P1110
ChryslerP1110 Chrysler: Intake Air Temperature (IAT) Sensor (D/C) Open/Short. This code indicates an electrical malfunction within the Intake Air Temperature sensor circuit, specifically an open circuit or a short circuit.
Medium SeverityThis code signifies an electrical issue with your vehicle's Intake Air Temperature (IAT) sensor, meaning the Powertrain Control Module (PCM) is not receiving accurate data about the temperature of the air entering the engine. This can lead to incorrect fuel mixture calculations, potentially affecting engine performance and fuel efficiency.
⚠️ Before You Begin (Safety First)
Always disconnect the battery before working on any electrical components in the engine bay. Ensure the engine is cool to the touch to prevent burns. Wear appropriate safety gloves and eye protection to protect yourself from hot surfaces, sharp edges, and electrical hazards.
Common Symptoms
- Illuminated Check Engine Light
- Decreased fuel economy
- Rough idle or stalling
- Hesitation during acceleration
- Difficulty starting the engine
- Failed emissions test
Common Causes
- Faulty or damaged Intake Air Temperature (IAT) sensor
- Corroded, loose, or damaged electrical connector for the IAT sensor
- Open circuit in the IAT sensor wiring (e.g., broken wire)
- Short circuit in the IAT sensor wiring (e.g., wire chafing and touching ground or another wire)
- Contaminated sensor element
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: Dodge Ram 1500 (2002-2008), Chrysler 300 (2005-2010), Dodge Grand Caravan (2001-2007), Jeep Wrangler (2007-2011), Dodge Charger (2006-2010)
Diagnostic Steps
- Locate the Intake Air Temperature (IAT) sensor. It is typically found in the air intake duct or manifold.
- Visually inspect the IAT sensor and its electrical connector for any signs of damage, corrosion, or loose connections.
- Disconnect the IAT sensor's electrical connector.
- Using a multimeter, test the resistance of the IAT sensor at various temperatures (refer to your vehicle's service manual for specific resistance values at different temperatures). A sudden jump or no reading indicates a fault.
- Check for continuity and resistance in the sensor's wiring harness back to the PCM using a multimeter, looking for opens or shorts.
- If the sensor tests faulty or the wiring is compromised, replace the IAT sensor or repair the damaged wiring as necessary.
- Clear the P1110 code using an OBD-II scanner and test drive the vehicle to ensure the repair is successful.
👨🔧 When to Call a Professional
If you have replaced the IAT sensor and thoroughly inspected the wiring and connectors without resolving the P1110 code, or if the code is accompanied by multiple other engine performance issues, it's a strong indication that it's time to consult a professional mechanic. This could point to a more complex wiring harness problem or, in rare cases, a PCM issue.
Commonly Asked Questions
What is an IAT sensor and what does it do?
The Intake Air Temperature (IAT) sensor measures the temperature of the air entering your engine. This data is crucial for the Powertrain Control Module (PCM) to calculate the correct fuel injection timing and amount for optimal combustion.
Can I drive my Chrysler with a P1110 code?
While your vehicle may still be drivable with a P1110 code, it's advisable to address it promptly. Prolonged driving with an inaccurate IAT reading can lead to poor fuel economy, increased emissions, and potentially other engine performance issues.
How can I test my IAT sensor at home?
You can test an IAT sensor using a multimeter. Disconnect the sensor and measure its resistance across its terminals. Compare the reading to the specifications in your vehicle's service manual for the current ambient air temperature. A faulty sensor will show an open circuit, a short, or a reading significantly outside the normal range.
What tools do I need to replace an IAT sensor?
Replacing an IAT sensor typically requires basic hand tools, such as a ratchet and appropriate socket or wrench, and possibly a flat-head screwdriver or trim removal tool. A multimeter is essential for testing the sensor and its circuit.
Is a P1110 code serious?
A P1110 code is considered moderately serious. While it may not immediately strand your vehicle, it affects engine efficiency and can cause drivability issues. Addressing it prevents potential long-term damage or more severe performance problems.