P0564

Code

Generic P — Powertrain

Cruise Control Multi-Function Input A Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 34 EN: 42 RU: 35

AI status

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Page language: EN

Causes

Open, short to ground, or short to battery in the cruise multi-function switch circuit
Faulty cruise control multi-function switch (steering wheel control or stalk)
Poor connector contact, corrosion, or damaged wiring/harness
Blown fuse or poor ignition feed to switch/PCM input
Faulty PCM/input driver (less common)
Intermittent connection due to harness chafe, pin damage, or water intrusion

Symptoms

Cruise control inoperative or intermittent
Malfunction Indicator Lamp (MIL) may be illuminated
Stored P0564 DTC and possible related cruise codes
Switch commands not recognized (resume/set/cancel not working)
Cruise may disengage unexpectedly or fail to engage

What to check

Scan for codes and note freeze frame and freeze data
Verify battery voltage is within normal range (12.4–14.7 V) before testing
Visually inspect cruise switch, connector(s), and wiring for damage or corrosion
Check related fuses and ignition feed circuits
Backprobe the switch input at the PCM with a DMM or oscilloscope while operating switches
Perform wiggle test on harness/connectors to reproduce fault

Signal parameters

Typical input type: switched digital or pulsed signal between 0 V and vehicle battery (~0–12 V) or 0–5 V depending on vehicle design
Expected resting voltage: depends on design – commonly 0 V (ground) or pull-up to key-on voltage; consult vehicle wiring
Closed switch: near 0 Ω (continuity) between switch terminal and ground or supply depending on circuit
Open switch: infinite resistance (open circuit) between switch terminals
No excessive voltage drop on supply (should be within ~0.5 V of battery when operating)

Diagnostic algorithm

Retrieve and record all stored codes and freeze-frame data. Check for related cruise or input circuit codes.
Verify proper battery voltage and charging system operation. Low voltage can cause spurious inputs.
Visually inspect the cruise control switch, connectors, and harness for obvious damage, corrosion, or water intrusion. Repair as needed.
Identify the switch pin and the corresponding PCM input pin using vehicle wiring diagrams.
With ignition ON (engine off), backprobe the PCM input and observe voltage with switch operated. Note voltage change and compare to expected behavior (see signal_params).
If no expected signal at PCM when operating switch, backprobe at switch connector. If signal present at switch but not at PCM, check continuity of wiring between switch and PCM; repair open/shorts.
If short to battery or ground suspected, disconnect switch and measure for short to ground or battery on the circuit. Repair damaged insulation or replace harness section.
If switch shows no continuity where expected, replace the cruise multi-function switch assembly and retest.
If wiring and switch check good but PCM input remains erroneous, consider PCM input driver fault. Confirm with manufacturer-specific tests before replacing PCM.
Clear codes and perform road test to verify repair. Re-scan and confirm no return of P0564.

Likely causes

Broken wire between switch and PCM
Corroded or loose connector at switch or PCM
Failed multifunction switch assembly
Short to battery or ground caused by damaged insulation
Faulty PCM input circuit

Fault status

⚠️ Status

PCM detected invalid or intermittent signal on Cruise Control Multi-Function Input A circuit. Fault stored and MIL may be set. Freeze frame data recorded. Cruise control may be disabled until fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours