P140D Code - Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage
Quick Answer
The P140D diagnostic trouble code (DTC) refers to an issue with the Exhaust Gas Recirculation (EGR) motor control circuit 2 having low voltage. Common causes include Faulty EGR Valve Motor: A malfunctioning EGR valve motor can lead to low voltage in the EGR motor control circuit 2, Wiring Issues: Corroded, damaged, or loose wiring connections can disrupt the flow of voltage in the circuit, triggering the P140D code, Faulty Control Module: An issue with the control module responsible for regulating the EGR valve motor operation can cause low voltage in the circuit. 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
- P140D indicates Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage.
- Common causes
- Common causes include Faulty EGR Valve Motor: A malfunctioning EGR valve motor can lead to low voltage in the EGR motor control circuit 2, Wiring Issues: Corroded, damaged, or loose wiring connections can disrupt the flow of voltage in the circuit, triggering the P140D code, Faulty Control Module: An issue with the control module responsible for regulating the EGR valve motor operation can cause low voltage in the circuit.
- 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 P140D Description
The P140D diagnostic trouble code (DTC) refers to an issue with the Exhaust Gas Recirculation (EGR) motor control circuit 2 having low voltage. The EGR system is crucial for reducing emissions and improving fuel efficiency by recirculating a portion of the engine's exhaust gases back into the intake system. This helps lower the combustion temperature, reducing harmful nitrogen oxide emissions produced during combustion.
Common Causes of P140D
- Faulty EGR Valve Motor: A malfunctioning EGR valve motor can lead to low voltage in the EGR motor control circuit 2.
- Wiring Issues: Corroded, damaged, or loose wiring connections can disrupt the flow of voltage in the circuit, triggering the P140D code.
- Faulty Control Module: An issue with the control module responsible for regulating the EGR valve motor operation can cause low voltage in the circuit.
- Vacuum Leaks: Any vacuum leaks in the EGR system can affect the operation of the EGR valve motor, leading to low voltage.
Symptoms of P140D
- Check Engine Light: The most common symptom associated with the P140D code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Engine Performance: The vehicle may experience a decrease in power and acceleration due to improper EGR valve operation.
- Rough Idle: An irregular or rough idle may be noticed, as the engine struggles to maintain a consistent speed.
- Increased Emissions: The vehicle may produce higher emissions than usual, which can be detected during emissions testing.
- Fuel Efficiency Issues: A decrease in fuel efficiency may be observed as the engine struggles to operate efficiently with a faulty EGR system.
How to Fix P140D
- Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the EGR system components to identify the root cause of the problem.
- Inspect Wiring: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
- Test EGR Valve Motor: Test the EGR valve motor to ensure it is functioning properly. Replace the motor if it is found to be faulty.
- Check Control Module: Inspect the EGR control module for any signs of damage or malfunction. Replace the control module if necessary.
- Clear DTC and Test Drive: After completing the repairs, clear the DTC from the vehicle's memory using a scan tool. Take the vehicle for a test drive to ensure the issue has been resolved.
Cost to Fix P140D
The cost of repairing a P140D code can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing an EGR valve motor can range from $200 to $500, while replacing a control module can cost between $150 and $300. The total repair cost, including parts and labor, may range from $300 to $800. Keep in mind that diagnostic time and labor rates can affect the final cost, so it's advisable to get quotes from local auto repair shops for a more accurate estimate.
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Code P140D Information for Specific Makes
- P140D Chevrolet — Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage
- P140D Ford — Exhaust Gas Recirculation Control Circuit 'B' Range/Performance
- P140D GMC — Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage
- P140D Lincoln — Exhaust Gas Recirculation Control Circuit 'B' Range/Performance
Frequently Asked Questions about P140D Code
1. What does the OBDII code P140D mean?
P140D indicates a low voltage issue in the Exhaust Gas Recirculation (EGR) Motor Control Circuit 2, which affects the EGR system's ability to regulate emissions.
2. What are the common symptoms of code P140D?
Symptoms may include a rough idle, reduced engine performance, increased emissions, poor fuel efficiency, and the illumination of the Check Engine Light.
3. What causes the P140D code to appear?
Common causes include a faulty EGR motor, damaged or corroded wiring/connectors in the EGR circuit, a failing EGR valve, or a malfunctioning powertrain control module (PCM).
4. Can I drive my car with the P140D code?
Driving with this code is not recommended as it could lead to increased emissions, poor engine performance, and potential damage to other components over time.
5. How can I diagnose the P140D code?
Use an OBDII scanner to confirm the code, visually inspect the EGR motor wiring and connectors, and test the EGR motor's voltage and functionality using a multimeter.
6. What repairs can resolve the P140D code?
Repairs may include replacing the EGR motor, repairing or replacing damaged wiring, cleaning or replacing the EGR valve, or reprogramming or replacing the PCM if necessary.
7. What tools are needed to fix the P140D code?
You'll typically need an OBDII scanner, a digital multimeter, basic hand tools, and possibly EGR system cleaning tools or replacement parts.
8. Is cleaning the EGR valve enough to fix the P140D code?
In some cases, cleaning the EGR valve can resolve the issue if carbon buildup is causing the problem, but if the motor or circuit has failed, cleaning alone will not fix it.
9. How much does it cost to fix the P140D code?
Repair costs vary depending on the issue. Replacing an EGR motor can cost $100-$400, while addressing wiring issues or PCM replacement may add additional costs.
10. Can low battery voltage cause the P140D code?
Yes, low battery voltage or a weak alternator can contribute to this code by affecting the EGR motor's electrical performance. Ensure the electrical system is functioning properly.
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