U0598 — Invalid Data Received From AC to DC Converter Control Module "B"

vehicle network

Is it safe to drive?

Drive with caution 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.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm U0598 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs 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.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the vehicle network (CAN bus) communication for damage, corrosion, chafing or poor contact.
Subsystem check Measure resistance between CAN-High and CAN-Low at the OBD port with power off — about 60 Ω is healthy.
Subsystem check Scan all modules: the one that does not respond is either the culprit or downstream of the break.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0598 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U0598 (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 U0598 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.

Common questions

Will U0598 clear itself?

Sometimes U0598 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 does OBD2 code U0598 mean?

Invalid Data Received From AC to DC Converter Control Module "B" (U0598): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.

How do I diagnose U0598 myself?

Start with a scan: confirm U0598, 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 is the most common cause of U0598?

The most common causes are: a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground, corroded connectors, especially in wet areas.

What are the symptoms of U0598?

Drivers most often notice: no-start or intermittent starting in some cases, modules intermittently not communicating with the scanner, multiple warning lights on at once, intermittent loss of functions (gauges, windows, steering assist).

What does U0598 mean?

U0598 is logged by the onboard diagnostics when the vehicle network (CAN bus) communication does not behave as expected. The official definition is “Invalid Data Received From AC to DC Converter Control Module "B"”. This is a vehicle network category code.

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 U0598 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes U0598?

water ingress in harness junctions
damaged CAN bus wiring or short to power/ground
aftermarket equipment interfering with the bus
corroded connectors, especially in wet areas

Common symptoms of U0598

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

How to diagnose U0598

Connect an OBD2 scanner, confirm U0598 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Visually inspect the wiring harness and connectors related to the vehicle network (CAN bus) communication for damage, corrosion, chafing or poor contact.
Measure resistance between CAN-High and CAN-Low at the OBD port with power off — about 60 Ω is healthy.
Scan all modules: the one that does not respond is either the culprit or downstream of the break.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0598 does not return.

How to fix U0598

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 U0598?

Repair cost depends on which component actually failed. Typical scenarios for U0598 (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 U0598 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 U0598?

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.