P0600
Cruise Control Related Malfunction
Powertrain Speed/Idle Control Cruise Control 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

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.

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Symptoms You May Notice
3 known symptoms for this code
Cruise control won't engage or maintain speed
Cruise control button unresponsive on steering wheel
Check Engine Light illuminated with no other driveability issues
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Embedded Systems Insight
What the ECU/ECM is actually computing

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.

Voltage & Parameter Thresholds

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
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Cruise Control Fuse
Check and replace the cruise control fuse in the fuse box as specified in your owner's manual.
2
Cruise Control Switch Connector
Disconnect and reconnect the cruise control switch harness on the steering wheel to reseat any loose connections.
3
Cruise Control Module/Switch Assembly
Replace the steering wheel cruise control switch or dedicated cruise module if connectors and fuses test normal.