Quick Answer
P0117 means: DTC P0117 signifies a low voltage from the coolant temperature sensor.
Can I drive with P0117? Immediate attention is recommended to prevent engine damage.
Common Questions
What does P0117 mean and how does it affect my car?
DTC P0117 means your engine's coolant temperature sensor is sending a low voltage signal. This can cause poor fuel efficiency, engine overheating, and performance issues. Addressing this quickly can prevent long-term engine damage.
What are the most common causes of P0117 and how much does it cost to fix?
Common causes include a faulty coolant temperature sensor, damaged wiring, or ECM issues. Repair costs typically range from $100 to $300 depending on the specific repair needed.
Can I drive my car with P0117 or should I stop immediately?
It's advised to avoid driving if you see the P0117 code, as it can lead to overheating or severe engine damage. Stop driving and have it diagnosed as soon as possible.
How can I diagnose P0117 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for codes, view freeze frame data, and monitor real-time sensor readings to identify if the ECT sensor is malfunctioning.
What vehicles are most commonly affected by P0117?
Commonly affected vehicles include the 2003-2015 Ford F-150, 2010-2015 Toyota Camry, and 2015-2018 Honda Civic. Be sure to check for recalls related to the ECT sensor.
How can I prevent P0117 from happening again?
Regular maintenance of your cooling system, such as checking coolant levels, inspecting wiring, and replacing worn components can help prevent P0117 from recurring.
What is P0117?
DTC P0117 indicates a low voltage signal from the Engine Coolant Temperature (ECT) sensor, which monitors the coolant temperature and sends this information to the engine control module (ECM). When the ECM receives a voltage reading that is lower than expected, it triggers this diagnostic trouble code. This situation can lead to poor engine performance, increased emissions, and potentially damage the engine over time if not addressed. The ECT sensor is vital for optimal fuel management, as it helps the ECM adjust fuel mixture based on engine temperature. Real-world implications include poor fuel economy, rough idling, or even overheating if the engine isn't receiving the correct temperature readings. Vehicles like the 2015-2018 Honda Civic and 2010-2015 Chevrolet Silverado have also been reported to experience this issue, highlighting the importance of timely diagnosis and repair.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0117 is present:
- Check engine light stays on constantly, indicating a fault in the engine management system that needs attention.
- Engine hesitates during acceleration, particularly noticeable when trying to merge onto highways or during quick stops.
- Fuel economy decreased by 10-15%, which can lead to higher fuel expenses over time due to inefficient engine operation.
- Overheating engine, as the incorrect temperature readings can cause the engine to work harder without proper cooling.
- Erratic temperature gauge readings, where the dashboard temperature gauge fluctuates unexpectedly.
Possible Causes
Most common causes of P0117 (ordered by frequency):
- Faulty ECT sensor (70% likelihood) - The most common cause of P0117 is a malfunctioning coolant temperature sensor that fails to send the correct signal to the ECM.
- Wiring issues (15% likelihood) - Damaged or corroded wiring and connectors can disrupt the signals, leading to inaccurate readings.
- ECM malfunction (10% likelihood) - A rare but possible issue where the engine control module itself isn't processing signals correctly.
- Coolant leaks (less common) - Low coolant levels can lead to inaccurate sensor readings, prompting incorrect signals.
- Poor electrical connections (rare) - Loose or corroded connections can also result in low voltage readings at the sensor.
P0117 Repair Costs
Cost Breakdown by Repair Type
ECT Sensor Replacement
Replacing the faulty engine coolant temperature sensor with an OEM part.
- Total: $100 - $300
- Success rate: 90%
Wiring Repair
Repairing or replacing damaged wiring or connectors related to the ECT sensor.
- Total: $50 - $150
- Success rate: 85%
Money-Saving Tips for P0117
- 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 P0117 Diagnosis Process
Follow these systematic steps to accurately diagnose P0117. 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 to test the ECT sensor for proper voltage output (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the ECT sensor for proper voltage output (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation of the sensor and clear codes after any repairs (10-15 minutes)
Step 4: System function test - Verify proper operation of the sensor and clear codes after any repairs (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm the fix (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm the fix (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: 2012 Ford F-150 ECT Sensor Replacement
Vehicle: 2012 Ford F-150, 85,000 miles
Problem: Customer reported check engine light and poor fuel economy.
Diagnosis: After scanning with GeekOBD APP, P0117 was confirmed. Physical inspection revealed a corroded ECT sensor.
Solution: Replaced ECT sensor and cleared the code.
Cost: $150 (sensor $100, labor $50)
Result: Customer reported improved fuel economy and no check engine light.
Case Study 2: 2015 Toyota Camry Wiring Repair
Vehicle: 2015 Toyota Camry, 60,000 miles
Problem: Engine overheating and fluctuating temperature gauge.
Diagnosis: GeekOBD APP revealed P0117 and visual inspection found damaged wiring.
Solution: Repaired wiring connections and replaced the ECT sensor.
Cost: $200 (wiring $100, sensor $100)
Result: Temperature gauge stabilized and overheating issue resolved.