U1044 — SCP (J1850) Invalid or Missing Data for Traction Motor

vehicle network

Is it safe to drive?

Drive with caution The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm U1044 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 ABS / stability control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
  5. Subsystem check Inspect the sensor and tone ring for metal debris and damage near the hub.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U1044 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U1044 (parts and labor, USD, independent shop rates): ABS module repair or replacement: $400–$1,200; Replace a wheel speed sensor: $120–$350; Repair sensor wiring: $80–$250. Overall, fixing U1044 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose U1044 myself?

Start with a scan: confirm U1044, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ABS / stability control, and verify the suspect component against live data before buying parts.

Is it safe to drive with U1044?

The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

What is the most common cause of U1044?

The most common causes are: faulty ABS module or pump motor, damaged sensor wiring or corroded connector, blown fuse or low voltage to the ABS module.

What are the symptoms of U1044?

Drivers most often notice: ABS or ESC warning light on, stability control disabled message, brake pedal pulsation changes, ABS not operating during hard braking.

How much does it cost to fix U1044?

ABS module repair or replacement — $400–$1,200; Replace a wheel speed sensor — $120–$350; Repair sensor wiring — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does U1044 mean?

U1044 is logged by the onboard diagnostics when the ABS / stability control does not behave as expected. The official definition is “SCP (J1850) Invalid or Missing Data for Traction Motor”. 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 U1044 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

Common symptoms of U1044

  • ABS or ESC warning light on
  • stability control disabled message
  • brake pedal pulsation changes
  • ABS not operating during hard braking
  • speedometer or cruise control issues

What causes U1044?

  • faulty ABS module or pump motor
  • damaged tone (reluctor) ring on the hub
  • damaged sensor wiring or corroded connector
  • blown fuse or low voltage to the ABS module

How to diagnose U1044

  1. Connect an OBD2 scanner, confirm U1044 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 ABS / stability control for damage, corrosion, chafing or poor contact.
  4. Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
  5. Inspect the sensor and tone ring for metal debris and damage near the hub.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U1044 does not return.

How to fix U1044

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

  • ABS module repair or replacement — $400–$1,200
  • Replace a wheel speed sensor — $120–$350
  • Repair sensor wiring — $80–$250

How much does it cost to fix U1044?

Repair cost depends on which component actually failed. Typical scenarios for U1044 (parts and labor, USD, independent shop rates):

  • ABS module repair or replacement: $400–$1,200
  • Replace a wheel speed sensor: $120–$350
  • Repair sensor wiring: $80–$250

Overall, fixing U1044 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with U1044?

The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

Related OBD2 codes