OBD Guide
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U18A5

Lost Communication With Fuel Injector Control Module On Powertrain Expansion CAN Bus

U18A5 is an OBD-II diagnostic trouble code meaning: Lost Communication With Fuel Injector Control Module On Powertrain Expansion CAN Bus. Common causes: open or short circuit in the can bus, faulty injector control module. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • Unstable engine operation
  • Power dips
  • Check Engine light comes on
  • Increased fuel consumption
  • Difficulty starting the engine

Causes

  • Open or short circuit in the CAN bus
  • Faulty injector control module
  • Module power problems
  • Contact corrosion
  • Wiring harness damage

How to Fix

  1. Check the integrity of the CAN bus
  2. Diagnose the injector control module
  3. Check the power supply and ground of the module
  4. Inspect connectors and contacts
  5. Replace damaged components

Related codes

U18A4U18A6U18A7

FAQ

What does the U18A5 code mean?

U18A5 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Fuel Injector Control Module On Powertrain Expansion CAN Bus

What causes a U18A5 error code?

The most common causes of U18A5 include: Open or short circuit in the CAN bus; Faulty injector control module; Module power problems; Contact corrosion.

How do I fix a U18A5 diagnostic trouble code?

To fix U18A5: Check the integrity of the CAN bus. Diagnose the injector control module. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U18A5?

Do not drive — repair immediately

How much does it cost to fix U18A5?

The estimated repair cost for U18A5 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat