P2B5C

Engine Coolant Flow Control Valve Supply Circuit Low

Moderate severity

The engine coolant flow control valve reports a supply circuit low condition. Coolant routing between engine and radiator branches cannot be commanded as expected.

Common causes

Supply fuse blown
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $170-770
Open in supply wire
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $170-770
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P2B5C mean?

P2B5C means "Engine Coolant Flow Control Valve Supply Circuit Low". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P2B5C?

supply fuse blown; open in supply wire; connector pins corroded - high contact resistance — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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