P1111 2018 Chevrolet Silverado Code - Intake Air Temperature Sensor Circuit Intermittent High Voltage
Quick Answer
The P1111 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the Intake Air Temperature (IAT) Sensor Circuit showing intermittent high voltage. Common causes include Faulty or damaged IAT sensor, Wiring or connector issues in the IAT sensor circuit, ECM software or hardware problems. 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
- P1111 2018 Chevrolet Silverado indicates Intake Air Temperature Sensor Circuit Intermittent High Voltage.
- Common causes
- Common causes include Faulty or damaged IAT sensor, Wiring or connector issues in the IAT sensor circuit, ECM software or hardware problems.
- 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 P1111 2018 Chevrolet Silverado Description
The P1111 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the Intake Air Temperature (IAT) Sensor Circuit showing intermittent high voltage. The IAT sensor is a crucial component of the vehicle's engine management system, as it measures the temperature of the air entering the engine. This information is used by the Engine Control Module (ECM) to adjust the air-fuel mixture for optimal combustion and performance.
Common Causes of P1111 2018 Chevrolet Silverado
- Faulty or damaged IAT sensor
- Wiring or connector issues in the IAT sensor circuit
- ECM software or hardware problems
- Intake air leaks near the sensor
- Extreme temperature fluctuations affecting sensor readings
Symptoms of P1111 2018 Chevrolet Silverado
- Check Engine Light illuminated on the dashboard
- Rough idling or stalling
- Decreased fuel efficiency
- Engine misfires
- Reduced engine performance
How to Fix P1111 2018 Chevrolet Silverado
- Begin by diagnosing the issue using a scan tool to confirm the P1111 code and check the IAT sensor's voltage readings.
- Inspect the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
- Test the IAT sensor's resistance and compare it to manufacturer specifications. Replace the sensor if it is out of range.
- Clear the DTC and reset the ECM to see if the code returns after repairs.
- Perform a test drive to ensure the issue is resolved and the vehicle's performance is back to normal.
Cost to Fix P1111 2018 Chevrolet Silverado
The cost of repairing a P1111 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of replacing an IAT sensor ranges from $50 to $150, while labor costs can range from $80 to $150 per hour. Additional costs may include diagnostic time, wiring repairs, or ECM reprogramming if necessary. Overall, the total repair cost for this issue could range from $150 to $400, but it is advisable to obtain a detailed quote from a qualified mechanic based on the specific diagnosis and repair requirements.
Tech Notes for P1111 2018 Chevrolet Silverado
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