P1564 Code: Vehicle-Specific Meaning, Diagnosis, and Repair
P1564 is a manufacturer-specific diagnostic trouble code, so the same number does not mean the same fault on every vehicle. Match the stored P1564 code to make, model, year, engine, reporting module, and the manufacturer's description. Some Nissan and Infiniti applications relate it to the automatic speed control device steering switch; other makes may define it differently. A stored code marks a monitored condition, not a confirmed failed part.
Verify What P1564 Means for Your Vehicle
Because P1564 is manufacturer-specific, the first diagnostic step is identification, not parts replacement. Confirm the vehicle's make, model, year, engine, the module that reported the code, and the applicable service information. On applicable Nissan and Infiniti vehicles, P1564 may be defined as an ASCD steering switch fault. ASCD means automatic speed control device, the cruise control system that uses steering-wheel switches. That definition applies only after you confirm it for that vehicle; it is not a universal meaning of the P1564 code.
For Volkswagen, Audi, and other manufacturers that store P1564, use that maker's exact fault description and any accompanying manufacturer fault number. Do not import the Nissan or Infiniti ASCD steering switch meaning, and do not assume a problem with the cruise control buttons simply because another brand uses the same number. A stored P1564 code identifies a condition the control module monitored; it does not prove which switch, connector, or module has failed. Vehicle-specific confirmation is required before any repair decision.
Symptoms to Record Before Diagnosis
When the confirmed definition is an ASCD steering switch fault, drivers may notice cruise control that will not engage, drops out, or cruise control buttons that respond only some of the time. Those observations support diagnosis only after the vehicle-specific meaning is verified. Warning lamps and other displayed messages depend on how that vehicle defines P1564, and the code can be stored with no obvious change in driving behavior. Record what you actually see rather than assuming a cruise control complaint must be present.
Note when the concern appears, which controls are affected, and whether it started after recent electrical work or steering wheel service. That history can point a technician toward the switch circuit, wiring and connectors, or an unrelated system named by a different P1564 definition. Abnormal braking, steering, or engine operation still needs prompt assessment on its own merits. Those symptoms should not be blamed on P1564 merely because the code is stored; they may involve other faults that require separate evaluation.
Possible Causes After the Definition Is Confirmed
If the confirmed definition is an ASCD switch fault, a defective switch, a poor connection, or damaged wiring are possibilities that still require testing. The relevant switch circuit's power, ground, or reference signals may need evaluation using the manufacturer's diagnostic procedure, not guesswork. None of those items should be ranked by assumed frequency, and a switch, steering wheel electrical connection, or control module is not a confirmed failure just because P1564 is present. Testing decides what, if anything, needs repair.
When a different P1564 definition is verified, limit possible causes to the component or system that definition names. A Volkswagen or Audi description, for example, may involve an entirely different circuit than an Infiniti automatic speed control device switch. Mixing brand meanings produces the wrong tests and the wrong parts. Follow the applicable service information for that vehicle's reporting module, and treat every listed possibility as something to confirm or rule out rather than as a default replacement.
Safe Checks You Can Make While Parked
With the vehicle parked, save the complete scan report, including code status and any freeze-frame data, before clearing codes or disconnecting the battery. Freeze-frame data captures operating conditions when the P1564 code set and can be lost if memory is reset. Record related codes and the scanner's exact wording. Generic scanner text for a manufacturer-specific diagnostic trouble code often needs confirmation against factory information, because a brief label may not match the true definition.
Limit owner observations to what you can see with the vehicle safely parked: damaged cruise control buttons, sticking controls, and recent maintenance that involved the steering wheel or related electrical work. Do not remove the steering wheel, handle airbag-area connectors, probe the switch circuit, run jumper tests, or try to bypass cruise control safeguards. Those actions can create new faults or disable safety functions. Document the findings for a technician rather than attempting circuit work at home.
Professional Testing and Repairs That Follow the Evidence
A technician starts from the confirmed definition, related codes, wiring information, and the manufacturer's diagnostic procedures to isolate the fault. For a verified ASCD steering switch issue, that work typically includes evaluating switch inputs and circuit integrity with the correct tools and service information, without invasive owner-level tests. Related codes can show whether the concern is isolated to the automatic speed control device or shared with another system. The goal is to follow the evidence rather than replace parts in a fixed order.
Repairs remain conditional: a connection may be corrected, damaged wiring repaired, or a component replaced only after testing supports that step. Access to steering-column wiring and connectors, or to a control module, varies by vehicle and should not be assumed. After the repair, verification includes checking system operation and whether P1564 returns under the manufacturer's specified conditions. Clearing the code by itself is not a fix; if the monitored condition remains, the code can store again even if the scan tool memory looks clean.
Repair Cost Factors and When to Seek Service
Cost for a P1564 code depends on diagnostic labor time, vehicle configuration, how hard the confirmed component is to reach, what actually failed, and local labor rates. Precise current prices vary because those factors change by shop and vehicle. Ask for an estimate that separates diagnosis, parts, labor, and any programming or calibration the repair actually requires. Bundled quotes can hide extra module work that may not be needed if testing points only to a switch or connector.
Do not rely on cruise control while its operation is uncertain, whether the verified fault involves the ASCD steering switch or another system. Driving suitability depends on the confirmed definition and the symptoms that accompany it, not on the code number alone. Seek prompt professional assessment for a persistent P1564, extra warning lights, or drivability concerns. If braking, steering, or vehicle control is affected, stop safely when conditions allow and arrange assistance rather than continuing to drive.