OBD Guide
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U2101

CAN Bus Maximum List Of Control Modules

U2101 is an OBD-II diagnostic trouble code meaning: CAN Bus Maximum List Of Control Modules. Common causes: damage to can bus wiring, malfunction of one of the electronic modules. Estimated repair cost: $17–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Some car systems do not work
  • Problems starting the engine
  • Dashboard malfunctions
  • Errors in other systems

Causes

  • Damage to CAN bus wiring
  • Malfunction of one of the electronic modules
  • Short circuit in the CAN bus circuit
  • Installation of non-standard equipment
  • Problems with module power supply

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Diagnose all connected modules
  3. Check the resistance on the CAN bus
  4. Remove non-standard equipment
  5. Update module software

Related codes

U0100U0121U0140

FAQ

What does the U2101 code mean?

U2101 is an OBD-II diagnostic trouble code that indicates: CAN Bus Maximum List Of Control Modules

What causes a U2101 error code?

The most common causes of U2101 include: Damage to CAN bus wiring; Malfunction of one of the electronic modules; Short circuit in the CAN bus circuit; Installation of non-standard equipment.

How do I fix a U2101 diagnostic trouble code?

To fix U2101: Check the integrity of the CAN bus wiring. Diagnose all connected modules. Check the resistance on the CAN bus. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2101?

Do not drive — repair immediately

How much does it cost to fix U2101?

The estimated repair cost for U2101 is $17–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat