AutoCodes – Chevrolet – P1127 2018 Chevrolet Silverado

P1127 2018 Chevrolet Silverado Code - Intake Air Temperature Sensor Performance High Temperature

Quick Answer

The Intake Air Temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the Engine Control Module (ECM) supplied 5 V signal circuit. Common causes include Faulty Intake Air Temperature (IAT) sensor (Integrated within the Mass Air Flow / Multifunction Intake Air Sensor), Intake Air Temperature sensor harness is open or shorted, Intake Air Temperature sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1127 2018 Chevrolet Silverado indicates Intake Air Temperature Sensor Performance High Temperature.
Common causes: Common causes include Faulty Intake Air Temperature (IAT) sensor (Integrated within the Mass Air Flow / Multifunction Intake Air Sensor), Intake Air Temperature sensor harness is open or shorted, Intake Air Temperature sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 217

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1127 2018 Chevrolet Silverado Description

The Intake Air Temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the Engine Control Module (ECM) supplied 5 V signal circuit. The signal varies with inlet air temperature in the sensor bore and is displayed by the scan tool as °C (°F). The IAT sensor 2 and the humidity sensor share the same circuit. The IAT sensor 2 signal is displayed by the scan tool as Hertz (Hz) and °C (°F). The Diagnostic Trouble Code (DTC) will be set when the ECM detects a fault is detected on the IAT signal or control circuits.

OBDII Code P1127 2018 Chevrolet Silverado - Intake Air Temperature Sensor Performance High Temperature - AutoCodes.com — P1127 2018 Chevrolet Silverado Code - Intake Air Temperature Sensor Performance High Temperature

What does this mean?

What are the Possible Causes of the DTC P1127 2018 Chevrolet Silverado?

Faulty Intake Air Temperature (IAT) sensor (Integrated within the Mass Air Flow / Multifunction Intake Air Sensor)
Intake Air Temperature sensor harness is open or shorted
Intake Air Temperature sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1127 2018 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The Intake Air Temperature (IAT) sensor 1, IAT sensor 2, Humidity sensor, MAF sensor, and BARO pressure sensor are integrated within the Mass Air Flow / Multifunction Intake Air Sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1127 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1127 2018 Chevrolet Silverado code?

Need more information on how to fix the P1127 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1127 2018 Chevrolet Silverado Code

What does the OBDII code P1127 mean on a 2018 Chevrolet Silverado?

P1127 indicates that the intake air temperature (IAT) sensor is reporting a performance issue, specifically detecting an abnormally high temperature reading.

What are the common symptoms of code P1127 on a 2018 Chevrolet Silverado?

Symptoms may include poor engine performance, reduced fuel efficiency, hesitation during acceleration, and possible illumination of the check engine light.

What causes the P1127 code on a 2018 Chevrolet Silverado?

Common causes include a faulty IAT sensor, damaged wiring or connectors, a dirty or clogged air intake system, or an actual overheating intake air condition.

Can a dirty air filter trigger the P1127 code?

Yes, a clogged or dirty air filter can restrict airflow, potentially causing abnormally high intake air temperatures and triggering this code.

How do I diagnose the P1127 code on my 2018 Chevrolet Silverado?

Start by inspecting the IAT sensor and its wiring for damage or corrosion, checking for air intake obstructions, and using a scan tool to monitor live data from the sensor.

Is it safe to drive my 2018 Chevrolet Silverado with the P1127 code active?

Driving with this code may result in reduced performance and fuel efficiency. While it may not immediately damage the engine, prolonged driving without repairs could cause further issues.

Can a software update fix the P1127 code on a 2018 Chevrolet Silverado?

In rare cases, a software update from the manufacturer could address sensor calibration issues, but physical causes like faulty sensors or wiring are more common.

How much does it cost to fix the P1127 code on a 2018 Chevrolet Silverado?

Repair costs can vary, ranging from $50 for a new sensor to $200 or more if professional diagnostics and repairs are required.

Can I clear the P1127 code without fixing the issue?

Clearing the code with a scan tool will temporarily remove it, but if the underlying issue isnâ€™t resolved, the code will likely return.

What tools do I need to fix the P1127 code on a 2018 Chevrolet Silverado?

You may need a scan tool for diagnostics, a multimeter to test the IAT sensor and wiring, and basic tools to access and replace the sensor if necessary.