P0651 Acura 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 Acura 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 Acura Description
What are the Possible Causes of the DTC P0651 Acura?
- 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 Acura?
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 Acura 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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Frequently Asked Questions about P0651 Acura Code
What does the OBDII code P0651 mean for an Acura?
P0651 indicates a malfunction in the Sensor Reference Voltage "B" circuit, which signals an issue with the 5-volt reference circuit provided to certain sensors.
What are the common symptoms of code P0651 in an Acura?
Symptoms may include poor engine performance, reduced fuel efficiency, engine hesitation, or stalling, as well as the Check Engine Light being illuminated.
What causes the P0651 code to appear in an Acura?
Common causes include a short or open in the sensor reference voltage circuit, damaged wiring, a faulty sensor requiring the reference voltage, or a malfunctioning Engine Control Module (ECM/PCM).
Can a faulty sensor trigger the P0651 code?
Yes, a sensor that relies on the "B" circuit reference voltage, such as the throttle position sensor or MAP sensor, can fail and cause this code.
How do you diagnose the P0651 code in an Acura?
Diagnosis involves checking the wiring and connectors for damage, testing the reference voltage with a multimeter, inspecting related sensors, and ensuring the ECM is functioning correctly.
Is the P0651 code safe to drive with?
Driving with this code is not recommended as it can lead to poor engine performance, stalling, and potential safety issues.
How do you fix the P0651 code in an Acura?
Repairs may include repairing or replacing damaged wiring, fixing poor connections, replacing a faulty sensor, or replacing the ECM if it’s defective.
How much does it cost to repair a P0651 code in an Acura?
The repair cost varies depending on the issue, typically ranging from $50 to $200 for wiring repairs or sensor replacement, while ECM replacement can cost several hundred dollars.
Can a dead battery cause the P0651 code to appear?
While a dead battery itself may not cause P0651, low voltage or electrical issues stemming from battery problems could potentially affect the reference voltage circuit.
Do I need to reprogram the ECM if it’s replaced to fix the P0651 code?
Yes, if the ECM is replaced, it typically needs to be programmed to match your Acura’s specific make, model, and configuration.
Discuss the causes and fixes for P0651 Acura OBDII Code
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