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Home / DTC / U1110 — A/C CAN timeout/Not equipped

U1110 — A/C CAN timeout/Not equipped

Detailed page for trouble code U1110.

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U1110

MITSUBISHI U — Network/User

A/C CAN timeout/Not equipped

Brand: MITSUBISHI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • A/C control module (HVAC) not present/configured for vehicle option
  • Loss of power or ground to the A/C control module
  • Open or short in CAN‑H or CAN‑L wiring to A/C module
  • Poor connector contacts or corrosion at A/C control module or gateway connectors
  • Faulty A/C control module (internal failure)
  • Bus termination resistor missing or shorted, causing bus errors

Symptoms

  • A/C/HVAC controls unresponsive or display blank
  • HVAC blower controls or mode functions inoperative or limited
  • Air‑conditioning compressor does not engage (no control command)
  • Multiple communication U‑codes present in different modules
  • Instrument cluster or climate info incorrect or missing
  • Possible MIL or warning messages related to communication

What to check

  • Read freeze frame and full DTC list from all modules with a capable scan tool
  • Check history — verify whether code is present with ignition on and engine off and whether intermittent
  • Verify vehicle option list to confirm A/C control unit should be present (not equipped scenario)
  • Inspect fuses and relays supplying HVAC/A/C control module power and ignition feed
  • Visually inspect connectors and harnesses at A/C control unit and gateway for corrosion, bent pins, damage
  • Using a multimeter, check power and ground at the A/C control module connector

Signal parameters

  • CAN bus common‑mode idle ≈ 2.5 V (both CAN‑H and CAN‑L)
  • CAN‑H dominant peak ≈ 3.5 V, CAN‑L dominant valley ≈ 1.5 V (differential ≈ 2.0 V during dominant bits)
  • Expected termination ≈ 60 Ω measured between CAN‑H and CAN‑L at rest (two 120 Ω in parallel)
  • Message timeout behavior: expected periodic HVAC A/C messages at a defined interval (vehicle specific) — tool should show missing messages when timeout occurs
  • Bus off or excessive error counters visible with diagnostic tool when a node is failing

Diagnostic algorithm

  1. Confirm the symptom and verify U1110 is current or stored using a suitable scan tool; record any additional CAN/U‑codes from all modules
  2. Confirm whether vehicle is equipped with the A/C control unit (option code or VO list). If not equipped, U1110 may be informational — document and clear codes
  3. With ignition on, verify power and ground at the A/C control module connector (measure battery voltage at power pins and good continuity to ground)
  4. Inspect and secure connectors: unplug and inspect HVAC connector and gateway/ECU connectors for corrosion, bent pins, water intrusion. Reconnect and ensure tight fit
  5. Check fuses/relays related to HVAC module; replace if blown and recheck communications
  6. Using a multimeter or oscilloscope, measure CAN‑H and CAN‑L voltages at the A/C control connector with ignition on. Compare to expected signal parameters
  7. Measure resistance between CAN‑H and CAN‑L with key off — expected ≈ 60 Ω. If out of range, locate missing/bad termination or shorts to supply/ground
  8. Perform wiring continuity and short checks from A/C module CAN wires back to gateway or junction point; repair any damaged wiring or shorts
  9. If another module is suspected of causing bus errors, disconnect suspected node(s) and retest bus communication to isolate the failing module
  10. If wiring, power and grounds are good and node still will not communicate, consider replacing or reprogramming the A/C control module per factory procedure. After any repair, clear codes and perform functional test and road test to confirm repair

Likely causes

  • Blown fuse or missing ignition feed to A/C control unit
  • Corroded/loose connector at HVAC control module
  • Short to battery or ground on CAN wires near the A/C module
  • Faulty gateway/module upstream preventing message routing
  • Module not fitted on vehicle (vehicle not equipped) or wrong software configuration after module replacement

Fault status

⚠️ Status
A/C control module CAN timeout or NOT EQUIPPED — messages from the HVAC/A‑C control unit not received on the vehicle CAN bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U1111 U0100 U0073 U0115 U0121
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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