OBD Guide
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U1860

Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2

U1860 is an OBD-II diagnostic trouble code meaning: Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2. Common causes: open or short circuit in the communication circuit, malfunction of the air conditioning compressor control module. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Air conditioner doesn't work
  • Check Engine light comes on
  • Reduced interior cooling efficiency
  • Possible problems with charging a high-voltage battery
  • Errors in other vehicle systems

Causes

  • Open or short circuit in the communication circuit
  • Malfunction of the air conditioning compressor control module
  • Problems with the hybrid/electric transmission control module
  • Poor connection in connectors
  • Software errors in one of the modules

How to Fix

  1. Check the integrity of the wiring harness between the modules
  2. Inspect and clean the contacts in the connectors
  3. Check the power and ground of the compressor control module
  4. Read error codes in other modules
  5. Update module software
  6. Repair only from an authorized dealer

Related codes

U1861U1850U0100

FAQ

What does the U1860 code mean?

U1860 is an OBD-II diagnostic trouble code that indicates: Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2

What causes a U1860 error code?

The most common causes of U1860 include: Open or short circuit in the communication circuit; Malfunction of the air conditioning compressor control module; Problems with the hybrid/electric transmission control module; Poor connection in connectors.

How do I fix a U1860 diagnostic trouble code?

To fix U1860: Check the integrity of the wiring harness between the modules. Inspect and clean the contacts in the connectors. Check the power and ground of the compressor control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1860?

Yes, but get it checked soon

How much does it cost to fix U1860?

The estimated repair cost for U1860 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat