U1163 SCP Bus Communication Fault
The U1163 code indicates a communication failure or missing data on the SCP (Standard Corporate Protocol, J1850) bus, specifically related to the digital audio module or entertainment system (Digital Audio Tape/DAT). This protocol is a serial communication bus used by Ford Motor Company in vehicles from the 1990s and early 2000s. The code sets when a control module (typically the audio module or front control module) does not receive expected messages from the DAT module, or the received data is corrupted, out of range, or does not conform to the J1850 protocol specification.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty audio module/DAT player
- Open or short in SCP bus wiring (SCP+ and SCP- circuits)
- Missing or incorrect SCP bus termination resistance
- Poor connection at audio module connectors
- Faulty front electronic module (FEM) or generic electronic module (GEM) causing communication issues
- Electrical interference on the communication bus
- Corrupted or outdated audio module software
3. Symptoms You Will Notice
- Audio system inoperative or intermittent
- No sound from speakers
- DAT player not functioning
- Other modules may show communication faults
4. Step-by-Step Diagnosis
Scan for all codes and note any related U-codes
Inspect SCP bus wiring for damage, corrosion, or loose connections
Check SCP bus termination resistance (should be around 120 ohms)
Test audio module power and ground circuits
Verify communication between modules using a scope or scan tool
If wiring and terminations are good, suspect faulty audio module or FEM/GEM
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive as this code affects only the audio/entertainment system. However, other communication issues may arise if the fault is widespread.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Repair costs vary: a wiring fix may be $100-$300, while replacing the audio module can range from $200-$600 for parts and labor.