SCP Communication Bus Fault Code U1260
Code U1260 indicates a fault in the positive (+) single-wire SCP (Standard Corporate Protocol) circuit, based on the SAE J1850 standard. This protocol was widely used by Ford for internal communication between control modules (PCM, BCM, cluster, etc.) and the diagnostic link connector (DLC). The code sets when the main control module detects an open, short, or electrical anomaly on the positive communication line of the SCP network, preventing proper serial data transmission. Loss of signal on this line isolates modules, causing communication failures that can affect multiple vehicle subsystems.
1. Commonly Affected Makes
2. Most Common Causes
- Short to ground or voltage on the SCP (+) bus circuit of the J1850 network
- Open circuit in the positive communication bus wiring
- Damaged or out-of-spec SCP bus termination resistor
- DLC (OBD-II port) with bent, corroded, or poorly connected pins
- Faulty electronic control module that is collapsing the communication network
- Moisture or corrosion damage at communication harness splices
3. Symptoms You Will Notice
- Multiple warning lights illuminated (Check Engine, ABS, Airbag, etc.)
- Communication loss with scan tool or inability to communicate with certain modules
- Erratic or non-functional gauges, lights, or accessories
- Vehicle may not start or run poorly due to lack of module coordination
4. Step-by-Step Diagnosis
Connect a professional scan tool and verify U1260 is present along with any related communication codes.
Inspect the DLC for bent, corroded, or damaged pins, especially pin 2 (J1850+).
Check the SCP bus wiring for opens, shorts to ground or power, using a multimeter.
Measure the resistance across the SCP bus termination resistors (typically 120 ohms each, total 60 ohms).
Isolate modules by disconnecting them one at a time to identify which module is pulling the bus down.
Repair any wiring issues or replace the faulty module as needed.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not recommended. This fault can cause unpredictable behavior in critical systems like the engine, transmission, and brakes, potentially leading to a breakdown or safety hazard.
How much does it cost to fix?▼
The cost varies widely depending on the root cause. Simple wiring repairs may cost $100-$300, while replacing a faulty module can range from $400 to $1,200 or more, including labor.