Quick Answer
P0659 means: P0659 indicates a fault in the sensor reference voltage circuit A.
Can I drive with P0659? Immediate attention is recommended to prevent further engine issues.
Common Questions
What does P0659 mean and how does it affect my car?
P0659 indicates an issue with the sensor reference voltage, affecting how your engine sensors communicate with the ECM. This can lead to performance problems like reduced fuel efficiency and rough idling.
What are the most common causes of P0659 and how much does it cost to fix?
Common causes include faulty sensors or wiring issues, which can typically cost between $150 - $300 to repair. Reprogramming the ECM can cost around $100 - $200.
Can I drive my car with P0659 or should I stop immediately?
While it may be drivable, it’s advisable to address the P0659 code as soon as possible to avoid further engine damage and ensure safe driving conditions.
How can I diagnose P0659 myself using GeekOBD APP?
You can use the GeekOBD APP to scan for DTCs, check the live data of your sensors, and monitor voltage levels to identify which components need inspection or replacement.
What vehicles are most commonly affected by P0659?
P0659 is often found in 2015-2018 Honda Accord, various Ford models, and Chevrolet vehicles. Checking for service bulletins can provide additional context on recalls.
How can I prevent P0659 from happening again?
Regular vehicle maintenance, including checking electrical connections and grounding, can help prevent issues that lead to P0659. Keeping your vehicle’s software updated is also essential.
What is P0659?
DTC P0659 refers to a problem with the 'Sensor Reference Voltage A' circuit. This code indicates that the Engine Control Module (ECM) has detected a fault in the voltage reference supplied to various sensors in the vehicle. In simpler terms, it means that one or more sensors are not receiving the correct voltage level, which can lead to inaccurate readings. This is critical because many engine functions rely on these sensors for proper operation. If this code appears, you may notice performance issues such as decreased fuel efficiency, rough idling, or even stalling. It’s essential to address this issue promptly because prolonged driving with a faulty sensor can lead to more severe engine problems and costly repairs. Commonly seen in vehicles like the 2015-2018 Honda Accord and some models from Ford and Chevrolet, a P0659 code is often accompanied by other codes that can help in pinpointing the exact issue. Repairing this problem typically involves checking wiring, connectors, and the sensors themselves to ensure they are functioning correctly.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0659 is present:
- Check engine light stays on constantly, indicating a persistent issue with the sensor circuit.
- Engine hesitates during acceleration, making driving unpredictable and potentially dangerous.
- Fuel economy decreased by 10-15%, leading to increased fuel expenses.
- Rough idling when the vehicle is stationary, which may cause vibrations and discomfort.
- Stalling at low speeds or during stops, especially in heavy traffic situations.
Possible Causes
Most common causes of P0659 (ordered by frequency):
- The most common cause is a faulty sensor or wiring issue, with a likelihood of 60%. Over time, wires can wear out or connections can become corroded, leading to an unreliable voltage supply.
- A second common cause is a malfunctioning Engine Control Module (ECM), which can misinterpret sensor data. This may require reprogramming or replacement of the ECM.
- Thirdly, poor grounding in the vehicle's electrical system can lead to voltage fluctuations that trigger the P0659 code. Regular maintenance can help prevent this by ensuring all connections are clean and tight.
- A less common but serious cause could be a short circuit within the wiring harness, which can cause significant damage if left unaddressed.
- A rare cause includes software glitches in the vehicle's onboard computer systems, which might necessitate a software update or complete system reset.
P0659 Repair Costs
Cost Breakdown by Repair Type
Sensor Replacement
Replacing faulty sensors that are identified as causing the P0659 code.
- Total: $150 - $300
- Success rate: 80%
ECM Reprogramming
Reprogramming the Engine Control Module to correct sensor data interpretation issues.
- Total: $100 - $200
- Success rate: 70%
Money-Saving Tips for P0659
- 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 P0659 Diagnosis Process
Follow these systematic steps to accurately diagnose P0659. 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 voltage levels at the sensors and inspect the wiring for continuity (20-30 minutes)
Step 3: Component testing - Use a multimeter to test voltage levels at the sensors and inspect the wiring for continuity (20-30 minutes).
Step 4: Step 4: System function test - After repairs, verify proper operation by clearing codes and checking system response (10-15 minutes)
Step 4: System function test - After repairs, verify proper operation by clearing codes and checking system response (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes reappear (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes reappear (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: P0659 Diagnosis and Repair on a 2016 Honda Accord
Vehicle: 2016 Honda Accord, 60,000 miles
Problem: Customer reported a persistent check engine light and engine stalling.
Diagnosis: Initial scans showed P0659 and associated codes. Visual inspection revealed corroded wiring in the sensor circuit.
Solution: Repaired the damaged wiring and replaced the faulty voltage sensor.
Cost: $250 (parts and labor breakdown: $50 - wiring repair, $200 - sensor replacement)
Result: Check engine light cleared, and the vehicle ran smoothly after repair.
Case Study 2: Resolving P0659 on a 2017 Ford Fusion
Vehicle: 2017 Ford Fusion, 45,000 miles
Problem: Customer experienced rough idling and decreased fuel efficiency.
Diagnosis: Found P0659 along with a faulty ECM due to software issues.
Solution: Reprogrammed the ECM and replaced a damaged ground wire.
Cost: $300 (breakdown: $200 - ECM reprogramming, $100 - wiring repair)
Result: Vehicle performance improved significantly after the fix.