B1266 - Instrument Panel System Communication Bus Malfunction Short To Battery

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Engine Control Module (ECM)
  • Faulty Multi Display ECU
  • Faulty A/C ECU
  • Faulty Combination Meter ECU
  • The harness is open or shorted between ECU
  • ECU circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B1266 Description

This Diagnostic Trouble Code (DTC) is output when +B (Battery) or GND (Ground) short occurs on instrument panel system communication bus (Engine Control Module, Multi Display, A/C ECU and Combination Meter ECU). If +B or GND short is detected on instrument panel system communication bus, separate it by bus cut relay in body ECU to prevent while communication buses failure.
OBDII Code B1266 - Instrument Panel System Communication Bus Malfunction Short To Battery - AutoCodes.com

B1266 Information for specific makes

  • B1266 LEXUS Instrument Panel System Communication Bus Malfunction Short To Battery
  • B1266 SCION Instrument Panel System Communication Bus Malfunction Short To Battery
  • B1266 TOYOTA Instrument Panel System Communication Bus Malfunction Short To Battery

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Related Information

B1266 Comments

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