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TuningBot DTC Database · v4.37.14

P0651 Diagnostic Trouble Code (3 variants)

Generic (OBD-II) interpretation + 1 manufacturer-specific in the TuningBot DTC database.

P · PowertrainEngineOBD2
Brand pages:Ford

Generic (OBD-II) interpretation

P0651
Sensor Reference Voltage B Circuit/Open Generic · engine Data confidence 90%

The control module detected an interruption (open circuit) in the Sensor Reference Voltage B circuit, so the expected electrical continuity was not present.

Possible causes

Wiring short to positive

Manufacturer-specific interpretations

Ford

3 interpretations
P0651:16
Sensor Reference Voltage "B" Circuit Low Ford · engine Data confidence 94%

Ford documents P0651:16 (circuit voltage below threshold) for its 2024-2025 gasoline-engine OBD monitor strategy as sensor reference voltage "b" circuit low. This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Inspect relevant wiring and connectors
  • Check power supplies and grounds
  • Compare commanded and measured values
  • Check applicable OEM service information
Applies to Ford gasoline-engine OBD applications|2024-2025 model years
P0651:17
Sensor Reference Voltage "B" Circuit High Ford · engine Data confidence 94%

Ford documents P0651:17 (circuit voltage above threshold) for its 2024-2025 gasoline-engine OBD monitor strategy as sensor reference voltage "b" circuit high. This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Inspect relevant wiring and connectors
  • Check power supplies and grounds
  • Compare commanded and measured values
  • Check applicable OEM service information
Applies to Ford gasoline-engine OBD applications|2024-2025 model years
P0651:1C
Sensor Reference Voltage "B" Circuit Range/Performance Ford · engine Data confidence 94%

Ford documents P0651:1C for its 2024-2025 gasoline-engine OBD monitor strategy as sensor reference voltage "b" circuit range/performance. This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Inspect relevant wiring and connectors
  • Check power supplies and grounds
  • Compare commanded and measured values
  • Check applicable OEM service information
Applies to Ford gasoline-engine OBD applications|2024-2025 model years

Related and nearby codes

Related codes
P0652P0653P06A7
P06 range
P0600P0601P0602P0603P0604P0605P0606P0607P0608P0609P060AP060BP060CP060DP060EP060FP0610P0611

How to read P0651

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

651

Specific fault index within the subsystem.

Frequently asked questions about P0651

What does P0651 mean?

Diagnostic Trouble Code (3 variants). The control module detected an interruption (open circuit) in the Sensor Reference Voltage B circuit, so the expected electrical continuity was not present.

Is P0651 generic or manufacturer-specific?

P0651 exists both as a generic OBD-II code (same meaning on every make) and with 1 manufacturer-specific interpretation(s): Ford. Always read it in the context of your vehicle.

Can TuningBot remove P0651 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

ECU tuningStage 1 dyno results for Ford engines See the results →

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