OBD Guide
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U1816

Lost Communication With Drive Motor Control Module B On Bus B

U1816 is an OBD-II diagnostic trouble code meaning: Lost Communication With Drive Motor Control Module B On Bus B. Common causes: broken or damaged can bus wires, engine control module b fault. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Gear shifting problems (if any)
  • Unstable engine operation
  • Disabling some vehicle systems

Causes

  • Broken or damaged CAN bus wires
  • Engine control module B fault
  • Module power problems
  • Corrosion or oxidation of connector contacts
  • Software error in the module

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Diagnose Engine Control Module B
  3. Check the power supply and ground of the module
  4. Clean connector contacts
  5. Update module software (if required)

Related codes

U1815U1817U1818

FAQ

What does the U1816 code mean?

U1816 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Drive Motor Control Module B On Bus B

What causes a U1816 error code?

The most common causes of U1816 include: Broken or damaged CAN bus wires; Engine control module B fault; Module power problems; Corrosion or oxidation of connector contacts.

How do I fix a U1816 diagnostic trouble code?

To fix U1816: Check the integrity of the CAN bus wiring. Diagnose Engine Control Module B. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1816?

Limited driving only, diagnose soon

How much does it cost to fix U1816?

The estimated repair cost for U1816 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat