P2020 - Understanding DTC P2020: Common Issues in 2015-2018 Ford F-150 and More

Quick Answer

P2020 means: P2020 indicates a problem with the diesel exhaust fluid quality sensor circuit.

Fix: Check and replace faulty components Cost: $200 - $400 Time: 90-180 minutes

Can I drive with P2020? Immediate attention is required to avoid performance issues and possible damage.

Common Questions

What does P2020 mean and how does it affect my car?

P2020 indicates a problem with the diesel exhaust fluid quality sensor. This can lead to reduced engine performance and increased emissions, impacting both the environment and your vehicle's efficiency.

What are the most common causes of P2020 and how much does it cost to fix?

Common causes include a faulty DEF quality sensor and damaged wiring. Repair costs can range from $100 to $400 depending on the issue.

Can I drive my car with P2020 or should I stop immediately?

While you can drive with the P2020 code, it is not advisable. The vehicle may enter limp mode, restricting power and speed, which could lead to further damage if ignored.

How can I diagnose P2020 myself using GeekOBD APP?

Using the GeekOBD APP, perform an OBD2 scan to identify the P2020 code and any related codes. Check live data readings for the DEF sensor to assess its function.

What vehicles are most commonly affected by P2020?

Commonly affected vehicles include the 2015-2018 Ford F-150, RAM 2500, and various other diesel models from manufacturers like Chevrolet and GMC.

How can I prevent P2020 from happening again?

Regular maintenance is key. Ensure you use compliant DEF fluid and have the DEF system inspected during routine service to catch any potential issues early.

What is P2020?

Diagnostic Trouble Code (DTC) P2020 refers to an issue with the diesel exhaust fluid (DEF) quality sensor circuit. This code typically indicates that the signal from the DEF quality sensor is out of the expected range, meaning the engine control module (ECM) has detected a problem with the quality of the diesel exhaust fluid being used. The DEF system is crucial for reducing emissions in diesel engines, particularly in vehicles like the 2015-2018 Ford F-150, RAM 2500, and other diesel-powered trucks. When the P2020 code triggers, you may experience a check engine light, and the vehicle may enter a limp mode to prevent further damage. Common symptoms include reduced engine performance and potential increases in emissions. Ignoring this code can lead to further complications, including costly repairs and failed emissions tests. It's essential to address the issue promptly to maintain your vehicle's performance and comply with environmental regulations.

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

Symptoms

Common symptoms when P2020 is present:

  • Check engine light remains on continuously, indicating a fault in the DEF system.
  • Engine performance may hesitate or lag during acceleration, affecting driving experience.
  • Fuel economy may decrease by 10-20%, leading to higher fuel costs.
  • Increased emissions detected during inspections, which could lead to failed emissions tests.
  • Possible limp mode activation, restricting vehicle speed and power to prevent damage.

Possible Causes

Most common causes of P2020 (ordered by frequency):

  1. The most common cause is a faulty DEF quality sensor, with a likelihood of about 60%. This sensor may fail due to contaminants in the DEF.
  2. A wiring issue, such as damaged or corroded wires in the DEF sensor circuit, accounts for around 25% of cases. This can prevent proper signal transmission.
  3. A clogged DEF injector can lead to incorrect readings and eventual failure of the DEF system, which is a less common cause but important to check.
  4. Less common but serious causes include a malfunctioning engine control module (ECM), which can lead to incorrect readings and performance issues.
  5. In rare cases, using non-compliant DEF fluid can trigger the P2020 code, leading to sensor damage and expensive repairs.

P2020 Repair Costs

Cost Breakdown by Repair Type

DEF Quality Sensor Replacement

Replacing the faulty DEF quality sensor to restore proper function.

  • Total: $200 - $400
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring in the DEF circuit to ensure proper signal transmission.

  • Total: $100 - $300
  • Success rate: 75%
Money-Saving Tips for P2020
  • 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 P2020 Diagnosis Process

Follow these systematic steps to accurately diagnose P2020. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Perform an initial visual inspection to check for damaged wiring, loose connections, or signs of corrosion in the DEF system (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: Use the GeekOBD APP to conduct an OBD2 scan to retrieve all codes and freeze frame data, helping to understand the context of the fault (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: Conduct component testing on the DEF quality sensor using a multimeter to check for proper voltage and signal output (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: After repairs, perform a system function test to verify that the DEF system operates correctly and clear the 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 the vehicle under various conditions to confirm the fix and ensure no further codes are triggered (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: DEF Quality Sensor Replacement in a 2017 Ford F-150

Vehicle: 2017 Ford F-150, 45,000 miles

Problem: Customer reported check engine light and reduced engine performance.

Diagnosis: OBD2 scan revealed P2020 and indicated a faulty DEF quality sensor.

Solution: Replaced the DEF quality sensor and cleared the codes.

Cost: $350 (sensor $200, labor $150)

Result: Customer reported improved performance and no further codes after the repair.

Case Study 2: Wiring Repair on a 2016 RAM 2500

Vehicle: 2016 RAM 2500, 60,000 miles

Problem: Check engine light on, with noticeable hesitation during acceleration.

Diagnosis: Visual inspection found corroded wiring in the DEF circuit leading to the P2020 code.

Solution: Repaired the damaged wiring and ensured a proper connection.

Cost: $250 (parts $50, labor $200)

Result: Post-repair, the vehicle performed normally with no check engine light.

Diagnose P2020

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: P2020
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes