What Does P0564 Mean?
The ECM has detected a malfunction in the cruise control multi-function input 'A' circuit. This circuit carries signals from the cruise control stalk or steering wheel buttons (typically SET/COAST/RESUME functions) to the ECM. A general circuit fault means the ECM is receiving a signal that is outside the expected voltage range or does not match any valid button state.
Common Causes
35%
Faulty cruise control switch assembly with worn contacts or internal resistor failure in the multi-function stalk
30%
Damaged or corroded wiring between the cruise control switches and ECM, often in the steering column or clock spring area
25%
Failed clock spring (spiral cable) interrupting the cruise control signal path from steering wheel to column harness
10%
ECM internal fault on the cruise control input circuit or analog-to-digital converter reading the resistive ladder
Diagnostic Steps
1
Step 1: With key on engine off, monitor the cruise control input 'A' voltage on live data. It should show a stable resting voltage (typically 0V or 5V depending on design). If the voltage is floating or unstable with no buttons pressed, there is a circuit fault.
2
Step 2: Press each cruise control button individually while monitoring the voltage. Each button position should produce a distinct, stable voltage level. Compare readings to the manufacturer's voltage specification chart.
3
Step 3: Inspect the cruise control switch connector at the base of the steering column for proper engagement, corrosion, or damage. On vehicles with steering wheel buttons, check the clock spring connector.
4
Step 4: If the switches use a resistive ladder network, measure resistance across the switch connector for each button position. Compare to manufacturer specifications. Out-of-range resistance indicates a faulty switch or wiring.
5
Step 5: Check continuity of the cruise control signal wire from the steering column connector to the ECM. If the signal passes through a clock spring, test the clock spring separately by measuring continuity while slowly rotating the steering wheel lock-to-lock.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the cruise control multi-function input 'A' circuit. This circuit carries signals from the cruise control stalk or steering wheel buttons (typically SET/COAST/RESUME functions) to the ECM. A general circuit fault means the ECM is receiving a signal that is outsi...
The most common cause of P0564 (Cruise Control Multi-Function Input "A" Circuit) is: Faulty cruise control switch assembly with worn contacts or internal resistor failure in the multi-function stalk
Typical repair costs for P0564 range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cruise control may fail to engage, disengage, or respond to driver inputs. While loss of cruise control is an inconvenience, an inability to cancel cruise control via the switches could be hazardous, though the brake pedal always serves as a backup cancel method.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0564 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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