Quick Answer
U0172 means: U0172 indicates a communication failure between the ECM and the fuel level sensor module.
Can I drive with U0172? Immediate attention is recommended to prevent fuel system issues.
Common Questions
What does U0172 mean and how does it affect my car?
The U0172 code signifies a breakdown in communication between the Engine Control Module and the fuel level sensor. This can lead to inaccurate fuel gauge readings, potentially causing you to run out of fuel unexpectedly. Long-term, it can affect your vehicle's drivability and fuel efficiency.
What are the most common causes of U0172 and how much does it cost to fix?
Common causes include a failed fuel level sensor, damaged wiring, or blown fuses. Repair costs typically range from $100 to $300, depending on the specific issue and parts required.
Can I drive my car with U0172 or should I stop immediately?
While you may still drive your car, it is not advisable to ignore the U0172 code. Driving without accurate fuel level readings can lead to running out of fuel unexpectedly, which can be dangerous and cause further damage.
How can I diagnose U0172 myself using GeekOBD APP?
Using the GeekOBD APP, start by connecting to your vehicle’s OBD2 port and retrieving all diagnostic codes. Look specifically for U0172 and related codes, then check the freeze frame data for conditions at the time the code was logged.
What vehicles are most commonly affected by U0172?
The U0172 code is commonly found in models like the 2015-2018 Ford F-150, 2016-2018 Chevrolet Silverado, and 2017-2019 Honda CR-V. Always check for recalls or Technical Service Bulletins (TSBs) related to fuel system issues in your vehicle.
How can I prevent U0172 from happening again?
Regularly inspect your vehicle’s wiring and connectors, especially in the fuel system. Additionally, using quality fuel and maintaining your vehicle can help prevent sensor failures.
What is U0172?
The U0172 diagnostic trouble code indicates a communication issue between the Engine Control Module (ECM) and the Fuel Level Sensor Module. This means that the ECM is unable to receive or send data to the fuel level sensor, which is essential for monitoring the fuel level in your vehicle’s tank. A breakdown in this communication can lead to inaccurate fuel readings, impacting your vehicle’s performance and fuel efficiency. If the fuel level sensor fails, you might experience significant inconveniences such as running out of fuel unexpectedly or having the check engine light illuminated on your dashboard. This code is often accompanied by other DTCs, making it crucial to perform a comprehensive diagnostic scan to identify any related issues. Such failures can be due to wiring problems, blown fuses, or a malfunctioning sensor itself. It's important to address this code promptly, as ignoring it may lead to further complications in your vehicle’s fuel system and overall drivability.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0172 is present:
- Check engine light stays on constantly, indicating a persistent communication error.
- Inaccurate fuel gauge readings, leading to confusion over how much fuel is actually in the tank.
- Engine stalls or hesitates due to incorrect fuel level readings affecting performance.
- Frequent fuel tank empty warnings despite having fuel, causing driver frustration.
- Potentially poor fuel economy due to the engine running inefficiently without proper fuel data.
Possible Causes
Most common causes of U0172 (ordered by frequency):
- The most common cause is a failed fuel level sensor, with an estimated 60% likelihood. This occurs when the sensor's internal components wear out or fail due to age or exposure to fuel.
- Another likely cause is damaged wiring or connectors between the fuel level sensor and the ECM, accounting for about 25% of cases. Corrosion or wear can disrupt necessary electrical signals.
- A blown fuse related to the fuel level sensor circuit can lead to a total loss of communication, though this is less common, representing around 10% of issues.
- Less frequently, a malfunctioning ECM can cause communication failures, which is a serious issue requiring professional diagnostics.
- In rare cases, software glitches in the vehicle's onboard systems can lead to false readings or communication errors.
U0172 Repair Costs
Cost Breakdown by Repair Type
Fuel Level Sensor Replacement
Replacing the faulty fuel level sensor with an OEM part to restore communication.
- Total: $150 - $300
- Success rate: 95%
Wiring Repair
Repairing or replacing damaged wiring or connectors between the fuel level sensor and ECM.
- Total: $100 - $200
- Success rate: 90%
Money-Saving Tips for U0172
- 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 U0172 Diagnosis Process
Follow these systematic steps to accurately diagnose U0172. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fuel level sensor and its connections (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fuel level sensor and its connections (20-30 minutes).
Step 4: Step 4: System function test - Verify the proper operation after repairs and clear the codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify the proper operation after repairs and clear the codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure accurate fuel readings (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure accurate fuel readings (15-20 minutes).
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: Fuel Level Sensor Replacement on 2016 Ford F-150
Vehicle: 2016 Ford F-150, 45,000 miles
Problem: Customer reported inconsistent fuel gauge readings and check engine light.
Diagnosis: Scanned vehicle with GeekOBD APP and retrieved U0172 along with other codes indicating sensor issues.
Solution: Replaced the faulty fuel level sensor and repaired damaged wiring between the sensor and ECM.
Cost: $250 (sensor $150, labor $100)
Result: Customer reported accurate fuel gauge readings and no further issues after repair.
Case Study 2: Wiring Repair on 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado, 60,000 miles
Problem: Driver experienced check engine light and incorrect fuel level indications.
Diagnosis: Performed a visual inspection and found corroded wiring harness, confirmed with DTC U0172.
Solution: Repaired the wiring harness and resealed connectors to prevent future corrosion.
Cost: $150 (labor $100, parts $50)
Result: Fuel gauge readings returned to normal, and check engine light cleared.