P1929 Code - Fuel Additive Level Pump Control Circuit Performance
Quick Answer
The P1929 diagnostic trouble code (DTC) indicates a problem with the fuel additive level pump control circuit's performance in the vehicle. Common causes include Faulty Fuel Additive Level Pump: The pump itself may be malfunctioning, causing issues with the control circuit's performance, Wiring Issues: Damaged or corroded wiring connections to the fuel additive level pump can disrupt the circuit's operation, ECM Malfunction: A problem with the Engine Control Module (ECM) could be causing incorrect signals to be sent to the fuel additive level pump. 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
- P1929 indicates Fuel Additive Level Pump Control Circuit Performance.
- Common causes
- Common causes include Faulty Fuel Additive Level Pump: The pump itself may be malfunctioning, causing issues with the control circuit's performance, Wiring Issues: Damaged or corroded wiring connections to the fuel additive level pump can disrupt the circuit's operation, ECM Malfunction: A problem with the Engine Control Module (ECM) could be causing incorrect signals to be sent to the fuel additive level pump.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1929 Description
The P1929 diagnostic trouble code (DTC) indicates a problem with the fuel additive level pump control circuit's performance in the vehicle. This code is typically found in vehicles equipped with a diesel engine that utilizes a diesel exhaust fluid (DEF) system. The fuel additive level pump is responsible for transferring DEF from the tank to the exhaust system to reduce harmful emissions.
Common Causes of P1929
- Faulty Fuel Additive Level Pump: The pump itself may be malfunctioning, causing issues with the control circuit's performance.
- Wiring Issues: Damaged or corroded wiring connections to the fuel additive level pump can disrupt the circuit's operation.
- ECM Malfunction: A problem with the Engine Control Module (ECM) could be causing incorrect signals to be sent to the fuel additive level pump.
- DEF Contamination: Contaminated DEF in the tank can lead to clogs or damage to the fuel additive level pump.
- Software Issues: Software glitches or updates can sometimes cause communication errors between the ECM and the fuel additive level pump.
Symptoms of P1929
- Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the dashboard.
- Reduced Fuel Efficiency: A decrease in fuel efficiency may be noticed due to improper dosing of DEF into the exhaust system.
- Emissions Issues: The vehicle may fail emissions tests due to increased emissions caused by the malfunctioning fuel additive level pump control circuit.
- Engine Performance Issues: The vehicle may experience a decrease in engine performance, such as reduced power or rough idling.
How to Fix P1929
- Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and pinpoint the exact cause of the problem.
- Inspect Wiring and Connections: Check the wiring harness and connections to the fuel additive level pump for any damage or corrosion.
- Test Fuel Additive Level Pump: Test the fuel additive level pump to ensure it is functioning properly.
- Replace Faulty Components: If the pump or wiring is found to be faulty, replace the necessary components.
- Clear Codes and Test Drive: Clear the DTC from the ECM, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1929
The cost of repairing a P1929 DTC can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary between $80 and $150 per hour, and additional diagnostic time may be needed to pinpoint the exact cause of the problem. It's recommended to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model.
Need more information about the P1929 code?
Need more information on how to fix the P1929 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1929 code diagnosed by a professional: Find a repair shop in your area
Code P1929 Information for Specific Makes
- P1929 Ford — Fuel Additive Level Pump Control Circuit Performance
- P1929 Lincoln — Fuel Additive Level Pump Control Circuit Performance
- P1929 Mazda — Fuel Additive Level Pump Control Circuit Performance
- P1929 Mercury — Fuel Additive Level Pump Control Circuit Performance
Frequently Asked Questions about P1929 Code
No Frequently Asked Questions about P1929 Code found.
Discuss the causes and fixes for P1929 OBDII Code
Code P1929 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.