P2B6A: Coolant Pump D Stuck/Stalled

P2B6A reports that coolant pump D is blocked or stalled: supply and command are present, yet the rotor does not come up to speed. No manufacturer documents the code publicly. Ford uses the identical failure type 71 (actuator stuck) for pump B as P2B63 and for pump A as P2B9C, and GM's patent US20160047374A1 explains how deviations of measured current and speed from expected values expose a faulty electric coolant pump. Seized bearings, an impeller jammed by debris or sludge, frozen coolant and a failed motor winding are typical. Before condemning the pump, confirm its supply (P2B69) and its control signal. Air in the pump points to P2B6C instead, overheated pump electronics to P2B6B. Pump C has the counterpart P26F8.

Medium severity. Can I keep driving?Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

Symptoms

Warning lamp with stored code
Pump D silent although commanded
Overheating of the loop served by pump D

Most likely causes

Bearing seized or impeller jammed by debris or sludge
Motor winding or pump electronics failed
Coolant frozen because antifreeze concentration is too low

What to check, in order

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

With the engine cold, check the coolant level; never do this when the system is hot
Use the scanner to command the movement and compare the actual position with the requested one.
Check the actual temperature in live data
Make sure the fan comes on when it should
Check the thermostat and connector
Measure the sensor and replace it if its readings do not make sense

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2B6A means

P: Powertrain: engine and transmission
2: Generic code: same on every make
B: Subsystem depends on the code range
6A: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2B6A?

Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

What causes code P2B6A?

The most common causes are: bearing seized or impeller jammed by debris or sludge; motor winding or pump electronics failed; coolant frozen because antifreeze concentration is too low.

Related codes

Sources

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.