Hours: 07–23 daily

TuningBot DTC Database · v4.37.15

P0851 Park / Neutral Switch Input Circuit Low

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainTransmissionOBD2

What P0851 means

P0851
Park / Neutral Switch Input Circuit Low Generic · transmission Data confidence 90%

The control module detected that the signal in the Park / Neutral Switch Input circuit stayed below the expected operating range.

Possible causes

  • Wiring
  • short to earth
  • PNP switch
  • ECM/PCM/TCM

Related and nearby codes

How to read P0851

P

Powertrain: engine, transmission and driveline systems.

0

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

851

Specific fault index within the subsystem.

Frequently asked questions about P0851

What does P0851 mean?

Park / Neutral Switch Input Circuit Low. The control module detected that the signal in the Park / Neutral Switch Input circuit stayed below the expected operating range.

Is P0851 generic or manufacturer-specific?

P0851 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0851 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database