P274C

What it means

The third transmission fluid temperature sensor signal is below the lower diagnostic threshold. 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

• Internal short in sensor element

  high

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

• Signal wire shorted to ground

  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 P274C diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?