P26D5

What it means

The dedicated supply voltage to the coolant pump module is above operating range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Alternator regulator failed to limit output

  high

  One of the most commonly reported causes for this code — check this first.

• Wiring shorted to a higher-voltage circuit

  low

  Less common, but worth ruling out after the more likely causes.

• Connector pins corroded - high contact resistance

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P26D5 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?