OBD Guide
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B1857

Climate Control On/Off Switch Circuit Failure

B1857 is an OBD-II diagnostic trouble code meaning: Climate Control On/Off Switch Circuit Failure. Common causes: broken wires in the button circuit, short circuit in the circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Climate control does not turn on/off
  • Incorrect operation of the climate control system
  • Check Engine light comes on

Causes

  • Broken wires in the button circuit
  • Short circuit in the circuit
  • Malfunction of the on/off button
  • Wiring harness damage
  • Problems with the climate control unit

How to Fix

  1. Check the integrity of the wires in the button circuit
  2. Check the button for sticking or damage.
  3. Inspect the wiring harness for damage
  4. Check the contacts on the connectors
  5. If necessary, replace the button or wiring harness

Related codes

B1858B1859B1860

FAQ

What does the B1857 code mean?

B1857 is an OBD-II diagnostic trouble code that indicates: Climate Control On/Off Switch Circuit Failure

What causes a B1857 error code?

The most common causes of B1857 include: Broken wires in the button circuit; Short circuit in the circuit; Malfunction of the on/off button; Wiring harness damage.

How do I fix a B1857 diagnostic trouble code?

To fix B1857: Check the integrity of the wires in the button circuit. Check the button for sticking or damage.. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1857?

Limited driving only, diagnose soon

How much does it cost to fix B1857?

The estimated repair cost for B1857 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat