P1933 Code - Fuel Additive Pump Control Circuit Low
Quick Answer
The diagnostic trouble code P1933 indicates a problem with the fuel additive pump control circuit being detected as too low. Common causes include Faulty fuel additive pump, Damaged control circuit, Wiring 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
- P1933 indicates Fuel Additive Pump Control Circuit Low.
- Common causes
- Common causes include Faulty fuel additive pump, Damaged control circuit, Wiring 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 P1933 Description
The diagnostic trouble code P1933 indicates a problem with the fuel additive pump control circuit being detected as too low. The fuel additive pump is responsible for injecting fuel additives into the fuel system to improve fuel efficiency, reduce emissions, and maintain engine performance. When the control circuit for the fuel additive pump is operating at a low voltage, it can lead to a variety of issues with the vehicle's fuel system.
Common Causes of P1933
- Faulty fuel additive pump
- Damaged control circuit
- Wiring issues
- Corrosion or loose connections
- Faulty control module
Symptoms of P1933
- Decreased fuel efficiency
- Engine running rough or misfiring
- Check engine light illuminated
- Failed emissions test
- Vehicle stalling or hesitating during acceleration
How to Fix P1933
- Begin by conducting a visual inspection of the fuel additive pump, control circuit, and wiring to check for any visible damage or corrosion.
- Test the fuel additive pump to ensure it is functioning correctly and producing the appropriate pressure.
- Use a multimeter to test the voltage in the control circuit and identify any irregularities.
- Check the wiring connections and repair or replace any damaged wires or connectors.
- If the issue persists, consider replacing the fuel additive pump or control module as needed.
Cost to Fix P1933
The typical repair costs for addressing a fuel additive pump control circuit low issue can range from $200 to $500, including parts and labor. However, it is essential to note that diagnosis time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. It is advisable to check local rates for a more accurate estimate.
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Code P1933 Information for Specific Makes
- P1933 Ford — Fuel Additive Pump Control Circuit Low
- P1933 Lincoln — Fuel Additive Pump Control Circuit Low
- P1933 Mazda — Fuel Additive Pump Control Circuit Low
Frequently Asked Questions about P1933 Code
1. What does OBDII code P1933 mean?
P1933 indicates a low voltage issue in the fuel additive pump control circuit, which is responsible for managing the diesel exhaust fluid or fuel additive system.
2. What are common symptoms of code P1933?
Symptoms include an illuminated check engine light, poor exhaust system performance, reduced fuel efficiency, and possible issues with emissions compliance.
3. What causes code P1933?
Common causes include a faulty fuel additive pump, damaged wiring or connectors, a blown fuse, or issues with the power supply to the pump.
4. Can I drive with code P1933?
Driving with this code may lead to increased emissions or reduced engine performance, but it is generally not an immediate safety concern. Prompt repair is recommended.
5. How do I diagnose code P1933?
Diagnosis involves inspecting the wiring and connectors, testing the fuel additive pump, checking fuses, and verifying the voltage levels in the control circuit.
6. How can I fix code P1933?
Repairs may include replacing the fuel additive pump, repairing damaged wiring, replacing blown fuses, or addressing electrical issues in the control circuit.
7. What tools do I need to diagnose code P1933?
You'll need a scan tool, a multimeter for testing voltage, and potentially wiring diagrams for the fuel additive system.
8. Is code P1933 specific to certain vehicles?
Yes, P1933 is typically seen in diesel vehicles equipped with a fuel additive system, such as those that use diesel exhaust fluid (DEF).
9. Can a fuel additive pump failure trigger code P1933?
Yes, a malfunctioning or failed fuel additive pump is one of the main causes of this code.
10. How much does it cost to repair code P1933?
Repair costs vary depending on the issue, but replacing a fuel additive pump can range from $300 to $800, excluding labor.
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