Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble getting enough power to a part that helps control air flow in the engine. It's like a toy not working because the batteries are low.
The P201B code indicates that there is a low voltage condition in the intake manifold runner control actuator circuit for bank 1.
The intake manifold runner control actuator is responsible for adjusting the position of the intake manifold runners to optimize air flow and improve engine efficiency. The P201B code is triggered when the Engine Control Module (ECM) detects that the supply voltage to the actuator is below the expected range, which can affect engine performance.
• Check Engine Light illuminated
• Reduced engine performance
• Poor fuel economy
• Faulty intake manifold runner control actuator
• Wiring issues such as a short or open circuit
• Faulty ECM
ECM: Engine Control Module, the computer that manages engine functions.
Intake Manifold: A part of the engine that distributes air to the cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the voltage supply to the actuator.
• Repair or replace damaged wiring and connectors.
• Replace the intake manifold runner control actuator.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly inspect and maintain wiring and connectors.
• Keep the intake system clean.
• Perform routine engine diagnostics.
Sensor Issue
• Avoid driving the vehicle until the issue is diagnosed.
• Consult a professional mechanic for a thorough inspection.
Check your vehicle's warranty for coverage on engine control components.
This code has been commonly reported in vehicles with aging wiring harnesses or those exposed to harsh environmental conditions.
Moderate – Addressing this issue promptly can prevent further engine performance problems.
Driving with this code may lead to increased emissions and reduced fuel efficiency.
• Engine at operating temperature
• Vehicle in park or neutral
The intake manifold runner control actuator is typically located on the intake manifold of the engine.
Q: Can I drive with a P201B code?
A: It's not recommended to drive with this code, as it can lead to reduced engine performance and increased emissions.
Q: How can I prevent the P201B code from appearing?
A: Regular maintenance and inspections of the intake system and electrical components can help prevent this code.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.