P1112 GMC Code - Intake Air Temperature Sensor Circuit Intermittent Low Voltage
Quick Answer
The Intake Air Temperature (IAT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). Common causes include Faulty Intake Air Temperature 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
- P1112 GMC indicates Intake Air Temperature Sensor Circuit Intermittent Low Voltage.
- Common causes
- Common causes include Faulty Intake Air Temperature 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.
Code P1112 GMC Description
When the intake air is cold, the sensor (thermistor) resistance is high, and the PCMs signal voltage is only pulled down a small amount through the sensor to ground. The PCM senses a high signal voltage (low temperature). When the intake air is warm, the sensor resistance is low, and the signal voltage is pulled down a greater amount. This causes the PCM to sense a low signal voltage (high temperature).
What are the Possible Causes of the DTC P1112 GMC?
- Faulty Intake Air Temperature Sensor
- Intake Air Temperature Sensor harness is open or shorted
- Intake Air Temperature Sensor circuit poor electrical connection
How to Fix the DTC P1112 GMC?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1112 GMC 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.
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Frequently Asked Questions about P1112 GMC Code
What does the OBDII code P1112 mean on a GMC vehicle?
Code P1112 indicates an "Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage," meaning the IAT sensor is sending an unstable or abnormally low voltage signal to the engine control module (ECM).
What are the symptoms of code P1112 on a GMC?
Common symptoms include poor engine performance, reduced fuel efficiency, hesitation during acceleration, rough idling, and possibly the illumination of the check engine light.
What causes the P1112 code to appear?
Potential causes include a faulty IAT sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning ECM.
Can a dirty air filter cause the P1112 code?
While a dirty air filter can affect airflow, it is unlikely to directly cause the P1112 code. However, it’s always good to check and replace the air filter as part of routine maintenance.
How do you diagnose the P1112 code?
Diagnosis typically involves using an OBDII scanner, inspecting the IAT sensor and its wiring for damage, testing the sensor's voltage signal with a multimeter, and checking for loose or corroded connections.
Can I drive with the P1112 code active?
Driving with this code is possible but not recommended, as it may lead to poor engine performance and reduced fuel efficiency. Prolonged driving without addressing the issue could cause further damage.
How do you fix code P1112 on a GMC?
Repairs may include replacing the faulty IAT sensor, repairing or replacing damaged wiring, cleaning electrical connections, or, in rare cases, replacing the ECM if it’s determined to be the root cause.
How much does it cost to fix the P1112 code?
Repair costs can vary depending on the issue. Replacing an IAT sensor typically costs $50–$150, while wiring repairs or ECM replacement may be more expensive.
Can a bad mass airflow (MAF) sensor trigger the P1112 code?
A malfunctioning MAF sensor generally does not trigger P1112 directly, but related issues with airflow readings could indirectly affect the IAT sensor's performance.
How can I prevent the P1112 code from recurring?
Regularly inspect and maintain the IAT sensor, clean electrical connections, check for wiring damage, and replace the air filter as part of routine vehicle maintenance.
Discuss the causes and fixes for P1112 GMC OBDII Code
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