U0059 — Vehicle Communication Bus D (+) High

How much does it cost to fix U0059?

Repair CAN wiring or connectors — $100–$400; Replace the faulty control module — $300–$1,500; Remove interfering aftermarket device — $0–$150. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Will U0059 clear itself?

Sometimes U0059 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What is the most common cause of U0059?

The most common causes are: water ingress in harness junctions, poor grounds or low battery voltage, corroded connectors, especially in wet areas.

What are the symptoms of U0059?

Drivers most often notice: multiple warning lights on at once, intermittent loss of functions (gauges, windows, steering assist), random, hard-to-reproduce electrical glitches, modules intermittently not communicating with the scanner.

Is it safe to drive with U0059?

Depends on what is affected. A single dead convenience module is fine to drive with; loss of communication with engine, braking or steering modules is not. If multiple critical systems drop out, do not drive.

What does U0059 mean?

Seeing U0059 on your scanner? The control unit has caught the vehicle network (CAN bus) communication operating outside its calibrated window. The formal description is “Vehicle Communication Bus D (+) High”, and the code is grouped under vehicle network faults.

To set U0059, the control module compares live readings of the vehicle network (CAN bus) communication against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

Common symptoms of U0059

• multiple warning lights on at once
• intermittent loss of functions (gauges, windows, steering assist)
• random, hard-to-reproduce electrical glitches
• modules intermittently not communicating with the scanner
• no-start or intermittent starting in some cases

What causes U0059?

• water ingress in harness junctions
• damaged CAN bus wiring or short to power/ground
• corroded connectors, especially in wet areas
• a faulty module pulling the bus down
• poor grounds or low battery voltage
• aftermarket equipment interfering with the bus

How to diagnose U0059

1. Connect an OBD2 scanner, confirm U0059 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the vehicle network (CAN bus) communication for damage, corrosion, chafing or poor contact.
4. Measure resistance between CAN-High and CAN-Low at the OBD port with power off — about 60 Ω is healthy.
5. Scan all modules: the one that does not respond is either the culprit or downstream of the break.
6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0059 does not return.

How to fix U0059

Start with the cheapest and most common causes before replacing expensive parts:

• Repair CAN wiring or connectors — $100–$400
• Replace the faulty control module — $300–$1,500
• Remove interfering aftermarket device — $0–$150

How much does it cost to fix U0059?

Repair cost depends on which component actually failed. Typical scenarios for U0059 (parts and labor, USD, independent shop rates):

• Repair CAN wiring or connectors: $100–$400
• Replace the faulty control module: $300–$1,500
• Remove interfering aftermarket device: $0–$150

Overall, fixing U0059 usually costs between $0 and $1,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with U0059?

Depends on what is affected. A single dead convenience module is fine to drive with; loss of communication with engine, braking or steering modules is not. If multiple critical systems drop out, do not drive.

Related OBD2 codes

• U0001: High Speed CAN Communication Bus
• U0002: High Speed CAN Communication Bus Performance
• U0003: High Speed CAN Communication Bus (+) Open
• U0004: High Speed CAN Communication Bus (+) Low
• U0005: High Speed CAN Communication Bus (+) High
• U0006: High Speed CAN Communication Bus (-) Open