P27A4

What it means

Voltage on the second auxiliary transmission fluid pump control line is below the expected window. 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?

This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly.

Most likely causes

• Control wire shorted to ground

  high

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

• Motor winding short

  medium

  A plausible cause — test and verify before replacing parts.

• Connector pins corroded - high contact resistance

  low

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

Related help

• Full P27A4 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?