Code
P1105
PLYMOUTH
P — Powertrain
Open Or Shorted Condition Detected In The Baro Read Solenoid Control Circuit
AI status
Completed
Completed
100%
Causes
- Open circuit in solenoid control wire
- Short to battery voltage or short to ground in control wiring
- Failed BARO read/vacuum/solenoid valve
- Corroded, damaged or loose connector(s)
- Blown fuse or faulty relay supplying the circuit
- Poor or missing ground
Symptoms
- Check Engine Light (MIL) illuminated
- Possible rough idle, hesitation or reduced engine performance
- Degraded fuel economy
- Intermittent or persistent drivability issues related to barometric control
- Some vehicles may show no obvious drivability symptoms beyond the MIL
What to check
- Read freeze-frame and stored data with a scan tool; note operating conditions when the code set
- Visual inspection of solenoid, wiring harness and connector for damage, corrosion or loose pins
- Check related fuses and relays for continuity and proper operation
- Verify good battery voltage at the circuit fuse and proper ground(s)
- Backprobe the solenoid connector while commanding the solenoid ON/OFF with a scan tool to observe signal
Signal parameters
- Solenoid coil resistance (typical): roughly 20–120 ohms (vehicle specific — consult manual)
- Control circuit idle: expect either battery voltage (open or inactive depending on design) or no voltage until commanded
- When commanded ON: expect the PCM to switch the control line (either to ground or supply) — observe a pulsed or switched voltage between 0 and battery voltage
- No continuity between control pin and ground when not commanded (unless design grounds via PCM); no short to battery or ground
Diagnostic algorithm
- Connect an OBD-II scan tool, record freeze-frame and live data. Confirm P1105 is active and note conditions.
- Visually inspect the BARO read solenoid and harness for damage, melted insulation, pin corrosion, or poor connections. Repair any obvious damage.
- With ignition OFF, disconnect the solenoid connector. Measure solenoid coil resistance across its terminals. If open or shorted outside expected range, replace the solenoid.
- Check supply fuse and any relay feeding the solenoid circuit; replace faulty items and retest.
- With connector disconnected, check for short to battery or ground on the control wire: measure continuity from the control pin to battery positive and to ground. There should be no short to either.
- Reconnect and backprobe the control wire. Command the solenoid ON/OFF using the scan tool and observe voltage/duty. Verify the PCM commands the circuit and the voltage behavior matches vehicle design (switch to ground or supply).
- Perform a wiggle test on the harness while monitoring the control signal and DTC status to find intermittent faults.
- If wiring and solenoid test good but no correct command from PCM (no switching), confirm grounds and related inputs. If confirmed the PCM is not commanding as specified, consider PCM fault and consult factory repair information before replacement.
- After repairs, clear codes and road-test to verify the code does not return and that drivability is restored.
Likely causes
- Damaged wiring or connector to the BARO read solenoid (broken wire, corrosion, pin pushed out)
- Failed/baro read solenoid coil (open or shorted)
- Short to battery or ground in harness at a chafe point or connector
- Faulty ground or blown fuse feeding the circuit
Fault status
Status
P1105 — Open or short detected in BARO read solenoid control circuit. Indicates damaged wiring/connector, failed solenoid, or less commonly a PCM fault. MIL on.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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