P20B8 RAM Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit High
Quick Answer
The P20B8 code indicates a problem with the Diesel Exhaust Fluid (DEF) reductant pump heater control circuit being too high. Common causes include Malfunctioning heater element, Short circuit in the wiring, Faulty control module. 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
- P20B8 RAM indicates Diesel Exhaust Fluid Reductant Pump Heater Control Circuit High.
- Common causes
- Common causes include Malfunctioning heater element, Short circuit in the wiring, Faulty control module.
- 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 P20B8 RAM Description
The P20B8 code indicates a problem with the Diesel Exhaust Fluid (DEF) reductant pump heater control circuit being too high. The reductant pump heater is responsible for heating the DEF fluid to prevent freezing in cold temperatures and ensure proper emission control. When this circuit is high, it means that there is an issue with the control of the heater, which can impact the performance of the vehicle.
Common Causes of P20B8 RAM
- Malfunctioning heater element
- Short circuit in the wiring
- Faulty control module
- Electrical system issue
- Corrosion or damage to the heater components
Symptoms of P20B8 RAM
- Check engine light illuminated on the dashboard
- Reduced fuel efficiency
- Vehicle going into reduced power mode
- Increased emissions
- DEF fluid freezing in cold temperatures
How to Fix P20B8 RAM
- Diagnose the exact cause of the high voltage issue by using a scan tool to read the code and testing the reductant pump heater components.
- Inspect the wiring for any signs of damage or corrosion and repair or replace as necessary.
- Test the heater element to ensure it is functioning properly and replace if needed.
- Check the control module for any faults and replace if it is found to be the cause of the high voltage.
- Clear the code from the vehicle's computer system and test drive to ensure the issue has been resolved.
Cost to Fix P20B8 RAM
The typical repair costs for resolving a P20B8 code can range from $200 to $500, depending on the exact cause of the issue and the cost of parts and labor in your area. Keep in mind that additional diagnostic time and labor costs may apply, so it's best to consult with a professional mechanic for a more accurate estimate based on your specific vehicle.
Need more information about the P20B8 RAM code?
Need more information on how to fix the P20B8 RAM code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P20B8 RAM code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P20B8 RAM Code
No Frequently Asked Questions about P20B8 RAM Code found.
Discuss the causes and fixes for P20B8 RAM OBDII Code
Code P20B8 RAM 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.