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TuningBot DTC Database · v4.37.15

U3027 Control Module A Disable Circuit High

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

U · NetworkNetworkOBD2

What U3027 means

U3027
Control Module A Disable Circuit High Generic · network Data confidence 65%

The control module detected that the signal in the Control Module A Disable circuit stayed above 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

U30 range
U3000U3001U3002U3003U3004U3005U3006U3007U3008U3009U300AU300BU300CU300DU300EU300FU3010U3011

How to read U3027

U

Network: communication between control units.

3

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

027

Specific fault index within the subsystem.

Frequently asked questions about U3027

What does U3027 mean?

Control Module A Disable Circuit High. The control module detected that the signal in the Control Module A Disable circuit stayed above the expected operating range.

Is U3027 generic or manufacturer-specific?

U3027 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U3027 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U3027 is removable in your case.

Other file services

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