U0036

Vehicle Communication Bus A (-) shorted to Bus A (+)

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Various vehicle systems do not work or work incorrectly
Check Engine light comes on
Problems starting the engine
Lost connection with diagnostic equipment

Causes

Damage to the CAN bus wiring harness
Short circuit in one of the ECUs
Corrosion or oxidation of contacts
Mechanical damage to wiring

How to Fix

Visual inspection of the CAN bus wiring harness for damage
Checking the resistance between lines CAN-A+ and CAN-A-
Turning off the ECU one by one to find the faulty module
Repair or replacement of damaged wires
Cleaning contacts from corrosion

Related codes

U0037 U0038 U0040