OBD Guide
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U2500

Controller Area Network Lack Of Acknowldgement From Engine Management

U2500 is an OBD-II diagnostic trouble code meaning: Controller Area Network Lack Of Acknowldgement From Engine Management. Common causes: can bus break or damage, engine control unit malfunction. Estimated repair cost: $17–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–167 (est.)

Symptoms

  • Incorrect engine operation
  • The Check Engine light comes on
  • Lost connection with other systems
  • Diagnostic problems
  • Reduced engine power

Causes

  • CAN bus break or damage
  • Engine control unit malfunction
  • Problems with ECU power supply
  • Short circuit in CAN circuit
  • Software error in the ECU

How to Fix

  1. Check the integrity of the CAN bus
  2. Check power and ground of engine ECU
  3. Scan all systems for other errors
  4. Check connections of ECU connectors
  5. Update or reflash the ECU software

Related codes

U0100U0121U0140

FAQ

What does the U2500 code mean?

U2500 is an OBD-II diagnostic trouble code that indicates: Controller Area Network Lack Of Acknowldgement From Engine Management

What causes a U2500 error code?

The most common causes of U2500 include: CAN bus break or damage; Engine control unit malfunction; Problems with ECU power supply; Short circuit in CAN circuit.

How do I fix a U2500 diagnostic trouble code?

To fix U2500: Check the integrity of the CAN bus. Check power and ground of engine ECU. Scan all systems for other errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2500?

Limited driving only, diagnose soon

How much does it cost to fix U2500?

The estimated repair cost for U2500 is $17–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat