P2766

What it means

The second input shaft speed sensor reading is implausible against the primary sensor. 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

• Damaged tone wheel teeth

  high

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

• Sensor air gap drift

  medium

  A plausible cause — test and verify before replacing parts.

• Sensor element aged beyond calibration window

  low

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

Related help

• Full P2766 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?