U1156: SCP (J1850) Invalid or Missing Data for Digital Signal Processing
What does U1156 mean?
U1156 is a diagnostic trouble code indicating "SCP (J1850) Invalid or Missing Data for Digital Signal Processing". This code relates to your vehicle's network communication and should be diagnosed to determine the root cause. The severity level helps indicate how urgently this should be addressed.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
Common causes
- Faulty network communication component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
This code does not name the system it came from, so we will not tell you how urgent it is or whether the car is fine to keep driving. Do not read that as minor. Have the code read against your specific make and model, where the manufacturer-specific meaning can be looked up properly.
Get a diagnosis for YOUR car
Code U1156 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.