OBD Guide

B3A1B

A/C System Pressure - Too High

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

Symptoms

  • Air conditioner doesn't work
  • Noise from under the hood
  • Compressor overheating

Causes

  • Recharging refrigerant
  • Pressure sensor malfunction
  • Clogged air conditioner circuit
  • Condenser fan malfunction

How to Fix

  1. Check system pressure
  2. Check pressure sensor
  3. Clean the air conditioner circuit
  4. Replace faulty components

Related codes

Error B3A1B by Vehicle Brand