P20B5 RAM Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Open
Quick Answer
The P20B5 diagnostic trouble code (DTC) indicates an issue with the Diesel Exhaust Fluid (DEF) Reductant Pump Heater Control Circuit being open. Common causes include Faulty DEF reductant pump heater, Damaged wiring or connectors in the heater control circuit, Corrosion or contamination in the electrical connections. 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
- P20B5 RAM indicates Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Open.
- Common causes
- Common causes include Faulty DEF reductant pump heater, Damaged wiring or connectors in the heater control circuit, Corrosion or contamination in the electrical connections.
- 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 P20B5 RAM Description
The P20B5 diagnostic trouble code (DTC) indicates an issue with the Diesel Exhaust Fluid (DEF) Reductant Pump Heater Control Circuit being open. In diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems, the DEF reductant pump is responsible for injecting DEF into the exhaust stream to reduce harmful emissions. The heater control circuit is designed to regulate the temperature of the DEF reductant pump to ensure proper operation.
Common Causes of P20B5 RAM
- Faulty DEF reductant pump heater
- Damaged wiring or connectors in the heater control circuit
- Corrosion or contamination in the electrical connections
- Defective SCR system components
- Software issues in the engine control module (ECM)
Symptoms of P20B5 RAM
- Check engine light illuminated
- Reduced engine power or performance
- Poor fuel economy
- Difficulty starting the engine
- Increased emissions
How to Fix P20B5 RAM
- Perform a visual inspection of the DEF reductant pump heater and associated wiring for any visible damage or corrosion.
- Use a multimeter to test the continuity of the heater control circuit and check for any open circuits.
- Replace the DEF reductant pump heater if it is found to be faulty.
- Repair or replace any damaged wiring or connectors in the heater control circuit.
- Clear the DTC and reset the ECM to ensure proper functioning of the SCR system.
Cost to Fix P20B5 RAM
The typical repair costs for addressing a P20B5 DTC can vary depending on the extent of the issue and the specific components that need replacement. On average, the cost of replacing a DEF reductant pump heater can range from $200 to $500, including parts and labor. Additional costs may apply if there are other underlying issues with the SCR system components. It is advisable to consult with a professional mechanic or dealership for a more accurate estimate based on the vehicle's make and model, as well as the local labor rates.
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