TCC solenoid operation depends on signals provided by the Engine Coolant Temperature (ECT) sensor, brake switch, Throttle Position (TP) sensor, Vehicle Speed Sensor (VSS) and gear position.
The lockup is the last 'shift' feeling when you get to a steady cruising speed. It basically turns the torque converter into a regular (manual type) clutch until you make a significant change in speed or throttle position, at which point it 'unlocks' and turns back into a regular torque converter. Not locking the TC will hurt your highway gas mileage, and may cause you to fail emissions testing (if you need emissions testing).
A simple loose/corroded connection can cause the error, but unless you have had work done, drivern through high water, or something along those lines, it's not hugely likely. On the other hand, it's simple, fairly quick, and the absolute cheapest thing to check for. :)
Most likely, it's either the TCC solenoid itself, or your torque converter is going bad.
Without the exact code (number) it's hard to be more exact.
There is a large chart that includes your model located at:
http://www.troublecodes.net/suzuki/
Your model starts a little over halfway down the page.
How do I know if my problem is
my transmission or my torque converter?
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