P0651 — Sensor Reference Voltage "B" Circuit/Open
Category: Powertrain Severity: High
Updated:
DTC code P0651 means: Sensor Reference Voltage "B" Circuit/Open. It falls under the "Powertrain" category, with an estimated severity of High. Common causes include shorted sensor on reference circuit "B", damaged wiring and moisture in a connector; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Shorted sensor on reference circuit "B"
- Damaged wiring
- Moisture in a connector
- ECU fault
Symptoms
- Multiple sensor codes
- Limp mode
- Loss of power
How to diagnose it step by step
- Measure reference "B".
- Identify the sensors on the circuit.
- Unplug them one by one.
- Repair the cause.
How to fix it
Same method as P0641 with the sensors on reference circuit "B" (often the accelerator pedal or boost pressure sensor).
Estimated repair cost
$40–300.
Frequently asked questions
What does DTC code P0651 mean?
Sensor Reference Voltage "B" Circuit/Open.
Is code P0651 serious?
Severity High. Have it checked as soon as possible, especially if it affects safety or the catalytic converter.
Can I keep driving with code P0651?
Not recommended.
Related codes
P0641 P0627 P0620 P0615 P0606 P0605 P0604 P0603 P0602 P0601
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