OBD Guide
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P145B

A/C Demand Not Activated During Self Test

P145B is an OBD-II diagnostic trouble code meaning: A/C Demand Not Activated During Self Test. Common causes: air conditioning control unit malfunction, damage to the air conditioner wiring harness. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Air conditioner won't turn on
  • Reduced cooling efficiency
  • Check Engine light comes on
  • Unstable operation of the climate control system

Causes

  • Air conditioning control unit malfunction
  • Damage to the air conditioner wiring harness
  • Faulty relay or fuse
  • Problems with pressure sensors in the system
  • Compressor mechanical problems

How to Fix

  1. Check fuses and relays of the air conditioner
  2. Diagnose the air conditioning control unit
  3. Check the integrity of the wiring harness
  4. Check the refrigerant pressure in the system
  5. Test the operation of the air conditioning compressor

Related codes

P145AP145C

FAQ

What does the P145B code mean?

P145B is an OBD-II diagnostic trouble code that indicates: A/C Demand Not Activated During Self Test

What causes a P145B error code?

The most common causes of P145B include: Air conditioning control unit malfunction; Damage to the air conditioner wiring harness; Faulty relay or fuse; Problems with pressure sensors in the system.

How do I fix a P145B diagnostic trouble code?

To fix P145B: Check fuses and relays of the air conditioner. Diagnose the air conditioning control unit. Check the integrity of the wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P145B?

Yes, but get it checked soon

How much does it cost to fix P145B?

The estimated repair cost for P145B is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat