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Home / DTC / U1130 — A/C(CAN message)

U1130 — A/C(CAN message)

Detailed page for trouble code U1130.

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Code

U1130

MITSUBISHI U — Network/User

A/C(CAN message)

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

Causes

  • Open or short in CAN high/low wiring between A/C module and gateway/ECU
  • Poor connector contact or corrosion at A/C module, gateway, or junctions
  • Faulty A/C control module (internal CAN transceiver failure)
  • Failed or weak battery / low system voltage impacting CAN operation
  • Missing or damaged CAN bus termination resistor
  • Intermittent CAN bus interference from aftermarket devices

Symptoms

  • A/C system may not respond to controls or may operate intermittently
  • One or more dash indicators or HVAC displays show errors or go dark
  • Other modules that rely on A/C data (climate, engine ECU) show related messages
  • Stored U1130 with possible other CAN-related U-codes
  • Unreliable behavior of climate control settings

What to check

  • Read all stored and pending DTCs on all modules; record freeze-frame data
  • Visually inspect A/C module connectors and wiring harness for damage or corrosion
  • Check vehicle battery voltage and charging system while key on and during cranking
  • Verify fuses and power supply circuits for the A/C module
  • Use a CAN bus diagnostic tool or scope to check CAN high/low network signals and message traffic
  • Verify correct CAN bus termination (approx. 60 ohms between CAN H and L across network)

Signal parameters

  • CAN ID and message arbitration ID for A/C module
  • Message frequency/period (expected Hz or ms)
  • Payload bytes used for A/C status (expected ranges)
  • CAN high and CAN low voltage levels (idle ~2.5V, recessive ~2.5V differential)
  • Bus termination resistance (approx. 60 ohms total)
  • Supply voltage to A/C module (key ON battery voltage range)

Diagnostic algorithm

  1. Retrieve all DTCs from all modules and note freeze-frame and occurrence conditions. Clear codes and attempt to re-create with known repro steps (ignition cycling, HVAC operation).
  2. Inspect and secure connectors/pigtails at the A/C control module, gateway, fuse box, and any in-line junctions. Look for corrosion, bent pins, or moisture.
  3. Verify fuses and power/ground circuits to the A/C module. Repair any open circuits and retest.
  4. With ignition ON, measure CAN H and CAN L at the A/C module connector: check idle voltages (~2.5V) and that both wires are present. Use a scan tool or CAN bus monitor to confirm A/C module messages are present and valid.
  5. If bus voltages are abnormal, inspect wiring to the next nodes and measure resistance across CAN H/L to check for proper termination. Repair shorts/opens as found.
  6. If wiring and power are good but messages are absent or corrupted only for the A/C module, consider module internal CAN transceiver fault—verify by backprobing at module and comparing traffic seen at gateway.
  7. Check for recent software updates, incorrect module coding, or aftermarket devices on the CAN bus. Reprogram or revert coding if applicable and recommended by manufacturer.
  8. After repairs, clear codes and perform road or operation test to ensure code does not return and A/C data flows to other modules.

Likely causes

  • Loose or corroded connector at the A/C control unit
  • Broken or rubbed-through CAN wire where harness flexes
  • Blown fuse that powers the A/C module or CAN transceiver
  • Faulty A/C module CAN transceiver
  • Disconnected or damaged aftermarket device placed on the CAN bus

Fault status

⚠️ Status
A/C control module CAN message missing/invalid
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 U0140 U1128 U1131
406

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