U1042 — SCP (J1850) Invalid or Missing Data for Traction Control

OBD2 code U1042 flags a problem with the ABS / stability control (SCP (J1850) invalid or missing data for traction control). Short, gentle driving to a shop is usually possible. Common culprits: faulty ABS module or pump motor, 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

Read the code and freeze frame Connect an OBD2 scanner, confirm U1042 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ABS / stability control for damage, corrosion, chafing or poor contact.
Subsystem check Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Subsystem check Inspect the sensor and tone ring for metal debris and damage near the hub.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U1042 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U1042 (parts and labor, USD, independent shop rates): Replace a wheel speed sensor: $120–$350; Repair sensor wiring: $80–$250; ABS module repair or replacement: $400–$1,200. Overall, fixing U1042 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 U1042 myself?

Start with a scan: confirm U1042, 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.

What is the most common cause of U1042?

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

Is it safe to drive with U1042?

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 are the symptoms of U1042?

Drivers most often notice: ABS or ESC warning light on, ABS not operating during hard braking, speedometer or cruise control issues, stability control disabled message.

What does OBD2 code U1042 mean?

What does U1042 mean?

The engine control module sets U1042 when it detects a fault in the ABS / stability control. In practical terms: SCP (J1850) invalid or missing data for traction control. The code belongs to the vehicle network group of OBD2 codes.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores U1042 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 U1042?

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

Common symptoms of U1042

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

How to diagnose U1042

Connect an OBD2 scanner, confirm U1042 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Visually inspect the wiring harness and connectors related to the ABS / stability control for damage, corrosion, chafing or poor contact.
Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Inspect the sensor and tone ring for metal debris and damage near the hub.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U1042 does not return.

How to fix U1042

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

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

How much does it cost to fix U1042?

Repair cost depends on which component actually failed. Typical scenarios for U1042 (parts and labor, USD, independent shop rates):

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

Overall, fixing U1042 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.