SCP Network Communication Failure
The U1160 code indicates a loss of communication on the SCP (Standard Corporate Protocol) network, which uses the SAE J1850 standard. This fault is triggered when a control module on the network fails to receive valid data or any data from the Primary ID, typically the powertrain control module (PCM) or a designated master module. Technically, this means there is a disruption in data exchange between electronic modules, preventing subordinate modules from operating synchronously and potentially affecting critical systems that rely on network communication.
1. Commonly Affected Makes
2. Most Common Causes
- Open or short circuit in the SCP (J1850) communication bus
- Damaged or missing 120-ohm terminating resistors on the SCP network
- Faulty or unpowered master control module (PCM)
- Corroded, bent, or loose electrical connections at the OBD-II connector or module connectors
- Electromagnetic interference (EMI) affecting communication wiring
- Damaged secondary control module on the SCP network causing data collision
3. Symptoms You Will Notice
- Check Engine Light or other warning lights illuminated
- Multiple system malfunctions (e.g., transmission, ABS, or instrument cluster issues)
4. Step-by-Step Diagnosis
Scan for all stored codes and note any related U-codes
Inspect the SCP network wiring for opens, shorts, or damage
Check the terminating resistors (120 ohms each) at the ends of the SCP bus
Verify power and ground at the PCM and other modules
Test for electromagnetic interference sources near communication wiring
Perform a network integrity test to isolate the faulty module
5. Frequently Asked Questions
Is it safe to drive?▼
No, this is a high-severity fault. Driving may cause unpredictable behavior in critical systems like the transmission or engine, leading to a breakdown or safety hazard.
How much does it cost to fix?▼
Repair costs vary widely depending on the cause. Simple wiring repairs may cost $100-$300, while replacing a PCM or other module can range from $500 to $1,500 or more.