OBD Guide
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U1118

Lost Engine Message

U1118 is an OBD-II diagnostic trouble code meaning: Lost Engine Message. Common causes: broken or damaged can bus wires, corrosion of connectors. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check Engine light comes on
  • Unstable engine operation
  • Power Loss
  • Problems with other vehicle systems
  • Errors in other modules

Causes

  • Broken or damaged CAN bus wires
  • Corrosion of connectors
  • Engine ECU malfunction
  • Problems with module power supply
  • Software errors

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Inspect connectors for corrosion
  3. Check power supply of modules
  4. Count errors in other modules
  5. Update ECU software

Related codes

U0100U0121

FAQ

What does the U1118 code mean?

U1118 is an OBD-II diagnostic trouble code that indicates: Lost Engine Message

What causes a U1118 error code?

The most common causes of U1118 include: Broken or damaged CAN bus wires; Corrosion of connectors; Engine ECU malfunction; Problems with module power supply.

How do I fix a U1118 diagnostic trouble code?

To fix U1118: Check the integrity of the CAN bus wiring. Inspect connectors for corrosion. Check power supply of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1118?

Yes, but get it checked soon

How much does it cost to fix U1118?

The estimated repair cost for U1118 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat