Faulty intake air temperature sensor (internal open or short circuit, or drifted readings); Damaged, chafed or corroded wiring to the sensor (open circuit, short to ground or short to voltage); Loose, corroded or contaminated sensor connector or terminals; Sensor integrated into the mass airflow sensor and failed along with it (depends on the vehicle); Fault in the shared sensor ground or 5 volt reference supply; Fault inside the engine control unit.

P0110

Intake Air Temperature Sensor 1 Circuit Bank 1.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
1: AreaFuel and air metering
10: FaultThe specific fault in that area

What it means

P0110 is the generic code for a fault in the intake air temperature (IAT) sensor 1 circuit on bank 1. The engine control unit has seen a signal that is outside the expected range, is not plausible, or is missing altogether. This usually points to a wiring, connector or sensor problem, and the ECU will substitute a default temperature value in the meantime.

Symptoms

Malfunction indicator lamp on
Hard or prolonged cranking when starting, especially from cold
Rough idle or hesitation under load
Poor fuel economy
Slightly reduced performance or richer or leaner running than normal
Cooling fan running more often than usual on some vehicles

Possible causes

Faulty intake air temperature sensor (internal open or short circuit, or drifted readings)likely
Damaged, chafed or corroded wiring to the sensor (open circuit, short to ground or short to voltage)likely
Loose, corroded or contaminated sensor connector or terminalslikely
Sensor integrated into the mass airflow sensor and failed along with it (depends on the vehicle)possible
Fault in the shared sensor ground or 5 volt reference supplypossible
Fault inside the engine control unitrare

How to diagnose

Read all stored and pending codes and the freeze frame data to see the conditions when the fault was set, and note any related codes such as airflow or other sensor supply faults
With the engine cold, compare the live IAT reading with the coolant temperature and the actual ambient temperature; they should be close to each other
Look for an implausible live reading such as a fixed extreme high or low value, which suggests an open or shorted circuit
Inspect the sensor, connector and wiring for damage, chafing, water ingress, corrosion and bent or pushed-out terminals
Wiggle the harness and connector with the engine running while watching the live IAT value for dropouts or jumps
Unplug the sensor and check its resistance against the manufacturer's temperature specification, and check the reading changes as the sensor warms or cools
With the sensor unplugged, check the reference voltage and ground at the harness connector and test the wiring for continuity and shorts, following the wiring diagram for the model
If the sensor is part of the airflow sensor assembly, check the specification for that vehicle before condemning either part

How to fix

Replace the intake air temperature sensor, or the combined airflow sensor assembly where the IAT sensor is not available separately
Repair or replace damaged wiring, correcting any open circuit or short
Clean, repair or replace the connector and terminals, and secure them properly
Restore a faulty ground or reference supply once the cause has been located
Clear the code after repair and road test to confirm it does not return; only consider the control unit if all wiring and sensor checks pass and the manufacturer's procedure supports it

Can I keep driving?

Low severity

The car can usually be driven, as the ECU uses a default value, but you should book it in soon. Poor starting, rough running or higher fuel use may occur until it is repaired.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.