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.

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HOMESERVICE MANUALSHYUNDAI2013GENESIS COUPE 2.0T PREMIUMREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALSTARTERBUTTON ENGINE START SYSTEMPDM (POWER DISTRIBUTION MODULE)DTC B1987: SUB MICOM FAILEDDTC DETECTING CONDITION

2013 Hyundai Genesis Coupe 2.0T Premium

DTC B1987: Sub Micom Failed: DTC Detecting Condition

2013 Hyundai Genesis Coupe 2.0T PremiumSECTION DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible Cause
DTC Strategy	NEC MCU Communication Check	Short to ground/power or open in communication circuit of NEC MCU inside PDM Replace PDM (In case It is unable to verify the cause.)
Enable Conditions	PDM power on
Threshold Value	Communication error
Diagnostic Time	Immediately
DTC Erasing Time	DTC is erased immediately after trouble fixed.

RENDER: 1.0x

NO RELATED

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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.