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P1105

Open Or Shorted Condition Detected In The Baro Read Solenoid Control Circuit.

  • Plymouth
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
1
AreaFuel and air metering
05
FaultThe specific fault in that area

What it means

P1105 on a Plymouth means the engine control unit has detected an open or short circuit in the control circuit for the barometric (baro) read solenoid. This solenoid lets the MAP sensor take a barometric pressure reading at certain times, such as key-on or under particular throttle conditions. The code sets when the voltage or current on the solenoid control circuit does not match what the control unit commanded.

Symptoms

  • Check engine light on
  • Poor fuel economy
  • Rough running or hesitation, especially at altitude or when driving conditions change
  • Poor idle quality
  • Occasional rich or lean running because the barometric correction is wrong

Possible causes

  • Damaged, chafed or corroded wiring to the baro read solenoid (open circuit or short to ground or voltage)likely
  • Loose, corroded or damaged connector at the solenoid or the engine control unitlikely
  • Failed baro read solenoid with an internal open or shorted coillikely
  • Blocked, split or disconnected vacuum hoses around the solenoid and MAP sensorpossible
  • Fault in the power or ground supply to the solenoid circuitpossible
  • Internal driver fault in the engine control unitrare

How to diagnose

  1. Read the stored codes and freeze frame data, note any other MAP, vacuum or sensor supply codes, then clear the code and see if it returns.
  2. Check the vehicle's service information to confirm whether this engine uses a separate baro read solenoid and where it is fitted, as this varies by model and engine.
  3. Visually inspect the solenoid, its connector, the wiring harness and the vacuum hoses for damage, chafing, heat damage, corrosion or loose fit.
  4. Check the vacuum hoses to the solenoid and MAP sensor for splits, blockages or incorrect routing.
  5. Measure the solenoid coil resistance and compare it with the specification in the service information.
  6. Check the solenoid circuit for power, ground and a switching signal from the control unit with a multimeter or scope, as the wiring diagram specifies.
  7. Test the wiring for continuity and for shorts to ground or voltage between the solenoid connector and the control unit.
  8. If the wiring and solenoid are good, check the control unit connector and grounds before suspecting the control unit itself.

How to fix

  • Repair or replace damaged wiring and fix any short or open circuit found.
  • Clean or replace corroded or damaged connectors and terminals.
  • Replace the baro read solenoid if its resistance or operation is out of specification.
  • Replace split, blocked or incorrectly routed vacuum hoses.
  • Restore faulty power or ground supplies to the circuit.
  • Repair or replace the engine control unit only after all other causes are ruled out and the fault is confirmed.

Can I keep driving?

Low severity

The car can usually be driven while you book it in, as this is not normally a safety issue. Poor economy or hesitation may persist, so get it checked soon.

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

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