What Does P1110 Mean?
P1110 indicates a fault in the Intake Air Temperature (IAT) sensor circuit associated with a dynamic intake chamber or secondary intake runner system. This sensor monitors the temperature of air entering through the variable intake system, which is used for optimizing intake runner length and air charge density. A faulty signal may cause incorrect variable intake timing and reduced engine performance.
Common Causes
30%
Failed IAT sensor in the dynamic chamber or secondary intake runner
25%
Wiring damage or disconnection at the dynamic chamber IAT sensor
20%
Corroded connector pins due to moisture in the intake system
13%
ECM input circuit fault for the secondary IAT channel
12%
Short or open in the sensor ground circuit shared with other intake sensors
Diagnostic Steps
1
Step 1: Identify the location of the dynamic chamber IAT sensor. It is typically located in the variable intake manifold runner assembly, separate from the primary IAT sensor in the intake tract.
2
Step 2: Monitor the dynamic chamber IAT sensor reading via live data. Compare it to the primary IAT sensor — both should read similar temperatures when the engine is cold. A reading of -40°F or 300°F+ indicates an open or short.
3
Step 3: Disconnect the sensor and measure resistance across its pins. At room temperature (~70°F), expect approximately 2,000–3,000 ohms. Significantly out-of-range readings confirm sensor failure.
4
Step 4: Check for 5V reference and ground at the sensor connector with the sensor unplugged. Missing voltage or ground points to a wiring fault.
5
Step 5: Replace the dynamic chamber IAT sensor if resistance is out of specification. Clear codes and verify the reading tracks appropriately with temperature changes.
Estimated Repair Cost
$40 - $200
Parts + labor, varies by vehicle and location
P1110 indicates a fault in the Intake Air Temperature (IAT) sensor circuit associated with a dynamic intake chamber or secondary intake runner system. This sensor monitors the temperature of air entering through the variable intake system, which is used for optimizing intake runner length and air ch...
The most common cause of P1110 (Intake Air Temperature Sensor Signal (Dynamic Chamber) Circuit) is: Failed IAT sensor in the dynamic chamber or secondary intake runner
Typical repair costs for P1110 range from $40 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This fault may cause reduced engine performance and slightly higher emissions but does not present a direct safety hazard. The engine will default to conservative intake runner timing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1110 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Variable Intake System
Difficulty
Type
Manufacturer
Recommended Tools
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