P233D

What it means

The supply line that powers the solenoid of fuel pressure regulator B is open. Without supply the regulator cannot operate and the ECU cannot maintain rail pressure on this stage; sets when the controller sees no current flow even with the solenoid commanded on.

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

• Supply line open or relay defective

  high

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

• Fuse for regulator B supply blown

  medium

  A plausible cause — test and verify before replacing parts.

• Pin pushed back out of connector body

  low

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

Related help

• Full P233D diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?