Engine-Codes - Generic - B1266

B1266 - Instrument Panel System Communication Bus Malfunction Short To Battery

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B1266 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

How is the B1266 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the B1266 code

Labor: 1.0

The cost to diagnose the B1266 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

B1266 Meaning

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.

More Information

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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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