P20B2 - Understanding DTC P20B2: Common Code in 2013-2018 Ford Diesel Engines

Quick Answer

P20B2 means: P20B2 indicates a problem with the reductant heater in the SCR system of diesel engines.

Fix: Check and replace faulty components Cost: $300 - $600 Time: 90-180 minutes

Can I drive with P20B2? Immediate attention is advised to prevent further damage to the SCR system.

Common Questions

What does P20B2 mean and how does it affect my car?

P20B2 indicates an issue with your vehicle's reductant heater, which is crucial for the SCR system's function. If ignored, this could lead to poor emissions performance, higher fuel consumption, and potential engine damage.

What are the most common causes of P20B2 and how much does it cost to fix?

The most frequent cause of P20B2 is a failed reductant heater, which typically costs between $300 and $600 to replace. Other causes include wiring issues and clogged DEF, with repair costs varying based on the problem.

Can I drive my car with P20B2 or should I stop immediately?

While you may still drive your vehicle, it is not advisable to ignore the P20B2 code. Continued operation can lead to increased emissions and may cause further damage to the SCR system.

How can I diagnose P20B2 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view live data to monitor the SCR system, and check for any related codes. This will help you assess whether the issue is isolated to the reductant heater or if there are additional problems.

What vehicles are most commonly affected by P20B2?

P20B2 is often seen in 2013-2018 Ford Super Duty trucks with the 6.7L Power Stroke diesel engine, as well as some models of the Dodge Ram from similar years.

How can I prevent P20B2 from happening again?

Regular maintenance of your SCR system and using high-quality DEF can prevent P20B2 from recurring. Additionally, inspect the wiring and connectors during routine checks to catch any potential issues early.

What is P20B2?

The diagnostic trouble code (DTC) P20B2 refers to a problem with the reductant heater performance, specifically in the context of the Selective Catalytic Reduction (SCR) system used in diesel engines. This code is commonly triggered in vehicles like the 2013-2018 Ford Super Duty trucks equipped with the 6.7L Power Stroke diesel engine. The reductant heater is crucial for warming up the urea solution (diesel exhaust fluid, or DEF) to ensure optimal performance of the SCR system, which reduces harmful NOx emissions. When the PCM (Powertrain Control Module) detects that the reductant heater is not functioning effectively, it sets the P20B2 code. This situation can lead to increased emissions and potential failures in emission tests. Ignoring this code can result in reduced fuel efficiency and ultimately damage to the SCR system, leading to costly repairs. If you experience this code, it is important to address it promptly to maintain vehicle performance and compliance with emissions regulations.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P20B2 is present:

  • The check engine light illuminates continuously, indicating a fault with the SCR system.
  • You may notice a decrease in fuel economy, often by 10-15%, due to inefficient exhaust treatment.
  • The vehicle may exhibit rough idling or hesitations during acceleration, particularly under load.
  • You might experience increased exhaust emissions, which could lead to failed emissions testing.
  • In severe cases, the vehicle may enter limp mode, restricting power and speed.

Possible Causes

Most common causes of P20B2 (ordered by frequency):

  1. The most common cause is a failed reductant heater, occurring in approximately 70% of cases, often due to corrosion or electrical failure.
  2. Another cause can be wiring issues, such as frayed or damaged wires, which can interrupt the heater's operation and is often overlooked during routine inspections.
  3. Clogged or contaminated DEF can lead to heater failure, so it's essential to use high-quality DEF and replace it regularly.
  4. Less commonly, a malfunctioning PCM can incorrectly trigger the P20B2 code, requiring a software update or replacement.
  5. A rare but serious cause could be a defective SCR system that leads to complete failure, necessitating extensive repairs.

P20B2 Repair Costs

Cost Breakdown by Repair Type

Reductant Heater Replacement

Replacing the failed reductant heater with a new OEM part to restore functionality.

  • Total: $300 - $600
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring that may be causing the heater failure.

  • Total: $100 - $300
  • Success rate: 80%
Money-Saving Tips for P20B2
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P20B2 Diagnosis Process

Follow these systematic steps to accurately diagnose P20B2. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Component testing - Use a multimeter to test the voltage at the reductant heater connector and ensure it meets specifications (20-30 minutes)
GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: System function test - Verify proper operation of the heater after repairs and clear codes using the GeekOBD APP (10-15 minutes)
GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any reoccurring codes (15-20 minutes)
GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Ford Super Duty Reductant Heater Replacement

Vehicle: 2015 Ford F-250 Super Duty, 85,000 miles

Problem: Customer reported a check engine light and poor fuel economy.

Diagnosis: Scanned with GeekOBD APP and confirmed P20B2. Visual inspection revealed corrosion on the reductant heater connector.

Solution: Replaced the reductant heater and repaired wiring connections.

Cost: $450 (parts: $300 for heater, $150 labor)

Result: Check engine light cleared and fuel economy improved by 15%.

Case Study 2: 2016 Dodge Ram SCR System Repair

Vehicle: 2016 Dodge Ram 2500, 70,000 miles

Problem: Customer experienced rough idling and emissions test failure.

Diagnosis: P20B2 was triggered due to a faulty reductant heater. Further testing showed DEF contamination.

Solution: Replaced the heater and flushed the SCR system.

Cost: $500 (parts: $350 for heater, $150 for system flush)

Result: Vehicle passed emissions test and performance returned to normal.

Diagnose P20B2

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P20B2
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes