P2B29

What it means

The hybrid control module detects that battery pack coolant pump A is running above the calibrated maximum speed without load. Indicates dry running due to coolant loss or air ingestion.

Is it safe to drive?

This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.

Most likely causes

• Coolant loss in battery loop

  high

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

• Air drawn into pump suction

  medium

  A plausible cause — test and verify before replacing parts.

• Pack cell imbalance approaching service threshold

  low

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

Related help

• Full P2B29 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?