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TuningBot DTC Database · v4.37.14

P085B Gear Shift Control Module "B" Communication Circuit Low

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

P · PowertrainNetworkOBD2

What P085B means

P085B
Gear Shift Control Module "B" Communication Circuit Low Generic · network Data confidence 78%

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

Symptoms

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

Possible causes

  • CAN bus wiring fault (open, short, chafed harness)
  • Faulty control module loading the bus
  • Connector or terminal corrosion
  • Power supply or ground fault of a module

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 P085B

P

Powertrain: engine, transmission and driveline systems.

0

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

85B

Specific fault index within the subsystem.

Frequently asked questions about P085B

What does P085B mean?

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

Is P085B generic or manufacturer-specific?

P085B is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P085B 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)

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