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.

2010 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

DTC B2271: Ignition Hold Monitor Malfunction: Description

This DTC is output when the IG output circuits inside the main body ECU are open or shorted.

DTC Code

Detection Condition

Trouble Area

B2271

D-IG1 relay actuation circuit or IG2 relay actuation circuit inside main body ECU is abnormal

Main body ECU

AM2 fuse

Harness or connector

Factory Service Tools

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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.

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