C0263

CAN Signal Not Received From ECM

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–222 (est.)

Symptoms

Incorrect operation of the dashboard
Warning lamps come on
Loss of communication with other modules
Reduced efficiency of vehicle systems

Causes

Broken or damaged CAN wiring harness
ECM malfunction
Short circuit in CAN circuit
ECM power problems
Corrosion of connector contacts

How to Fix

Check the integrity of the CAN wiring harness
Diagnose ECM power supply
Check connections and connector contacts
Replace damaged components if necessary
Update ECM firmware (if required)

Related codes

U0100 U0101 U0121