What Does P1683 Mean?
The cruise control (speed control) power relay or 12-volt driver circuit has a detected fault. This prevents proper power supply to the cruise control system components.
Common Causes
35%
Failed cruise control power relay with burned or stuck contacts
25%
Corroded or loose relay socket connections in fuse/relay box
20%
Damaged wiring between relay and cruise control module or actuator
15%
Failed ECM internal relay driver circuit (short or open)
5%
Blown fuse in cruise control power circuit
Diagnostic Steps
1
Step 1: Locate cruise control relay in fuse/relay box and check relevant fuses
2
Step 2: Test relay by swapping with identical relay or bench-test with 12V supply and listen for click
3
Step 3: Check for battery voltage at relay power input terminal and ground at relay ground terminal
4
Step 4: Test relay control signal from ECM with voltmeter (should show switching voltage when cruise activated)
5
Step 5: Verify voltage output from relay to cruise control module/actuator when energized
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The cruise control (speed control) power relay or 12-volt driver circuit has a detected fault. This prevents proper power supply to the cruise control system components.
The most common cause of P1683 (Speed Control Power Relay Or Speed Control 12 Volt Driver Circuit) is: Failed cruise control power relay with burned or stuck contacts
Typical repair costs for P1683 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cruise control will not function but vehicle operates normally otherwise. No safety impact on basic vehicle operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1683 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control System
Difficulty
Type
Manufacturer
Recommended Tools
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