P1018 Code - Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
Quick Answer
The P1018 diagnostic trouble code (DTC) refers to the Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage. Common causes include Faulty Reductant Control Module: A malfunctioning Reductant Control Module can cause issues with the voltage supply circuit for sensor communication, Wiring Issues: Damaged or corroded wiring in the voltage supply circuit can disrupt the communication between the sensor and the control module, Sensor Malfunction: A faulty sensor can also trigger the P1018 code, as it may not be receiving or sending the correct signals due to internal issues. 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
- P1018 indicates Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage.
- Common causes
- Common causes include Faulty Reductant Control Module: A malfunctioning Reductant Control Module can cause issues with the voltage supply circuit for sensor communication, Wiring Issues: Damaged or corroded wiring in the voltage supply circuit can disrupt the communication between the sensor and the control module, Sensor Malfunction: A faulty sensor can also trigger the P1018 code, as it may not be receiving or sending the correct signals due to internal issues.
- 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 P1018 Description
The P1018 diagnostic trouble code (DTC) refers to the Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage. This code indicates that there is a problem with the voltage supply circuit for the sensor communication in the Reductant Control Module. The Reductant Control Module is a crucial component of the vehicle's emissions system, responsible for monitoring and controlling the amount of reductant (such as Diesel Exhaust Fluid) that is injected into the exhaust stream to reduce harmful emissions.
Common Causes of P1018
- Faulty Reductant Control Module: A malfunctioning Reductant Control Module can cause issues with the voltage supply circuit for sensor communication.
- Wiring Issues: Damaged or corroded wiring in the voltage supply circuit can disrupt the communication between the sensor and the control module.
- Sensor Malfunction: A faulty sensor can also trigger the P1018 code, as it may not be receiving or sending the correct signals due to internal issues.
- Electrical Problems: Issues with the vehicle's electrical system, such as a blown fuse or a faulty relay, can affect the voltage supply circuit.
- Software/Programming Errors: Sometimes, software glitches or programming errors in the control module can cause communication problems with the sensor.
Symptoms of P1018
- Check Engine Light: The most common symptom associated with the P1018 code is the illumination of the check engine light on the dashboard.
- Decreased Fuel Efficiency: A malfunction in the Reductant Control Module can lead to decreased fuel efficiency as the engine may not be running optimally.
- Emissions Issues: If the reductant injection system is not functioning properly, it can result in increased emissions output from the vehicle.
- Rough Running Engine: A rough idle or hesitation during acceleration may be experienced due to the malfunctioning Reductant Control Module.
- Failed Emissions Test: If the vehicle has high emissions levels due to the P1018 code, it may fail emissions testing.
How to Fix P1018
- Diagnose the Issue: Use a diagnostic scan tool to retrieve the specific DTC and pinpoint the exact cause of the problem.
- Inspect Wiring and Connections: Check the wiring and connections in the voltage supply circuit for any signs of damage, corrosion, or loose connections.
- Test the Reductant Control Module: Test the Reductant Control Module to determine if it is functioning properly or needs to be replaced.
- Check the Sensor: Test the sensor to ensure it is sending and receiving the correct signals, and replace it if necessary.
- Clear the DTC: After making the necessary repairs, clear the DTC from the vehicle's computer using the diagnostic scan tool.
Cost to Fix P1018
The typical repair costs for addressing the P1018 DTC can vary depending on the specific cause of the issue and the labor rates at auto repair shops. On average, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $100 to $200. This estimate does not include any additional diagnostic time that may be required to pinpoint the exact cause of the problem. It's important to keep in mind that labor rates can vary based on location, vehicle make and model, and the expertise of the technician. It is recommended to obtain quotes from local auto repair shops to get a more accurate cost estimate for addressing the P1018 code.
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Code P1018 Information for Specific Makes
- P1018 Audi — Intake Manifold Runner Bank 2 Lower Limit Not Reached
- P1018 Buick — Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
- P1018 Cadillac — Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
- P1018 Chevrolet — Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
- P1018 Dodge — MAP Circuit HighReductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
- P1018 GMC — Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
- P1018 Volkswagen — Intake Manifold Runner Bank 2 Lower Limit Not Reached
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