Cruise Control Related Malfunction
Your cruise control system isn't communicating properly with the engine computer, like a radio losing its signal. The ECU detected an internal fault in the cruise control circuit or its related sensors.
The ECU monitors cruise control switch signals, throttle actuator feedback, and brake pedal input to maintain set speed. It checks for circuit continuity, voltage levels, and signal integrity from the cruise control module.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Cruise Control Switch Signal Voltage | 0-5V (varying by switch state) | Open circuit, short to ground, or invalid signal pattern |
| Throttle Actuator Response Time | 200-500ms response to command | No response or delayed response exceeding threshold |
Code P0600 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0600 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.