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U0295 — Lost Communication Acac Converter Control Module

Generic OBD-II · all makesNetwork / communication

Code U0295 indicates that the vehicle's main control network has lost communication with the Air Conditioning Compressor (ACAC) Control Module. This results in the compressor failing to operate because the system cannot send or receive necessary operating data.

Symptoms

What causes it — most likely first

1. Wiring Harness Damage

Chafed, broken, or corroded communication wires between the main controller and the compressor module.

2. Loss of Power or Ground

A blown fuse or corroded ground connection preventing the compressor control module from powering up.

3. Failed Compressor Control Module

Internal electronic failure of the ACAC module, rendering it unable to communicate on the network.

4. Loose Connector

A poorly seated or corroded electrical connector at the compressor module.

5. Main Control Module Failure

A failure in the PCM or gateway module preventing communication with the ACAC module.

How it's diagnosed

  1. Check all fuses related to the HVAC and AC compressor systems.
  2. Inspect the wiring harness leading to the AC compressor for visible damage or corrosion.
  3. Verify that the ACAC control module is receiving the correct voltage and has a secure ground.
  4. Test for continuity and resistance on the communication lines (CAN or LIN) between the module and the main computer.
  5. Perform a network scan to determine if other modules are also experiencing communication loss.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0290 — Lost Communication Active Aerodynamic U0291 — Lost Communication Gear Shift Control U0292 — Lost Communication Drive Motor ControlU0293 — Lost Communication Hybridev PowertrainU0294 — Lost Communication Powertrain Control U0296 — Lost Communication Acdc Converter Cont

Frequently asked

Does this code mean my AC compressor is mechanically broken?

Not necessarily. This is a communication error; the compressor's mechanical components may be intact, but the electronic control module is not communicating.

Should I replace the engine computer (PCM) to fix this?

No. Communication codes are most often caused by wiring faults or the peripheral module itself. Replacing the PCM is rarely the correct first step and is usually unnecessary.

Will adding more refrigerant clear this code?

No. U0295 is an electrical communication fault, not a refrigerant level issue. Adding gas will not restore network communication.