OBD Guide
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B2458

Auxiliary Heater Overheat Sensor Circuit Short to Ground

B2458 is an OBD-II diagnostic trouble code meaning: Auxiliary Heater Overheat Sensor Circuit Short to Ground. Common causes: damage to sensor wiring, short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of the additional heater
  • Switching off the heating system
  • Check Engine Light Illuminates

Causes

  • Damage to sensor wiring
  • Short circuit in wiring harness
  • Malfunction of the overheat sensor itself
  • Sensor connection problems

How to Fix

  1. Check the integrity of the sensor wiring
  2. Check the resistance of the overheating sensor
  3. Inspect connectors and connections for corrosion or damage
  4. If necessary, replace the sensor or repair the wiring

Related codes

B2457B2459B2460

FAQ

What does the B2458 code mean?

B2458 is an OBD-II diagnostic trouble code that indicates: Auxiliary Heater Overheat Sensor Circuit Short to Ground

What causes a B2458 error code?

The most common causes of B2458 include: Damage to sensor wiring; Short circuit in wiring harness; Malfunction of the overheat sensor itself; Sensor connection problems.

How do I fix a B2458 diagnostic trouble code?

To fix B2458: Check the integrity of the sensor wiring. Check the resistance of the overheating sensor. Inspect connectors and connections for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2458?

Limited driving only, diagnose soon

How much does it cost to fix B2458?

The estimated repair cost for B2458 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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