B1266 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1266 – Instrument Panel System Communication Bus Malfunction Short To Battery
B1266 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
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
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.