U0017

Medium Speed CAN Communication Bus (-) High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Check Engine light comes on
Incorrect operation of the vehicle's electronic systems
Loss of communication with some control units
Switching systems into emergency mode
Problems starting the engine

Causes

Open or short circuit in CAN circuit (-)
Damage to the CAN bus wiring harness
Fault in one of the modules connected to the bus
Corrosion or poor contact in connectors
Problems with power supply to CAN modules

How to Fix

Check the integrity of the CAN bus wires
Inspect connectors and contacts for corrosion
Check the voltage and resistance in the CAN circuit
Disable the modules one by one to identify the faulty one.
Check the grounding of electronic units

Related codes

U0018 U0019 U0020