P2031 - Diesel Exhaust Fluid Temperature Sensor Range/Performance Problem in 2011-2018 Ford Super Duty and 2013-2018 Ram 2500

Quick Answer

P2031 means: P2031 indicates a problem with the DEF temperature sensor circuit in diesel vehicles.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with P2031? Immediate diagnosis recommended to prevent engine performance issues.

Common Questions

What does P2031 mean and how does it affect my car?

The P2031 code signals a problem with the Diesel Exhaust Fluid temperature sensor in your diesel vehicle. If this sensor fails, it can lead to poor engine performance, increased emissions, and potential limp mode, affecting your overall driving experience.

What are the most common causes of P2031 and how much does it cost to fix?

The most common causes of the P2031 code include a faulty DEF temperature sensor, which can cost between $100 and $300 to replace, and wiring issues, which may cost about $50 to $200 to repair. Addressing these issues promptly is essential to avoid further complications.

Can I drive my car with P2031 or should I stop immediately?

While it may be possible to drive short distances with a P2031 code, it is not recommended. Ignoring this code can result in reduced engine power and potential damage to the emissions system, so it's best to have it diagnosed and repaired as soon as possible.

How can I diagnose P2031 myself using GeekOBD APP?

To diagnose the P2031 code using the GeekOBD APP, connect the scanner to your vehicle's OBD2 port, retrieve the trouble code, and access freeze frame data for context. Check the sensor readings and perform a visual inspection of the wiring and connectors for any visible damage.

What vehicles are most commonly affected by P2031?

The P2031 code is commonly seen in 2011-2018 Ford Super Duty models and 2013-2018 Ram 2500 trucks. If you own one of these vehicles, be aware of this code's implications and monitor your DEF system closely.

How can I prevent P2031 from happening again?

To prevent the P2031 code from recurring, ensure regular maintenance of your DEF system, including checking for leaks, using quality DEF fluid, and inspecting the temperature sensor and wiring periodically.

What is P2031?

The P2031 diagnostic trouble code (DTC) indicates a problem with the Diesel Exhaust Fluid (DEF) temperature sensor circuit. This sensor is crucial in diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems, as it monitors the temperature of the DEF fluid to ensure optimal performance and emissions control. When the engine control module (ECM) detects that the temperature reported by the DEF temperature sensor is out of range or inconsistent with expected values, it triggers the P2031 code. This can lead to various performance issues, including reduced engine power, increased emissions, and potential failure to meet environmental regulations. If left unaddressed, a malfunctioning DEF temperature sensor can cause the vehicle to enter limp mode, where performance is significantly restricted to prevent further damage. Owners of models like the Ford Super Duty (2011-2018) or Ram 2500 (2013-2018) may notice a check engine light illuminated on their dashboard, accompanied by poor engine performance and possible fuel economy loss. It's essential to address this issue promptly to maintain vehicle performance and compliance with emissions standards.

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

Symptoms

Common symptoms when P2031 is present:

  • The check engine light remains on constantly, alerting you to potential issues with the DEF system.
  • Engine power may decrease significantly during acceleration, resulting in sluggish performance and delayed throttle response.
  • You may observe a decrease in fuel economy by 10-15%, leading to more frequent trips to the fuel station.
  • The vehicle may enter limp mode, restricting speed and acceleration to protect the engine and emissions systems.
  • In some cases, you might hear unusual engine noises as the system struggles to function correctly.

Possible Causes

Most common causes of P2031 (ordered by frequency):

  1. The most common cause is a faulty DEF temperature sensor, accounting for about 60% of cases. This sensor can fail due to exposure to high temperatures or contamination.
  2. A wiring issue, such as damaged or corroded connectors within the sensor circuit, is the second most common cause (30%). These wiring problems can interrupt the signal sent to the ECM.
  3. A clogged or contaminated DEF injector may also contribute to the P2031 code, as it can affect fluid delivery and temperature readings. Regular maintenance can prevent this issue.
  4. Less commonly, a malfunctioning ECM could misinterpret sensor data, leading to erroneous P2031 codes. This is a more serious concern that may require extensive diagnostic testing.
  5. In rare cases, the DEF tank itself may be damaged, causing sensor readings to be inaccurate. This requires thorough inspection and potentially replacement of the tank.

P2031 Repair Costs

Cost Breakdown by Repair Type

DEF Temperature Sensor Replacement

Replacing the faulty DEF temperature sensor with a new one.

  • Total: $100 - $300
  • Success rate: 90%
Wiring Harness Repair

Repairing or replacing damaged wiring or connectors in the DEF sensor circuit.

  • Total: $50 - $200
  • Success rate: 80%
Money-Saving Tips for P2031
  • 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 P2031 Diagnosis Process

Follow these systematic steps to accurately diagnose P2031. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Conduct a visual inspection of the DEF temperature sensor and wiring harness for any signs of damage, corrosion, or loose connections (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 an OBD2 scanner, such as the GeekOBD APP, to retrieve the P2031 code and any other related codes, along with freeze frame data to analyze the issue's 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: Test the DEF temperature sensor using a multimeter to check for proper voltage output and resistance (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: Perform a system function test after any repairs to ensure all components are operating correctly and clear the codes (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: Take the vehicle for a road test under various conditions to confirm that the repairs have resolved the issue and the system is functioning normally (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 Temperature Sensor Replacement on 2015 Ford F-250

Vehicle: 2015 Ford F-250, 75,000 miles

Problem: Customer reported a check engine light and reduced engine power.

Diagnosis: After scanning the vehicle, P2031 was confirmed, and visual inspection showed a damaged DEF temperature sensor.

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

Cost: $250 (parts $150, labor $100)

Result: Customer reported improved performance and no further check engine light.

Case Study 2: Wiring Repair on 2017 Ram 2500

Vehicle: 2017 Ram 2500, 60,000 miles

Problem: Check engine light illuminated with P2031 code.

Diagnosis: Inspection revealed corroded connectors in the sensor circuit.

Solution: Repaired the wiring and cleaned connections.

Cost: $150 (parts $20, labor $130)

Result: Vehicle passed inspection with no further issues.

Diagnose P2031

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: P2031
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes