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GTECH Calibration
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P1562

Cruise Vacuum Solenoid.

  • Oldsmobile
  • 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

P1562 on an Oldsmobile relates to a fault in the cruise control vacuum solenoid circuit. The control unit monitors the solenoid driver and its circuit, and sets the code when the electrical readings do not match what it expects, such as an open circuit, short or failed solenoid. The exact test and which solenoid (vacuum or vent) is monitored can vary by model and year.

Symptoms

  • Cruise control will not engage or drops out unexpectedly
  • Cruise control surges or fails to hold speed
  • Cruise control indicator or service light may show
  • Stored fault code with the cruise function disabled
  • Engine otherwise drives normally

Possible causes

  • Faulty cruise vacuum solenoid or servo assemblylikely
  • Damaged, chafed or corroded wiring to the solenoidlikely
  • Loose, corroded or damaged connector at the solenoid or control unitlikely
  • Leaking or split vacuum hoses to the cruise servopossible
  • Faulty brake pedal or clutch release switch affecting the cruise circuitpossible
  • Open fuse or supply fault to the cruise circuitpossible
  • Fault within the control unit driver circuitrare

How to diagnose

  1. Read and record the stored codes and freeze frame data, then check for any other cruise or brake switch codes
  2. Check the relevant fuse and confirm the circuit supply against the wiring diagram for your model
  3. Visually inspect the solenoid, servo, vacuum hoses and wiring for damage, chafing, heat or rodent damage
  4. Disconnect and inspect the connectors for corrosion, bent pins and poor tension
  5. Check the vacuum hoses and servo diaphragm for leaks or splits
  6. Measure the solenoid coil resistance and compare with the specification for the model
  7. Check the wiring for continuity, short to earth and short to supply between the solenoid and control unit
  8. Clear the code and road test, then recheck whether it returns

How to fix

  • Replace the faulty cruise vacuum solenoid or servo assembly
  • Repair or replace damaged wiring and secure it clear of heat and moving parts
  • Clean or replace corroded or damaged connectors and terminals
  • Replace split, perished or leaking vacuum hoses
  • Replace a faulty brake or clutch switch if it is confirmed as the cause
  • Replace a blown fuse only after finding the cause of the overload

Can I keep driving?

Low severity

The car can normally be driven as usual, but cruise control may not work. Book it in for repair at your convenience.

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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