P0580

Code

Generic P — Powertrain

Cruise Control Multi-Function Input A Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 48 RU: 37

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Page language: EN

Causes

Open or shorted wiring between the cruise control switch (multi‑function) and the control module
Poor or corroded connector/terminal at the switch, clock spring, or module connector
Failed cruise control multi‑function switch (steering wheel switch)
Damaged or faulty clockspring/spiral cable (loss of continuity through steering column)
Faulty body control module (BCM) / powertrain control module (PCM) input circuit or internal component

Symptoms

Cruise control inoperative or disabled
Cruise set/resume/accelerate/decelerate inputs not responding
Malfunction Indicator Lamp (MIL) or cruise warning light illuminated on instrument cluster
Intermittent cruise operation or only some cruise switch functions working

What to check

Retrieve freeze‑frame and event data from scan tool to confirm when fault was logged
Visually inspect steering‑wheel area, clock spring, and wiring for damage or loose connectors
Check for related DTCs (other cruise input circuits, BCM communication codes)
Perform wiggle test while monitoring the input with scan tool or multimeter to reproduce low condition
Measure voltage at the input pin at the module and at the switch connector with ignition ON (refer to vehicle wiring for pin locations)

Signal parameters

Expected idle/input voltage: depends on vehicle — commonly a pull‑up to ~5 V (logic) or to vehicle battery (10–14 V) when switch is open; active states change voltage according to switch design
Low condition defined as near 0–0.8 V (short to ground) or below manufacturer threshold
Resistance through switch/clock spring should be low when closed and show open/variable when operated; continuity should be stable
No high current draw on the circuit (

Diagnostic algorithm

Read and record freeze‑frame and related codes. Note whether the fault is steady or intermittent.
Attempt to reproduce the fault while monitoring the cruise input live data on a scan tool. Operate each cruise switch function and observe signal behavior.
Visually inspect steering wheel, switch, clock spring, and harness for damage, pin corrosion, or bent terminals. Repair any obvious issues.
With ignition ON, backprobe the input pin at the control module and measure voltage. Compare to expected values for open and activated switch states.
Backprobe the switch side connector at the steering wheel (or via access panel) and measure voltage. If module sees low but switch side shows normal voltage, suspect wiring/connector between them.
Perform continuity and resistance tests between the switch and module pins with battery disconnected. Check for shorts to ground and for opens. Wiggle harness and clock spring while monitoring for intermittent changes.
If wiring and connectors test good, remove/replace the steering wheel switch assembly or clock spring (replace components showing faults) and retest.
If replacement of switch and clock spring does not clear the low input and wiring is intact, suspect the BCM/PCM input circuit. Verify related module power/grounds and communication; consider module repair or replacement as last step.
After repairs, clear codes and road test to confirm the fault does not return.

Likely causes

Corroded/loose connector at steering wheel switch or module
Damaged clockspring causing intermittent/low continuity or short to ground
Wiring shorted to chassis ground between switch and module
Failed multi‑function (cruise) switch
Control module internal fault (less common)

Fault status

⚠️ Status

Cruise Control Multi‑Function Input A Circuit Low — control module detects voltage on cruise input A is below expected threshold (possible short to ground, open circuit, connector/clock spring fault, or failed switch/module).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours