P0110 — Intake Air Temperature Circuit Malfunction Bank 1

OBD2 code P0110 flags a problem with the throttle and intake air metering (intake air temperature circuit malfunction bank 1). Short, gentle driving to a shop is usually possible. Common culprits: dirty throttle body or stuck throttle plate, wiring or connector faults in the throttle circuit, contaminated or failed MAF/MAP sensor.

powertrain (engine/transmission)

Is it safe to drive?

Drive cautiously and schedule service P0110 does not normally require an immediate stop, but the vehicle may run poorly, consume extra fuel, or restart poorly when cold. Avoid extended driving if the engine stalls, runs extremely rough, or the scanner shows an unrealistic intake air temperature.

Typical symptoms

The check engine light illuminates and the control module stores P0110.
The engine may idle roughly, hesitate, or stumble during acceleration.
Cold starting can be noticeably difficult, especially if P0110 causes an incorrect cold-air reading.
Fuel trims may become more positive than expected because the control module believes the incoming air is colder than it really is.
The intake air temperature value shown on a scan tool may remain implausibly high, low, or frozen while the engine warms.
A weak or inconsistent electrical connection can make P0110 appear intermittently and return after being cleared.

Common causes

The bank 1 intake air temperature sensor has failed or its resistance has moved outside the expected range.
An open or short circuit exists in the intake air temperature sensor signal, reference, or ground wiring.
Corrosion, water intrusion, or a loose terminal has created an intermittent connection at the sensor connector.
Chafing or damage in the wiring harness near the intake air temperature sensor has interrupted the circuit.
A disconnected, incorrectly installed, or contaminated intake air temperature sensor is producing an invalid signal.
A powertrain control module input or ground fault is possible, although this is less common than a sensor or wiring failure.

How to diagnose with an OBD scanner

Read P0110 data with an OBD scanner Connect an ELM327 adapter or compatible scanner such as AIScanAuto, read stored codes and freeze-frame data, and confirm that P0110 is currently active. Also note any misfire, lean, or rich fuel-trim codes stored with it.
Compare live intake air temperature data With the engine cold, compare the scanner's intake air temperature reading with the actual temperature of the incoming air. The value should change smoothly toward ambient temperature and follow engine heat as the vehicle warms; an implausible P0110-related value points to the sensor or its circuit.
Inspect the sensor and connector Locate the intake air temperature sensor in the intake duct or intake manifold, then examine its connector and harness. Look for water, corrosion, bent terminals, cracked insulation, loose plugs, or damage from nearby moving components.
Perform a circuit and resistance test Disconnect the sensor and test its resistance at a known temperature, then check the control module reference voltage, sensor signal, ground continuity, and shorts. Compare measurements with service information for the exact vehicle because pin assignments and sensor specifications vary.
Repair and verify P0110 Repair the damaged wiring or connector, replace the intake air temperature sensor if it is out of specification, and verify that the air-intake assembly is sealed. Clear P0110 with the scanner, drive through a complete warm-up, and confirm that live sensor data and fuel trims behave normally.

Approximate repair cost

A typical independent-shop estimate for diagnosing and repairing P0110 is USD 125-450. This range includes the diagnostic labor and common sensor or wiring repairs; harness work or control module repairs can cost more. Figures are estimates and vary by region.

Common questions

What does P0110 specifically identify?

P0110 identifies a malfunction in the bank 1 intake air temperature sensor or its electrical circuit, including abnormal sensor resistance, an open circuit, or a short circuit.

Can I drive with P0110 stored?

You can usually drive briefly while arranging repair, but rough idle, stalling, hesitation, poor cold starting, or elevated fuel consumption should be investigated promptly to prevent further damage.

Does P0110 mean the engine thermostat is defective?

No. P0110 concerns the intake air temperature sensor circuit, not the coolant thermostat. The two sensors measure different temperatures and should not be replaced based on this code alone.

Why does P0110 return after the codes are cleared?

Clearing P0110 does not repair an open wire, bad connector, failed sensor, or other underlying fault. The code will return whenever the control module again detects the invalid circuit behavior.

When your check engine light comes on and a scan tool shows P0110, the engine control unit has detected a fault in the intake air temperature circuit on bank 1 of your engine. P0110 specifically relates to how the ECU monitors and reacts to the temperature of air entering the engine. This reading plays a direct role in how much fuel the injectors deliver and how the throttle responds to your inputs. When the signal from the intake air temperature sensor falls outside the expected voltage range for a sustained period, the ECU stores P0110 and illuminates the warning light.

The intake air temperature sensor works alongside the mass airflow or manifold absolute pressure sensor to give the engine control module a complete picture of incoming air. The ECU needs this data to calculate air density, which changes with temperature. Cold air is denser, so the engine needs more fuel. If the sensor sends no signal, an erratic signal, or a reading that clearly falls outside the normal range, the ECU cannot make accurate fuel and throttle adjustments. When this condition persists across enough drive cycles, P0110 gets set and the vehicle may enter a protective limp-home mode designed to prevent engine damage.

Bank 1 refers to the engine bank containing cylinder number 1. On V-type engines, this is typically the left or right side depending on the manufacturer. Locating cylinder 1 before beginning diagnosis is important because the wiring and sensor for the wrong bank will lead you down the wrong path. The freeze frame data stored alongside P0110 captures RPM, engine load, vehicle speed, and sensor temperatures at the exact moment the fault occurred, giving you a reliable starting point for tracking down the root cause.

Symptoms of P0110

Check Engine Light illuminated on the dashboard
Sluggish or unresponsive throttle pedal
Rough idle or higher-than-normal idle speed
Engine stalling when decelerating or coming to a stop
Reduced power mode that limits speed and acceleration
Possible intermittent hesitation during acceleration

Common Causes of P0110

Carbon buildup or debris blocking the throttle body and preventing smooth plate movement
Faulty or contaminated mass air flow sensor affecting air metering accuracy
Damaged wiring harness or loose connectors in the intake air temperature circuit
Failed intake air temperature sensor with an out-of-range electrical output
Malfunctioning throttle position sensor sending incorrect data to the ECU
Defective electronic throttle motor unable to respond to pedal commands

How to Diagnose P0110

Plug in an OBD2 scan tool, confirm P0110 is stored, and record the freeze frame data before clearing anything. This snapshot tells you exactly what the engine was doing when the fault was detected.
Check for any additional trouble codes that appeared alongside P0110. Related sensor codes often point to the real problem, whether it is the MAF sensor, throttle position sensor, or something else entirely.
Search for technical service bulletins for your specific make, model, and model year using the vehicle identification number on the manufacturer website or nhtsa.gov. Many P0xxx codes have documented factory fixes or calibration updates that resolve the issue without parts replacement.
Perform a thorough visual inspection of the wiring and connectors related to the throttle and intake air metering system. Look for damaged insulation, corrosion, broken pins, or connectors that are not fully seated.
With the key on and engine off, monitor live data for throttle position and air flow sensor readings while slowly pressing and releasing the accelerator pedal. Values should change smoothly and return to baseline without stuttering or dropping out.
After addressing any found issues, clear the code and complete a drive cycle that recreates the conditions recorded in the freeze frame data. Watch to confirm P0110 does not return.

Repair Options and Costs for P0110

Before spending money on parts, work through the cheapest and most common causes first.

Throttle body cleaning to remove carbon deposits: $80–$200
Replacement of the mass air flow or manifold absolute pressure sensor: $150–$400
Replacement of the complete throttle body assembly: $250–$700

Prices reflect parts and labor at an independent repair shop in USD. The exact cost depends on which component is ultimately responsible for triggering P0110. Cleaning the throttle body is almost always worth trying first since carbon buildup is a frequent culprit, and the part often does not need replacement. An accurate diagnosis based on live data and thorough inspection will tell you whether the problem lies in wiring, the sensor itself, or the throttle body unit before you commit to any repair.

Can You Drive with P0110?

Use caution. While some vehicles continue to operate normally with P0110 stored, many throttle-related faults cause the ECU to activate limp-home mode, which significantly reduces engine power to protect drivetrain components. This reduced power is enough to get you to a repair facility on local roads, but it is not suitable for highway driving or long distances. If the engine stalls completely or the accelerator pedal becomes unresponsive, stop driving immediately and have the vehicle towed. Do not ignore the warning light or continue operating the vehicle if you notice hesitation, stalling, or loss of throttle control.