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P1245

Intake Plenum Switchover Valve.

  • Saturn
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
2
AreaFuel and air metering (injector circuit)
45
FaultThe specific fault in that area

What it means

P1245 on a Saturn means the engine control unit has detected a fault with the intake plenum switchover valve, which changes the intake manifold or plenum configuration to suit engine speed and load. The control unit saw a mismatch between the commanded valve state and the expected electrical or operating response, or a fault in the valve circuit. The exact valve design and how the fault is detected vary by model and engine.

Symptoms

  • Check engine light on
  • Reduced power at mid or high revs
  • Flat or uneven performance when the valve should change state
  • Rough idle or hesitation in some cases
  • Slightly worse fuel economy

Possible causes

  • Faulty intake plenum switchover valve or solenoidlikely
  • Wiring damage, corrosion or poor connection at the valve connectorlikely
  • Split, disconnected or blocked vacuum hose to the valve actuator (where vacuum operated)possible
  • Stuck or seized plenum flap or linkagepossible
  • Fault in the control unit driver circuitrare
  • Blown fuse or faulty power supply to the valve circuitpossible

How to diagnose

  1. Read all stored and pending codes and note the freeze frame data, including engine speed, load and temperature.
  2. Visually inspect the valve, its connector, wiring and any vacuum hoses for damage, chafing, heat damage, splits or disconnection.
  3. Check the relevant fuse and confirm power and ground at the valve connector against the model wiring diagram.
  4. Measure the valve solenoid resistance and compare it with the specification for the engine.
  5. Command the valve on and off with a suitable scan tool and listen or feel for operation, or watch actuator movement.
  6. Where vacuum operated, check vacuum supply and that the actuator holds vacuum and moves freely.
  7. Inspect the plenum flap and linkage for sticking, carbon build-up or mechanical wear, following the model procedure.
  8. Clear the code and road test to see whether it returns.

How to fix

  • Repair or replace damaged wiring or connectors at the valve circuit.
  • Replace the intake plenum switchover valve or solenoid if it fails electrical or functional tests.
  • Replace perished, split or blocked vacuum hoses and fix any vacuum supply fault.
  • Free, clean or replace the sticking plenum flap, actuator or linkage as the model requires.
  • Replace the blown fuse after finding why it failed, and only consider the control unit once all else is ruled out.

Can I keep driving?

Low severity

The car can usually be driven, but expect reduced performance at some engine speeds. Book it in soon so the fault does not hide other problems.

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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