U1108 — SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter)

U1108 — SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter). A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.

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 U1108 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 U1108 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U1108 (parts and labor, USD, independent shop rates): Replace a wheel speed sensor: $120–$350; ABS module repair or replacement: $400–$1,200; Repair sensor wiring: $80–$250. Overall, fixing U1108 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

Will U1108 clear itself?

Sometimes U1108 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 is the most common cause of U1108?

The most common causes are: failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.

Is it safe to drive with U1108?

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 does OBD2 code U1108 mean?

U1108 — SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter). A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.

How much does it cost to fix U1108?

Replace a wheel speed sensor — $120–$350; ABS module repair or replacement — $400–$1,200; 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 U1108 mean?

When U1108 appears on a scan, it means the control module has flagged a problem in the ABS / stability control: SCP (J1850) invalid or missing data for electric traction drive (Inverter). The fault sits in the vehicle network group of the OBD2 standard.

To set U1108, the control module compares live readings of the ABS / stability control 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.

What causes U1108?

  • damaged tone (reluctor) ring on the hub
  • damaged sensor wiring or corroded connector
  • faulty ABS module or pump motor
  • failed wheel speed sensor

Common symptoms of U1108

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

How to diagnose U1108

  1. Connect an OBD2 scanner, confirm U1108 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 U1108 does not return.

How to fix U1108

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

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

How much does it cost to fix U1108?

Repair cost depends on which component actually failed. Typical scenarios for U1108 (parts and labor, USD, independent shop rates):

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

Overall, fixing U1108 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 U1108?

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