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P1562

Cruise Vacuum Solenoid.

  • Chevrolet
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
5
AreaVehicle speed, idle control and auxiliary inputs
62
FaultThe specific fault in that area

What it means

On a Chevrolet, P1562 relates to the cruise control vacuum solenoid circuit. The control unit monitors the solenoid and its wiring, and sets the code when the electrical readings do not match what it expects, such as an open circuit, a short or a faulty solenoid. The exact test conditions vary by model and year, so confirm against the specific vehicle's service information.

Symptoms

  • Cruise control will not engage or drops out unexpectedly
  • Cruise control behaves erratically or surges
  • Cruise control warning or service light may show, depending on model
  • Fault code stored with the engine management light on in some cases
  • Brake lamp or brake switch related faults alongside cruise problems

Possible causes

  • Faulty cruise vacuum solenoid (open or shorted coil)likely
  • Damaged, chafed or corroded wiring to the solenoidlikely
  • Loose, corroded or damaged connector at the solenoid or control unitlikely
  • Split, disconnected or leaking vacuum hose or cruise servo/actuatorpossible
  • Faulty brake or clutch release switch affecting the cruise circuitpossible
  • Fault within the control unit driver circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, then note any other cruise, brake switch or power supply codes
  2. Check the fuse feeding the cruise control circuit
  3. Visually inspect the solenoid wiring and connector for chafing, heat damage, corrosion or pushed-back pins
  4. Inspect the vacuum hoses and actuator for splits, disconnections and leaks
  5. Measure the solenoid coil resistance and compare it with the manufacturer's specification for that model
  6. Check for supply voltage and ground at the solenoid connector with the circuit active, following the wiring diagram
  7. Test the wiring between solenoid and control unit for open circuits, shorts to ground and shorts to voltage
  8. Check the brake and clutch switch operation and their signals to the control unit

How to fix

  • Replace the cruise vacuum solenoid if its resistance or operation is out of specification
  • Repair or replace damaged wiring and renew any corroded or damaged connector terminals
  • Replace split or leaking vacuum hoses or a faulty cruise actuator
  • Replace a faulty brake or clutch switch
  • Replace or repair the control unit only after all wiring and component faults have been ruled out and the fault is confirmed

Can I keep driving?

Low severity

The car is normally safe to drive, though cruise control may not work. Book it in for repair at a convenient time, and have it checked sooner if brake light or other warnings appear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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