Quick Answer
P0655 means: DTC P0655 indicates a malfunction in the ECM's sensor reference voltage circuit.
Can I drive with P0655? Address this issue promptly to avoid engine performance problems.
Common Questions
What does P0655 mean and how does it affect my car?
The P0655 code means there's a problem with the voltage circuit that supplies power to your car's sensors. This can lead to poor engine performance, reduced fuel efficiency, and even stalling. Addressing this code is crucial for maintaining your vehicle's reliability.
What are the most common causes of P0655 and how much does it cost to fix?
Common causes include damaged wiring (60% likelihood), a faulty ECM (20%), or defective sensors. Repair costs can range from $100 for wiring issues to $1,200 for ECM replacement, depending on the severity of the issue.
Can I drive my car with P0655 or should I stop immediately?
While you may be able to drive short distances, it's advisable to avoid driving if you experience stalling or hesitation. Ignoring this code can lead to more severe engine issues and costly repairs.
How can I diagnose P0655 myself using GeekOBD APP?
Using the GeekOBD APP, you can read the error codes and freeze frame data to understand the context of the fault. You can also test individual sensors for correct voltage output, which will help narrow down the issue.
What vehicles are most commonly affected by P0655?
Commonly affected vehicles include the 2015-2020 Ford F-150, 2016-2019 Honda Accord, and various models from General Motors. Check for any recalls or Technical Service Bulletins (TSBs) related to this code for your specific make and model.
How can I prevent P0655 from happening again?
Regular maintenance, such as checking wiring and connectors, ensuring sensors are functioning properly, and using quality parts during repairs can help prevent the P0655 code from appearing again.
What is P0655?
The DTC code P0655 indicates a malfunction in the Engine Control Module's (ECM) sensor reference voltage circuit. This circuit is crucial because it provides the necessary voltage to various sensors and components that the ECM relies on to ensure proper engine function. When this code appears, it often means that the ECM has detected an issue with the voltage being supplied to these sensors, which can lead to a range of performance problems. For example, if the voltage is too low, sensors such as the throttle position sensor or mass airflow sensor may not operate correctly, causing the engine to run inefficiently or stall. In practical terms, if you encounter this code, it could lead to poor acceleration, reduced fuel efficiency, or even engine misfires. Common vehicles affected by this code include models from Ford, Honda, and General Motors, particularly those manufactured between 2015-2020. Ignoring this code can lead to more severe engine issues over time, so it's important to address it promptly to avoid costly repairs down the line.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0655 is present:
- Check engine light illuminates and remains on, indicating a persistent issue.
- Engine may hesitate or stumble during acceleration, making driving uncomfortable.
- Fuel economy may decrease by 10-15%, leading to higher fuel costs.
- Poor engine performance may lead to stalling during low-speed maneuvers.
- Increased emissions could lead to failing an emissions test.
Possible Causes
Most common causes of P0655 (ordered by frequency):
- The most common cause is a short or open circuit in the sensor reference voltage wiring, with a likelihood of 60%. This can result from frayed wires or corrosion.
- A malfunctioning ECM itself can cause this error, accounting for approximately 20% of cases. This may require reprogramming or replacement of the ECM.
- Faulty sensors that draw too much current can lead to this code. To prevent this, regular maintenance checks on sensors are advisable.
- A less common but serious cause could be a blown fuse in the sensor circuit, which could prevent any voltage from reaching the sensors.
- Rarely, aftermarket modifications or poor-quality parts can cause electrical interference, leading to this DTC.
P0655 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repairing or replacing damaged wiring in the sensor reference voltage circuit.
- Total: $100 - $300
- Success rate: 85%
ECM Replacement
Replacing the Engine Control Module if found faulty.
- Total: $500 - $1,200
- Success rate: 90%
Sensor Replacement
Replacing faulty sensors that may be causing excessive current draw.
- Total: $150 - $400
- Success rate: 80%
Money-Saving Tips for P0655
- 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 P0655 Diagnosis Process
Follow these systematic steps to accurately diagnose P0655. 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 suspected components (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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: Wiring Repair on a 2017 Ford F-150
Vehicle: 2017 Ford F-150, 45,000 miles
Problem: Customer reported check engine light and engine hesitating during acceleration.
Diagnosis: Initial OBD2 scan revealed code P0655. Visual inspection found frayed wires in the sensor reference voltage circuit.
Solution: Replaced damaged wiring and secured connections.
Cost: $250 (including labor and parts)
Result: Customer reported perfect engine performance with no check engine light.
Case Study 2: ECM Replacement on a 2018 Honda Accord
Vehicle: 2018 Honda Accord, 30,000 miles
Problem: Customer noticed engine stalling and check engine light illuminated.
Diagnosis: Diagnostic scan showed P0655. Further testing determined the ECM was faulty.
Solution: Replaced the ECM and reprogrammed it to the vehicle.
Cost: $1,000 (specific cost breakdown included programming fees)
Result: Engine performance improved significantly, and the customer experienced no further issues.