OBD Guide
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U1010

CAN Communication Bus - Signal Malfunction

U1010 is an OBD-II diagnostic trouble code meaning: CAN Communication Bus - Signal Malfunction. Common causes: broken or damaged can bus wires, short circuit in can circuit. Estimated repair cost: $6–56.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check Engine light comes on
  • Unstable engine operation
  • Gear shifting problems
  • Failure of some electronic systems
  • Dashboard malfunctions

Causes

  • Broken or damaged CAN bus wires
  • Short circuit in CAN circuit
  • Malfunction of one of the electronic control units
  • Poor contact in CAN bus connectors
  • Problems with power supply of electronic units

How to Fix

  1. Check the integrity of the CAN bus wires
  2. Check CAN bus connections and connectors
  3. Diagnose electronic control units
  4. Check the power supply of electronic units
  5. Replace damaged CAN bus components

Related codes

U1000U1011U1020

FAQ

What does the U1010 code mean?

U1010 is an OBD-II diagnostic trouble code that indicates: CAN Communication Bus - Signal Malfunction

What causes a U1010 error code?

The most common causes of U1010 include: Broken or damaged CAN bus wires; Short circuit in CAN circuit; Malfunction of one of the electronic control units; Poor contact in CAN bus connectors.

How do I fix a U1010 diagnostic trouble code?

To fix U1010: Check the integrity of the CAN bus wires. Check CAN bus connections and connectors. Diagnose electronic control units. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1010?

Do not drive — repair immediately

How much does it cost to fix U1010?

The estimated repair cost for U1010 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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