P201C: Intake Manifold Runner Control Actuator Supply Voltage Low (Bank 2)

P201C reports that the electric flap actuator of bank 2 is not getting enough supply voltage. It only makes sense on V engines that give each bank its own powered actuator. No manufacturer documents P201C publicly. The bank 1 counterpart P201B is described by GM for its DC-motor swirl drive: the driver supply below 6 V while the relay feed is above 11 V, in 240 of 300 samples, Type B. That logic separates a weak battery, which would also pull the relay feed down, from a loss on the branch to the actuator. CARB treats such actuators as comprehensive output components and requires circuit faults to be found continuously. In practice the search starts at the fuse and supply pin of the bank 2 actuator. If both banks report a supply fault at once, look for a shared fuse or relay first.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

• Malfunction indicator lamp on
• Bank 2 flaps stop working

Most likely causes

• Fuse or relay feeding the bank 2 actuator failed
• Damaged supply wire or connector at the bank 2 actuator
• Actuator electronics loading the supply down

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the vacuum hoses and the connector
2. With the connector unplugged, check whether the signal wire is making contact with ground.
3. Watch the actuator's movement with the scanner
4. Inspect the manifold for carbon buildup
5. Replace the actuator if it does not follow the command

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P201C means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 0: Subsystem depends on the code range
• 1C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P201C?

You can drive in moderation. Get it repaired soon, because a loose flap can cause major damage on some engines.

What causes code P201C?

The most common causes are: fuse or relay feeding the bank 2 actuator failed; damaged supply wire or connector at the bank 2 actuator; actuator electronics loading the supply down.

Related codes

• P201BIntake Manifold Runner Control Actuator Supply Voltage Low (Bank 1)
• P201EIntake Manifold Runner Control Actuator Internal Performance (Bank 2)
• P2011Intake Manifold Runner Control Circuit/Open (Bank 2)
• P200BIntake Manifold Runner Performance (Bank 2)

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 25OBDG04B

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.