P1112 ACURA – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

P1112 ACURA Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit

How to Fix P1112 ACURA Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P1112 ACURA Meaning

The intake air temperature (IAT) sensor is integrated into the mass air flow sensor or in some vehicles mounted on the air filter housing. The sensor detects the intake air temperature and sends a signal to the engine control module (ECM). The temperature sensing unit uses a thermistor that is sensitive to temperature changes. The electrical resistance of the thermistor decreases in response to increasing temperature. The intake air temperature signal is used as input for various vehicle systems.

P1112 AUDI – Bank 1 HO2S Control System Too Rich

P1112 AUDI Possible Causes

Faulty HO2 sensor, bank 1
HO2 sensor harness for bank 1 is open or shorted
Poor electrical connection in HO2 sensor circuit, bank 1

How to Fix P1112 AUDI Code?

Possible Symptoms

Engine light on (or service engine soon warning light)

P1112 AUDI Meaning

HO2S Control Bank 1 Too Rich system is the generic description for Audi P1112 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Audi P1112 OBDII code.

P1112 BMW – Engine Coolant Temperature Radiator Outlet Sensor High Input

BMW Diagnostic Code P1112: Engine Coolant Temperature Radiator Outlet Sensor Problem

Possible Causes of BMW P1112 Code

The P1112 code can be triggered by one of the following causes:

Faulty engine coolant temperature radiator outlet sensor
Open or short circuit in the radiator outlet sensor wiring harness
Poor electrical connection in the sensor circuit

Possible Symptoms

Illuminated engine light (Check Engine or engine warning light)

Meaning of BMW P1112 Code

The P1112 code indicates a high input from the engine coolant temperature radiator outlet sensor. This description is generic, but the manufacturer may have a specific interpretation depending on the vehicle model and year.

How to Fix BMW P1112 Code?

Check the possible causes listed above.
Visually inspect the associated wiring harness and connectors.
Look for damaged components and examine connector pins for any breaks, bends, push-outs, or corrosion.
Replace or repair faulty components as necessary.

Conclusion

The P1112 code is related to a problem with the coolant temperature radiator outlet sensor. A thorough inspection of the wiring harness and connections can help quickly identify and resolve the issue.

P1112 BUICK – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

Code P1112 Buick: Causes, Symptoms, and Solutions

The code P1112 is an OBD-II code specific to Buick vehicles, related to the Intake Air Temperature (IAT) sensor circuit. This sensor measures the temperature of the air entering the engine, a crucial data point for optimizing the air-fuel mixture.

Meaning of Code P1112

The IAT sensor is a thermistor: its resistance varies with the air temperature.
The PCM sends a 5 V reference voltage to the sensor.
Cold air → High resistance → High signal voltage (e.g., 4.5 V).
Hot air → Low resistance → Low signal voltage (e.g., 0.5 V).
The code P1112 is triggered when the PCM detects an abnormal value (voltage out of range) in the IAT sensor circuit.

Possible Causes

Faulty IAT sensor (damaged thermistor).
Wiring problems:
- Open or short circuit (signal or ground wires).
- Oxidized, loose, or corroded connector.
PCM failure (rare).

Common Symptoms

Check Engine Light illuminated (MIL).
Unstable idle or difficulty starting.
Engine overheating or excessive fuel consumption.
Reduced performance (gear shifting issues, loss of power).

Diagnostic and Repair Procedures

Step 1: Visual Inspection

Locate the IAT sensor (usually in the intake duct or air filter housing).
Check the connector and wiring harness for:
- Bent, broken, or corroded pins.
- Damaged or exposed wires.

Step 2: IAT Sensor Test

Disconnect the sensor and measure its resistance with a multimeter:
- Ambient air (~20°C): Resistance ≈ 2,000–3,000 Ω.
- Hot air (using a hairdryer): Resistance should decrease.
If the resistance is out of range → Replace the sensor.

Step 3: Electrical Circuit Check

Turn the ignition on (without starting the engine).
Measure the reference voltage at the sensor connector:
- Expected: ≈5 V.
- If absent: Check the circuit between the PCM and the sensor.
Check the sensor ground with a multimeter (continuity between the sensor ground and chassis ground).

Step 4: PCM Test

If the wiring and sensor are functional, suspect a faulty PCM.
Confirm with a scan tool by comparing IAT data with an external thermometer.

Solutions

Replace the IAT sensor if faulty (average cost: €30–€80).
Repair the wiring or replace the damaged connector.
Reset the code after repair using a diagnostic tool.

Practical Tips

Cleaning: A dirty sensor can distort readings → Use an electronic cleaner.
Compatibility: Choose a sensor compatible with your Buick model.
Post-repair verification: Test drive the vehicle to confirm the absence of symptoms.

For advanced diagnostics, consult a certified mechanic or a repair manual specific to your Buick.

P1112 CADILLAC – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

P1112 CADILLAC Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit

How to Fix P1112 CADILLAC Code?

Possible Symptoms

Illuminated check engine light (or service engine soon warning light)

P1112 CADILLAC Meaning

The intake air temperature (IAT) sensor contains a semiconductor device that changes resistance based on temperature (a thermistor). The IAT sensor is mounted in the air intake passage of the engine air intake system. The IAT sensor has a signal circuit and a ground circuit. The PCM applies a voltage (approximately 5.0 volts) to the sensor signal circuit. The PCM monitors changes in this voltage caused by changes in the sensor’s resistance to determine the intake air temperature.

When the intake air is cold, the sensor resistance (thermistor) is high and the PCM signal voltage is only slightly lowered across the sensor to ground. The PCM detects a high signal voltage (low temperature). When the intake air is hot, the sensor resistance is low and the signal voltage is lowered further. This causes the PCM to detect a low signal voltage (high temperature).

P1112 CHEVROLET – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

P1112 CHEVROLET Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit

How to Fix P1112 CHEVROLET Code?

Possible Symptoms

Engine light on (or service engine soon warning light)

P1112 CHEVROLET Meaning

P1112 CHRYSLER – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

P1112 CHRYSLER Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit

How to Fix P1112 CHRYSLER Code?

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P1112 CHRYSLER Meaning

P1112 DODGE – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

DODGE Code P1112: Causes, Symptoms, and Repairs

1. Meaning of DODGE Code P1112

Code P1112 is a diagnostic trouble code (DTC) related to the Intake Air Temperature (IAT) sensor.

The IAT sensor can be:

Integrated into the Mass Air Flow (MAF) sensor.
Mounted on the air filter housing, depending on the vehicle model.

IAT Sensor Operation

It detects the intake air temperature and sends a signal to the Engine Control Module (ECM).
It contains a thermistor that is sensitive to temperature changes.
The higher the temperature, the lower the resistance.
The ECM uses this data to adjust fuel injection, ignition timing, and other parameters.

If the sensor signal is abnormal or intermittent, the code P1112 is stored and the check engine light may illuminate.

2. Possible Symptoms of Code P1112

Illuminated check engine light
Engine malfunctions (rough idle, poor performance)
Excessive fuel consumption
Hard starting in cold weather

3. Possible Causes of Code P1112

Code P1112 can be caused by:

Faulty Intake Air Temperature (IAT) sensor
Open or shorted IAT sensor harness
Poor electrical connection in the IAT circuit

4. How to Repair DODGE Code P1112?

1. Check the wiring and connectors condition

Visually inspect the IAT sensor wiring harness.
Look for broken, corroded, or shorted wires.
Check the connector pins (broken, bent, or corroded).

2. Test the IAT sensor with a multimeter

Disconnect the IAT sensor and measure the resistance.
Compare the obtained value to the manufacturer’s specifications.
If the resistance is out of tolerance, replace the sensor.

3. Check the IAT sensor signal with an OBD-II scanner

Read the real-time values to see if the displayed air temperature is consistent.
If the value is stuck or inconsistent, suspect a faulty sensor.

4. Clear the Code and Test the Vehicle

Clear the trouble code with an OBD-II scanner.
Perform a road test to see if the code reappears.

Conclusion

DODGE code P1112 is usually caused by a faulty IAT sensor or a wiring problem. An accurate diagnosis by following the steps above will resolve the issue and improve engine operation and fuel consumption.

P1112 FORD – Intermittent Intake Air Temperature Sensor Condition

P1112 FORD Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit
Damaged powertrain control module (PCM)

How to Fix P1112 FORD Code?

What Does It Mean?

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with mass air flow sensor cleaner. Reset the code and drive the vehicle. If the code returns, the mass air flow sensor may need to be replaced. Monitor the IAT on a scan tool. Look for sudden changes in the reading when the harness is shaken or the sensor is tapped.

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P1112 FORD Meaning

The IAT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as temperature increases and resistance increases as temperature decreases. The variable resistance affects the voltage drop across the sensor terminals and provides electrical signals to the powertrain control module (PCM) corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that the change in resistance of the passive sensor causes a change in the total current flow. The voltage that drops across a fixed resistor in series with the sensor resistance determines the voltage signal to the PCM. This voltage signal equals the reference voltage minus the voltage drop across the fixed resistor.

The IAT sensor provides air temperature information to the PCM. The PCM uses air temperature information as a correction factor in calculating fuel, spark, and air flow.

The IAT sensor provides faster response time to temperature change than the ECT or CHT sensor.

Currently, there are 2 types of IAT sensors used, a standalone, non-integrated type and an integrated type. Both types function the same way, but the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a standalone sensor.

P1112 GMC – Intermittent Low Voltage in Intake Air Temperature Sensor Circuit

P1112 GMC Possible Causes

Faulty intake air temperature sensor
Intake air temperature sensor harness is open or shorted
Poor electrical connection in the intake air temperature sensor circuit

How to Fix P1112 GMC Code?

Possible Symptoms

Illuminated engine light (or engine service warning light soon)

P1112 GMC Meaning

The Intake Air Temperature (IAT) sensor contains a semiconductor device that changes resistance based on temperature (a thermistor). The IAT sensor is mounted in the air intake passage of the engine air intake system. The IAT sensor has a signal circuit and a ground circuit. The PCM applies a voltage (approximately 5.0 volts) to the sensor signal circuit. The PCM monitors changes in this voltage caused by changes in the sensor’s resistance to determine the intake air temperature.