SCP (J1850) Invalid or Missing Data for Engine Air Intake
Your engine's computer isn't receiving proper air intake data from the SCP bus communication network, like a radio losing its signal. This prevents the engine from adjusting fuel and ignition timing correctly based on how much air is entering.
The ECU monitors SCP (J1850 bus) messages containing mass airflow (MAF) or manifold absolute pressure (MAP) sensor data. If these messages are missing, delayed, or corrupted on the network bus for a set duration, the fault is triggered. The ECU expects valid air intake signals within specific timing windows.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| SCP Message Valid Time | Received within 100-200ms intervals | No valid message for >500ms or repeated data corruption |
| Air Intake Data Range | MAF 0-7g/s or MAP 10-100 kPa | Data missing or outside expected operational range |
Code U1010 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, U1010 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.