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GTECH Calibration
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P1588

Cruise Control Clutch Control Circuit High.

  • 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
88
FaultThe specific fault in that area

What it means

P1588 on an Oldsmobile means the control module has detected a high voltage condition on the cruise control clutch control circuit. The module commands the circuit and sees a voltage higher than expected, which points to an open circuit, a short to voltage or a fault in the driver or the component it controls. The exact layout of the cruise clutch circuit depends on the model and year, so check the wiring information for the specific car.

Symptoms

  • Cruise control will not engage or drops out unexpectedly
  • Cruise control switch seems dead or behaves erratically
  • Check engine or service engine light on
  • Cruise control inoperative after setting the speed
  • Possible brake or cruise related warning on some models

Possible causes

  • Open circuit or damaged wiring in the cruise clutch control circuitlikely
  • Corroded, loose or pushed-out pins at the cruise control connector or module connectorlikely
  • Short to voltage on the control circuit wiringpossible
  • Faulty cruise control clutch or servo/actuator assemblypossible
  • Faulty brake or clutch release switch affecting the circuitpossible
  • Fault in the control module driver or internal circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, noting whether other cruise or brake switch codes are present
  2. Visually inspect the cruise control wiring, connectors and harness routing for chafing, corrosion, water ingress or previous repairs
  3. Check the fuse supplying the cruise control circuit and the condition of its terminals
  4. Check the operation and adjustment of the brake and clutch release switches
  5. Using the wiring diagram for the model, measure the voltage on the clutch control circuit with the ignition on and the cruise commanded on and off
  6. Check the circuit for continuity and for a short to voltage between the module and the cruise component
  7. Test the resistance and operation of the cruise clutch or actuator against the manufacturer specification
  8. Clear the code and road test to see if it returns, only suspecting the module after wiring and components check out

How to fix

  • Repair or replace damaged wiring and fix any open circuit or short to voltage
  • Clean, repair or replace corroded or damaged connectors and terminals
  • Replace the faulty cruise control clutch, servo or actuator if it fails testing
  • Replace or adjust a faulty brake or clutch release switch
  • Replace or repair the control module only after confirming it is at fault

Can I keep driving?

Low severity

The car is normally safe to drive as only the cruise control is affected. Book it in for repair at your convenience.

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

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