As the automotive industry continues to evolve, RAM Code P20B8 is quickly becoming a well-known issue among mechanics and car owners worldwide. This code refers to a particular problem with the Diesel Exhaust Fluid (DEF) Reductant Pump Heater Control Circuit High, or in simpler terms, an issue with the DEF heater. This malfunction is caused by a number of factors such as an electrical short, a faulty DEF Supply Pump Assembly, a DEF Dosing Control Unit, and a Powertrain Control Module. In order to identify the source of the problem, it is essential to understand the implications of the malfunction and the possible solutions.
Causes and Solutions to RAM Code P20B8
| Causes | Solutions |
|---|---|
| SCR Module Heater Supply Circuit Shorted to Voltage | Check the wiring of the SCR Module Heater for any signs of damage and replace the damaged wiring. |
| Defective DEF Supply Pump Assembly | Replace the DEF Supply Pump Assembly with a new part. |
| Defective DEF Dosing Control Unit | Replace the DEF Dosing Control Unit with a new part. |
| Faulty Powertrain Control Module | Replace the Powertrain Control Module with a new part. |
SCR Module Heater Supply Circuit Shorted to Voltage
The SCR Module Heater Supply Circuit is responsible for supplying power to the SCR Module Heater. If there is a short in the wiring, it can cause the RAM Code P20B8 to be triggered. To address this issue, mechanics need to inspect the wiring for signs of damage and replace the damaged wiring if necessary.
Defective DEF Supply Pump Assembly
The DEF Supply Pump Assembly is responsible for supplying the DEF fluid to the DEF Dosing Unit. If this part is defective, it can cause the RAM Code P20B8 to be triggered. To resolve this issue, the DEF Supply Pump Assembly needs to be replaced with a new part.
Defective DEF Dosing Control Unit
The DEF Dosing Control Unit is responsible for controlling the amount of DEF fluid that is injected into the exhaust system. If this part is defective, it can cause the RAM Code P20B8 to be triggered. To resolve this issue, the DEF Dosing Control Unit needs to be replaced with a new part.
Faulty Powertrain Control Module
The Powertrain Control Module is responsible for controlling the engine and transmission systems. If this part is faulty, it can cause the RAM Code P20B8 to be triggered. To resolve this issue, the Powertrain Control Module needs to be replaced with a new part.
Conclusion: How to Fix RAM Code P20B8
RAM Code P20B8 is caused by a number of issues, including a short in the SCR Module Heater Supply Circuit, a defective DEF Supply Pump Assembly, a defective DEF Dosing Control Unit, and a faulty Powertrain Control Module. To fix this issue, mechanics need to inspect the wiring for signs of damage, replace the damaged wiring if necessary, replace the DEF Supply Pump Assembly, replace the DEF Dosing Control Unit, and replace the Powertrain Control Module. By taking these steps, mechanics and car owners can successfully fix RAM Code P20B8 and get their cars back on the road.
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