U0447 — Invalid Data Received From Gateway "A"

U0447 — Invalid Data Received From Gateway "A". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: aftermarket equipment interfering with the bus, a faulty module pulling the bus down, water ingress in harness junctions.

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

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm U0447 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. 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.
  3. 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.
  4. Subsystem check Measure resistance between CAN-High and CAN-Low at the OBD port with power off — about 60 Ω is healthy.
  5. Subsystem check Scan all modules: the one that does not respond is either the culprit or downstream of the break.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0447 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U0447 (parts and labor, USD, independent shop rates): Remove interfering aftermarket device: $0–$150; Replace the faulty control module: $300–$1,500; Repair CAN wiring or connectors: $100–$400. Overall, fixing U0447 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 U0447 clear itself?

Sometimes U0447 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 are the symptoms of U0447?

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

What is the most common cause of U0447?

The most common causes are: aftermarket equipment interfering with the bus, a faulty module pulling the bus down, water ingress in harness junctions.

Is it safe to drive with U0447?

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 much does it cost to fix U0447?

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

What does U0447 mean?

Behind U0447 is a specific failure in the vehicle network (CAN bus) communication: invalid data received from gateway "A". The onboard computer stores it in the vehicle network group after verifying the fault over repeated checks.

To set U0447, 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 U0447

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

What causes U0447?

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

How to diagnose U0447

  1. Connect an OBD2 scanner, confirm U0447 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 U0447 does not return.

How to fix U0447

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

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

How much does it cost to fix U0447?

Repair cost depends on which component actually failed. Typical scenarios for U0447 (parts and labor, USD, independent shop rates):

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

Overall, fixing U0447 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 U0447?

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