U1075 — SCP (J1850) Invalid or Missing Data for Engine Oil Temp

OBD2 code U1075 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for engine oil temp). Short, gentle driving to a shop is usually possible. Common culprits: water ingress in harness junctions, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.

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 U1075 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 U1075 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U1075 (parts and labor, USD, independent shop rates): Replace the faulty control module: $300–$1,500; Remove interfering aftermarket device: $0–$150; Repair CAN wiring or connectors: $100–$400. Overall, fixing U1075 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

How much does it cost to fix U1075?

Replace the faulty control module — $300–$1,500; Remove interfering aftermarket device — $0–$150; 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 OBD2 code U1075 mean?

OBD2 code U1075 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid or missing data for engine oil temp). Short, gentle driving to a shop is usually possible. Common culprits: water ingress in harness junctions, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.

Is it safe to drive with U1075?

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 do I diagnose U1075 myself?

Start with a scan: confirm U1075, 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 U1075?

The most common causes are: water ingress in harness junctions, damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down.

What does U1075 mean?

U1075 is logged by the onboard diagnostics when the vehicle network (CAN bus) communication does not behave as expected. The official definition is “SCP (J1850) Invalid or Missing Data for Engine Oil Temp”. This is a vehicle network category code.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores U1075 and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

What causes U1075?

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

Common symptoms of U1075

  • 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

How to diagnose U1075

  1. Connect an OBD2 scanner, confirm U1075 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 U1075 does not return.

How to fix U1075

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

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

How much does it cost to fix U1075?

Repair cost depends on which component actually failed. Typical scenarios for U1075 (parts and labor, USD, independent shop rates):

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

Overall, fixing U1075 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 U1075?

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