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GTECH Calibration
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P1562

Cruise Vacuum Solenoid.

  • Saturn
  • 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 Saturn, P1562 relates to the cruise control vacuum solenoid circuit. The engine control unit has detected a fault in the solenoid or its wiring, such as an open circuit, short circuit or a reading outside the expected range, so cruise control operation is affected. The exact test conditions depend on the model and year.

Symptoms

  • Cruise control will not engage or cancels unexpectedly
  • Cruise control does not hold speed steadily
  • Engine warning light on
  • Cruise control switch seems dead
  • Cruise control works only intermittently

Possible causes

  • Faulty cruise vacuum solenoid or servo assemblylikely
  • Damaged, chafed or corroded wiring to the solenoidlikely
  • Poor connection or corroded terminals at the solenoid or control unit connectorpossible
  • Split, perished or disconnected vacuum hose to the cruise servopossible
  • Faulty brake switch or cruise cancel switch affecting the cruise circuitrare
  • Fault inside the engine control unit driver circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, note any other cruise or brake switch codes, then clear and see if P1562 returns
  2. Visually inspect the solenoid, servo, vacuum hoses and wiring for damage, chafing, heat or disconnection
  3. Check the connector at the solenoid for corrosion, bent or loose pins and moisture
  4. Check the vacuum hoses and servo for leaks or splits and confirm the vacuum supply is present
  5. Measure solenoid coil resistance and compare it with the specification for that model and year
  6. Check the supply voltage and earth at the solenoid connector with the ignition on, following the wiring diagram
  7. Test the wiring between the solenoid and the control unit for open circuits, shorts to earth or shorts to voltage
  8. Check the brake and clutch switch operation and the cruise control switch inputs if the fault persists

How to fix

  • Replace the cruise vacuum solenoid or servo if its resistance or operation is out of specification
  • Repair or replace damaged wiring and secure it away from heat and sharp edges
  • Clean or replace corroded or loose connector terminals
  • Replace split or perished vacuum hoses and fix any vacuum leaks
  • Replace a faulty brake or cruise switch if testing proves it is at fault
  • Repair or replace the engine control unit only after all wiring and component checks have been proven good

Can I keep driving?

Low severity

The car is generally safe to drive, but cruise control may not work. Book it in at your convenience, and have it checked sooner if other warning lights appear or the engine runs poorly.

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

This code for other makes

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