P201B: Intake Manifold Runner Control Actuator Supply Voltage Low (Bank 1)
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P201B mean?
The supply voltage feeding the IMRC actuator on bank 1 is below the lower limit — typically a fuse, relay, or harness fault on the supply rail.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Supply fuse blown
- Medium Open supply wire
- Medium Supply relay contacts pitted
Likelihood is a general estimate across vehicles; your make and model may differ.
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P201B in the community
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