Door Lock Data Communication Failure
The U1197 code indicates a communication failure on the SCP (J1850) network related to door lock data. The SCP bus is a proprietary communication protocol used primarily by Ford vehicles. This code sets when the main control module fails to receive valid data or any signal from the door control module (such as the Driver Door Module). This means there is a disruption in data flow across the bus, preventing the central system from knowing the door lock status. The signal loss can be due to a physical wiring issue on the bus or an internal failure within the door module.
1. Commonly Affected Makes
2. Most Common Causes
- Open or short circuit in the SCP (J1850) communication bus
- Damaged or faulty door control module (DDM)
- Poor connection at the door module connector
- Blown fuse supplying power to the door control module
- Faulty central control module (PCM or BCM)
3. Symptoms You Will Notice
- Door locks may not respond to remote or interior switches
- Door lock status may be incorrect or not displayed
4. Step-by-Step Diagnosis
Scan for other related codes and check freeze frame data
Inspect the SCP bus wiring for opens, shorts, or corrosion, especially at door hinge areas
Check the door module connector for bent pins or poor contact
Verify power and ground at the door module, including relevant fuses
Test communication on the SCP bus with a scope or breakout box
If wiring and power are good, suspect a faulty door module or central module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but door lock functionality may be impaired. The vehicle may not lock or unlock doors properly, which could be a security concern.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Repair costs vary: a wiring repair may be $100-$300, while replacing a door module can range from $200-$500 including labor.