Lost Communication with Seat Control Module A
The U0208 code indicates that the vehicle's main control module (typically the PCM, BCM, or network gateway) has lost communication with the Seat Control Module A (SCM-A) over the vehicle's data bus, usually the CAN (Controller Area Network). This module manages functions such as power seat adjustment, memory positions, seat heating/ventilation, and in some cases, massage functions. The loss of communication may be intermittent or permanent, and the module may become completely inoperative or have limited functions until communication is restored.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty seat control module A (internal damage)
- Open or short in the CAN bus wiring (high or low) to the seat module
- Corroded, loose, or disconnected connector at the seat module
- Power supply issue (blown fuse, bad relay, poor ground) to the seat module
- Faulty gateway or central communications module
- Electromagnetic interference or harness damage due to seat movement wear
3. Symptoms You Will Notice
- Seat power adjustments not working
- Seat memory, heating, ventilation, or massage functions inoperative
- Check Engine Light or other warning lights illuminated
- Intermittent seat function operation
4. Step-by-Step Diagnosis
Scan for related codes and check communication with SCM-A using a professional scan tool
Inspect the seat module connector for corrosion, damage, or loose pins
Check CAN bus wiring for opens, shorts, or high resistance between the module and the gateway
Verify power and ground circuits to the seat module (fuses, relays, wiring)
Test the CAN bus termination resistance at the module (should be ~60 ohms with other modules connected)
If all else is good, suspect a failed seat control module and replace/ reprogram as needed
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but you may lose seat adjustment and comfort features. The vehicle's core drivetrain and safety systems are not affected.
How much does it cost to fix?▼
Diagnosis typically costs $100-$200. Repair costs vary: a new seat control module can range from $200 to $600 plus labor, while wiring repairs may be $100-$300.