What Does P0580 Mean?
The ECM has detected that the cruise control multi-function input 'A' circuit is reading below the minimum acceptable voltage threshold. This low-input condition means the signal is being pulled toward ground when it should not be. This may prevent certain cruise functions from operating or cause the ECM to misinterpret the driver's cruise control input.
Common Causes
35%
Short to ground in the cruise control input 'A' signal wire from chafed insulation or pinched wiring
30%
Failed cruise control switch with internal short circuit pulling the resistive-ladder signal low
25%
Moisture intrusion in the cruise control connector creating a low-resistance path between signal and ground pins
10%
Lost 5V reference voltage causing the entire resistive-ladder to read low
Diagnostic Steps
1
Step 1: Measure the cruise control input 'A' voltage at the ECM with no buttons pressed. A reading near 0V when the expected rest voltage is higher confirms the low-input condition.
2
Step 2: Disconnect the cruise control switch connector. If the ECM input voltage rises to the expected rest level, the switch or its wiring has a short to ground.
3
Step 3: With the switch disconnected, measure resistance from the signal wire to ground at both ends of the harness. Any reading below 10k ohms indicates a short to ground in the wiring.
4
Step 4: If the 5V reference voltage is missing or low at the switch connector, check for a short on the reference bus. Another sensor sharing the same 5V reference may be pulling it down.
5
Step 5: Inspect the wiring harness routing for areas where it may contact sharp edges or be pinched by the steering column. Repair any shorts found and verify the cruise control input voltage returns to the expected rest state.
Estimated Repair Cost
$30 - $350
Parts + labor, varies by vehicle and location
The ECM has detected that the cruise control multi-function input 'A' circuit is reading below the minimum acceptable voltage threshold. This low-input condition means the signal is being pulled toward ground when it should not be. This may prevent certain cruise functions from operating or cause th...
The most common cause of P0580 (Cruise Control Multi-Function Input "A" Circuit Low) is: Short to ground in the cruise control input 'A' signal wire from chafed insulation or pinched wiring
Typical repair costs for P0580 range from $30 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cruise control is typically disabled by the ECM when a low-input fault is detected. This prevents unintended cruise control operation and is not a safety hazard. Normal driving is unaffected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0580 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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