensor's electrical circuit. A faulty thermostat might cause engine temperature issues, but it wouldn't directly trigger a P1114 code unless it indirectly damaged the sensor or its wiring.
What tools do I need to replace the ECT sensor on my Chrysler?
You'll typically need a basic set of wrenches or sockets (often 19mm or 3/4 inch), a drain pan for coolant, a funnel, and potentially pliers for hose clamps. An OBD-II scanner is also essential to clear the code and confirm the fix.
Could P1114 be caused by something other than the sensor?
Yes, while the sensor is the most common cause, P1114 can also be triggered by corroded or loose wiring and connectors in the sensor circuit, or in rare cases, a faulty Engine Control Module (ECM).