P2B67: Coolant Pump D Control Circuit Low

P2B67 means the control line of coolant pump D sits too low, typically because it is shorted to ground or the driver stage sees excess current. No manufacturer publishes this code. Ford's comparable entries for pumps A and B (P2602, P261C) set when the smart driver in the engine computer reports an output fault, checked continuously above 11 V. Chafed insulation against body or engine, water in the connector and an internally shorted pump input are the usual suspects. Depending on how the output is wired, a ground short can leave the pump running nonstop or silence it completely. With the pump unplugged, measure the resistance of the signal wire to ground before replacing parts. Open circuit is P2B66, short to voltage P2B68; pump C has P26F5.

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 runs constantly or not at all

Most likely causes

Control wire chafed through and shorted to ground
Moisture or corrosion in the pump connector
Control input inside the pump shorted

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
With the connector unplugged, check whether the signal wire is making contact with ground.
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 P2B67 means

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

Frequently asked questions

Can I keep driving with code P2B67?

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 P2B67?

The most common causes are: control wire chafed through and shorted to ground; moisture or corrosion in the pump connector; control input inside the pump shorted.

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.