OBD Guide
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U1017

Lost Communication With Engine Control Module

U1017 is an OBD-II diagnostic trouble code meaning: Lost Communication With Engine Control Module. Common causes: open or short circuit in the can bus, ecm power problems. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Loss of engine power
  • Inability to read other fault codes
  • Unstable engine operation
  • Disabling ECM-dependent systems

Causes

  • Open or short circuit in the CAN bus
  • ECM power problems
  • Malfunction of the engine control unit itself
  • Corroded or damaged connectors
  • ECM ground problems

How to Fix

  1. Check ECM related fuses
  2. Inspect the ECM connectors and wiring harnesses for damage.
  3. Check ECM supply voltage and ground
  4. Scan the CAN bus for communication errors
  5. Replace ECM if necessary

Related codes

U1000U1016U1018

FAQ

What does the U1017 code mean?

U1017 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Engine Control Module

What causes a U1017 error code?

The most common causes of U1017 include: Open or short circuit in the CAN bus; ECM power problems; Malfunction of the engine control unit itself; Corroded or damaged connectors.

How do I fix a U1017 diagnostic trouble code?

To fix U1017: Check ECM related fuses. Inspect the ECM connectors and wiring harnesses for damage.. Check ECM supply voltage and ground. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1017?

Do not drive — repair immediately

How much does it cost to fix U1017?

The estimated repair cost for U1017 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat