U1220: SCP (J1850) Invalid or Missing Data for Interior Lamp Outage
MediumNetwork/CommunicationNetwork Communication
What does U1220 mean?
U1220 is a diagnostic trouble code indicating "SCP (J1850) Invalid or Missing Data for Interior Lamp Outage". 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
- Possible issues with network communication operation
- Vehicle may enter reduced power mode (limp mode)
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $600 AUD
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 sits in the exterior lighting. Nothing about how the car drives changes, but how easily other road users see you does, and a light out is an on-the-spot fine and an inspection failure. Worth sorting before you next drive at night.
Get a diagnosis for YOUR car
Code U1220 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.