SCP (J1850) Invalid or Missing Data for Cellular Phone / Paging System
Your vehicle's computer can't receive or understand data from the cellular/paging system module—like a phone that won't connect to the network. This is a communication error between the body control module and the telematics/cellular system.
The body control module monitors incoming SCP (J1850) bus messages from the cellular/paging module at regular intervals. It checks for valid data packets with correct checksums and timing. If messages are missing, corrupted, or fail integrity checks for a set duration, the fault is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| SCP Message Reception Rate | Valid messages received every 100-500 ms | No valid message for >1-2 seconds |
| Data Checksum Validation | Checksum matches expected value | Checksum mismatch or corrupted payload |
Code U1170 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, U1170 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.