P0651 Honda Code - Sensor Reference Voltage 'B' Circuit Malfunction
Quick Answer
The Powertrain Control Module (PCM) is equipped with a voltage monitor (5 V power source) to supply a stable 5 V to each sensor as a reference voltage. Common causes include A/C pressure sensor VCC line short to power, Accelerator Pedal Position (APP) sensor VCC line short to power, Turbocharger VCC line short to power. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0651 Honda indicates Sensor Reference Voltage 'B' Circuit Malfunction.
- Common causes
- Common causes include A/C pressure sensor VCC line short to power, Accelerator Pedal Position (APP) sensor VCC line short to power, Turbocharger VCC line short to power.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0651 Honda Description
What are the Possible Causes of the DTC P0651 Honda?
- A/C pressure sensor VCC line short to power
- Accelerator Pedal Position (APP) sensor VCC line short to power
- Turbocharger VCC line short to power
- Turbocharger boost sensor VCC line short to power
- Camshaft Position (CMP) sensor A VCC line short to power
- CMP sensor B VCC line short to power
- A/C pressure sensor VCC line short to ground
- APP sensor A/B VCC line short to ground
- Turbocharger VCC line short to ground
- Turbocharger boost sensor VCC line short to ground
- CMP sensor A VCC line short to ground
- CMP sensor B VCC line short to ground
- EVAP leak check module internal circuit failure
- Powertrain Control Module (PCM) internal circuit failure
How to Fix the DTC P0651 Honda?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0651 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Honda Models
- P0651 2016 Honda CR-V — Sensor Reference Voltage 'B' Circuit Malfunction
- P0651 2017 Honda CR-V — Sensor Reference Voltage 'B' Circuit Malfunction
- P0651 2018 Honda CR-V — Sensor Reference Voltage 'B' Circuit Malfunction
- P0651 2019 Honda CR-V — Sensor Reference Voltage 'B' Circuit Malfunction
- P0651 2020 Honda CR-V — Sensor Reference Voltage 'B' Circuit Malfunction
- P0651 2021 Honda CR-V — Sensor Reference Voltage 'B' Circuit Malfunction
Frequently Asked Questions about P0651 Honda Code
1. What are common symptoms of OBDII code P0651 in a Honda?
- Common symptoms include rough idling, poor engine performance, illuminated Check Engine light, and potential stalling.
2. What causes the Sensor Reference Voltage 'B' Circuit Malfunction (P0651) in a Honda?
- The most common causes are a faulty sensor, damaged wiring or connectors, a short circuit, or a malfunctioning Engine Control Module (ECM).
3. How can I diagnose the Sensor Reference Voltage 'B' Circuit Malfunction in my Honda?
- To diagnose P0651, conduct a visual inspection of the wiring and connectors, check the sensor's resistance, test the voltage output, and use a scan tool to monitor live data.
4. Can driving with an unresolved P0651 code damage my Honda?
- Continuing to drive with P0651 may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.
5. How can I repair OBDII code P0651 in my Honda?
- Repair options include replacing the faulty sensor, repairing damaged wiring or connectors, addressing any short circuits, and resetting the ECM to clear the code.
6. Is it safe to reset the ECM to clear the P0651 code myself?
- Yes, it is safe to reset the ECM by disconnecting the battery for a few minutes. However, if the underlying issue is not addressed, the code may reappear.
7. How much does it typically cost to repair the Sensor Reference Voltage 'B' Circuit Malfunction in a Honda?
- The cost of repair varies depending on the specific issue causing the code, but it can range from $100 to $500 or more, including parts and labor.
8. Can a DIY enthusiast fix the P0651 code in a Honda?
- Depending on your automotive repair skills and tools, it is possible for a DIY enthusiast to address P0651 by replacing the sensor, checking wiring, and resetting the ECM.
9. How urgent is it to address the Sensor Reference Voltage 'B' Circuit Malfunction in my Honda?
- While your vehicle may still be driveable with P0651, it is recommended to address the issue promptly to prevent further engine damage and ensure optimal performance.
10. Are there any recalls or technical service bulletins related to OBDII code P0651 in Honda vehicles?
- It is recommended to check with your local Honda dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to this specific code.
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