U1341 — SCP (J1850) Invalid or Missing Data for Function Read Vehicle Speed

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 U1341 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 U1341 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U1341 (parts and labor, USD, independent shop rates): Replace the faulty control module: $300–$1,500; Repair CAN wiring or connectors: $100–$400; Remove interfering aftermarket device: $0–$150. Overall, fixing U1341 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 U1341 clear itself?

Sometimes U1341 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 U1341 mean?

SCP (J1850) Invalid or Missing Data for Function Read Vehicle Speed (U1341): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by water ingress in harness junctions, aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground.

How much does it cost to fix U1341?

Replace the faulty control module — $300–$1,500; Repair CAN wiring or connectors — $100–$400; 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.

Is it safe to drive with U1341?

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 is the most common cause of U1341?

The most common causes are: water ingress in harness junctions, aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground.

What does U1341 mean?

The engine control module sets U1341 when it detects a fault in the vehicle network (CAN bus) communication. In practical terms: SCP (J1850) invalid or missing data for function read vehicle speed. The code belongs to the vehicle network group of OBD2 codes.

To set U1341, 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 U1341

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

What causes U1341?

  • poor grounds or low battery voltage
  • aftermarket equipment interfering with the bus
  • water ingress in harness junctions
  • corroded connectors, especially in wet areas
  • a faulty module pulling the bus down

How to diagnose U1341

  1. Connect an OBD2 scanner, confirm U1341 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 U1341 does not return.

How to fix U1341

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

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

How much does it cost to fix U1341?

Repair cost depends on which component actually failed. Typical scenarios for U1341 (parts and labor, USD, independent shop rates):

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

Overall, fixing U1341 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 U1341?

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