U059A — Invalid Data Received From DC to DC Converter Control Module "B"

How much does it cost to fix U059A?

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

Is it safe to drive with U059A?

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 OBD2 code U059A mean?

U059A — Invalid Data Received From DC to DC Converter Control Module "B". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: water ingress in harness junctions, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.

Will U059A clear itself?

Sometimes U059A 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.

How do I diagnose U059A myself?

Start with a scan: confirm U059A, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the vehicle network (CAN bus) communication, and verify the suspect component against live data before buying parts.

What does U059A mean?

The engine control module sets U059A when it detects a fault in the vehicle network (CAN bus) communication. In practical terms: invalid data received from DC to DC converter control module "B". The code belongs to the vehicle network group of OBD2 codes.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with U059A — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

Common symptoms of U059A

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

What causes U059A?

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

How to diagnose U059A

1. Connect an OBD2 scanner, confirm U059A 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 U059A does not return.

How to fix U059A

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

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

How much does it cost to fix U059A?

Repair cost depends on which component actually failed. Typical scenarios for U059A (parts and labor, USD, independent shop rates):

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

Overall, fixing U059A 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 U059A?

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

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• U0503: Invalid Data Received From "Door Control Module D"
• U0504: Invalid Data Received From "Door Control Module E"
• U0505: Invalid Data Received From "Door Control Module F"