U0027

Low Speed CAN Communication Bus (-) shorted to Bus (+)

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–56 (est.)

Symptoms

Unstable operation of the vehicle's electronic systems
Malfunction indicator light comes on
Lost connection with some modules
Inability to diagnose via OBD-II connector

Causes

Damage to the CAN bus wiring harness
Short circuit in one of the modules
Corrosion of contacts in connectors
Mechanical damage to wiring
Incorrect connection of additional equipment

How to Fix

Visual inspection of the CAN bus wiring harness
Checking the integrity of wires using a multimeter
Disabling modules one by one to identify the faulty one
Replacing damaged wires or connectors
Checking that additional equipment is connected correctly

Related codes

U0028 U0029 U0030