U1860 Cadillac Code - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
Quick Answer
Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U1860 Cadillac indicates Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2.
- Common causes
- Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U1860 Cadillac Description
What are the Possible Causes of the DTC U1860 Cadillac?
- Faulty Hybrid/EV Powertrain Control Module 2
- Hybrid/EV Powertrain Control Module 2 harness is open or shorted
- Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection
How to Fix the DTC U1860 Cadillac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1860 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about U1860 Cadillac Code
1. What does the OBDII code U1860 mean on a Cadillac?
The U1860 code indicates that the Electric A/C Compressor Control Module has lost communication with the Hybrid/EV Powertrain Control Module 2.
2. What are the common symptoms of the U1860 code?
Symptoms may include the A/C system not functioning, reduced cooling performance, a check engine light, and potential battery or hybrid system warnings.
3. What causes the U1860 code to appear?
Common causes include damaged wiring or connectors, a malfunctioning Electric A/C Compressor Control Module, software issues, or faults in the Hybrid/EV Powertrain Control Module 2.
4. Can I drive with the U1860 code active?
While the vehicle may still be drivable, reduced A/C performance or hybrid system issues could affect comfort and efficiency. It’s best to address the problem promptly.
5. How do you diagnose the U1860 code?
Diagnosis involves checking for communication between the modules using a scan tool, inspecting wiring and connectors for damage, and testing the A/C compressor and related control modules.
6. What repairs can fix the U1860 code?
Repairs may include repairing or replacing damaged wiring, updating module software, or replacing the faulty A/C Compressor Control Module or Hybrid/EV Powertrain Control Module 2.
7. Is the U1860 code specific to Cadillac vehicles?
While the U1860 code can appear on other vehicles, its specific meaning and components affected may vary. For Cadillacs, it’s typically related to the hybrid or EV system and the A/C compressor.
8. Can a weak battery cause the U1860 code?
Yes, a weak or failing hybrid battery or 12V auxiliary battery can disrupt module communication and trigger the U1860 code.
9. How much does it cost to repair the U1860 code on a Cadillac?
Repair costs vary depending on the issue but can range from $150 for wiring repairs to over $1,000 if a module or A/C compressor needs replacement.
10. Can updating the vehicle’s software fix the U1860 code?
In some cases, a software update for the control modules may resolve the communication issue if it’s caused by programming errors.
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