P20B7 RAM Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low
Quick Answer
The Powertrain Control Module (PCM) controls the Diesel Exhaust Fluid (DEF) Heaters via datalink communication with the Diesel Exhaust Fluid Dosing Control Unit (DEF DCU - sometimes referred to as the Selective Catalytic Reduction (SCR) Module). Common causes include Selective Catalytic Reduction (SCR) Module Circuit, Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU), Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted. 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
- P20B7 RAM indicates Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low.
- Common causes
- Common causes include Selective Catalytic Reduction (SCR) Module Circuit, Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU), Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted.
- 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.
Code P20B7 RAM Description
Activation of the DEF Supply Line and DEF Tank Heaters operate independently of each other. Line heating is based on the Ambient Temperature Sensor input and Tank heating is based on the DEF Tank Temperature Sensor value. Heating of the Line or Tank Heater is initiated when the corresponding temperature value is below -5°C (23°F). Heating stops when the corresponding temperature value goes above -4°C (24.8°F). The DEF Dosing Control Unit monitors these inputs and reports them to the Powertrain Control Module (PCM). The PCM will illuminate the MIL lamp after this diagnostic runs and fails. The PCM will turn off the MIL light when the monitor runs and passes in three consecutive key cycles. The Diagnostic Trouble Code (DTC) will be set when the DEF Dosing Control Unit detects low voltage on the SCR Module Heater Supply circuit.
What are the Possible Causes of the DTC P20B7 RAM?
- Selective Catalytic Reduction (SCR) Module Circuit
- Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU)
- Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted
- Diesel Exhaust Fluid Dosing Control Unit circuit poor electrical connection
- Faulty Power Distribution Center
How to Fix the DTC P20B7 RAM?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P20B7 RAM code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P20B7 RAM Code
1. What are the common symptoms of OBDII code P20B7 RAM?
The common symptoms of code P20B7 include the check engine light illuminating, reduced engine performance, and potential issues with the diesel exhaust fluid system.
2. What does the OBDII code P20B7 RAM indicate?
Code P20B7 indicates a low voltage condition in the control circuit of the diesel exhaust fluid reductant pump heater.
3. What are the possible causes of OBDII code P20B7 RAM?
Possible causes of code P20B7 include a faulty reductant pump heater, damaged wiring or connectors in the control circuit, a blown fuse, or a malfunctioning powertrain control module (PCM).
4. How can I diagnose OBDII code P20B7 RAM?
Diagnosing code P20B7 typically involves using a scan tool to retrieve the code and then testing the reductant pump heater, inspecting wiring and connectors for damage, checking fuses, and verifying the PCM operation.
5. Can I drive my vehicle with OBDII code P20B7 RAM?
It is not recommended to drive your vehicle with code P20B7 present, as it can lead to reduced engine performance and potential damage to the diesel exhaust fluid system.
6. How can I repair OBDII code P20B7 RAM?
Repairing code P20B7 may involve replacing the reductant pump heater, repairing damaged wiring or connectors, replacing blown fuses, or reprogramming the PCM if necessary.
7. Is OBDII code P20B7 RAM a serious issue?
Code P20B7 should be addressed promptly to prevent further damage to the diesel exhaust fluid system and ensure proper vehicle performance.
8. Can a DIY enthusiast fix OBDII code P20B7 RAM?
Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair code P20B7, especially if the issue is related to wiring or fuse problems.
9. How much does it cost to repair OBDII code P20B7 RAM?
The cost of repairing code P20B7 can vary depending on the exact cause of the issue, but it may involve parts and labor costs ranging from $200 to $800 or more, depending on the extent of the repairs needed.
10. How often does OBDII code P20B7 RAM occur in vehicles?
Code P20B7 RAM is not extremely common but can occur in vehicles equipped with a diesel exhaust fluid system and reductant pump heater.
Discuss the causes and fixes for P20B7 RAM OBDII Code
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