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TuningBot DTC Database · v4.37.15

P0861 Gear Shift Module Communication Circuit Low

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

P · PowertrainNetworkOBD2

What P0861 means

P0861
Gear Shift Module Communication Circuit Low Generic · network Data confidence 90%

The control module detected that the signal in the Gear Shift Module Communication circuit stayed below the expected operating range.

Symptoms

  • Multiple warning lamps possible
  • Functions of the affected module unavailable

Possible causes

  • Wiring
  • short to earth
  • gear shift module
  • ECM/PCM/TCM

Recommended checks

  • Perform a full-module scan to map which modules communicate
  • Check CAN bus resistance and voltages at the diagnostic connector
  • Inspect wiring and connectors of the affected module
  • Check module power supply and grounds
  • Disconnect suspect modules one at a time only with a documented procedure

Related and nearby codes

P08 range
P0800P0801P0802P0803P0804P0805P0806P0807P0808P0809P080AP080BP080CP080DP0810P0811P0812P0813

How to read P0861

P

Powertrain: engine, transmission and driveline systems.

0

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

861

Specific fault index within the subsystem.

Frequently asked questions about P0861

What does P0861 mean?

Gear Shift Module Communication Circuit Low. The control module detected that the signal in the Gear Shift Module Communication circuit stayed below the expected operating range.

Is P0861 generic or manufacturer-specific?

P0861 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0861 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

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

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

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