SCP (J1850) Invalid or Missing Data for Digital Audio Tape
Your vehicle's communication network isn't receiving proper data from the digital audio system, like a radio losing its signal. The engine computer expects to hear from the audio module but gets nothing or garbled information instead.
The ECU monitors SCP (J1850) bus communication from the digital audio module. It expects valid data packets at regular intervals; if packets are missing, corrupted, or arrive outside the timing window, the fault is triggered. The system uses checksums and protocol validation to detect invalid data.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| SCP Data Validity | Valid frames received within 100-500ms intervals | Missing frames or invalid checksum for >2 consecutive cycles |
| Message Timeout | <500ms between audio module transmissions | >1000ms without valid response |
Code U1162 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, U1162 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.