Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Under-Hood Fuse/Relay Box DTCS
/Relay Box DTCS Under-Hood Fuse/Relay Box DTCS UNDER-HOOD FUSE/RELAY BOX DIAGNOSTIC TROUBLE CODE (DTC) INDENTIFICATION DTC Description B1055 Relay Control Module Lost Communication With MICU B1056 Relay Control Module Lost Communication With MICU (Alarm Message) B1057 Relay Control Module Lost Communication With MICU (Door Switch Message) B1058 Relay Control Module Lost Communication With Door Multiplex Control Unit (Door Lock Switch Message) B1059 Relay Control Module lost communication with Door Multiplex Control Unit (panic message) B1060 Relay Control Module lost communication with Gauge Control Module (VSP/NE message) B1061 Relay Control Module Lost Communication With Gauge Control Module (A/T Message) B1062 Relay Control Module Lost Communication With Combination Switch Control Unit (Headlight Switch Message) B1063 Relay Control Module Lost Communication With Combination Switch Control Unit (Wiper Switch Message)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.