Code
P1243
PLYMOUTH
P — Powertrain
Open Or Shorted Condition Detected In The Turbocharger Surge Valve Solenoid Control
Views:
UK: 31
EN: 37
RU: 20
AI status
Completed
Completed
100%
Causes
- Broken, corroded or disconnected wiring/connectors to the surge valve solenoid
- Faulty turbocharger surge/diverter valve solenoid (open coil or shorted)
- Blown fuse or failed relay supplying the solenoid circuit
- Poor ground at the solenoid or at the ECM
- ECM driver transistor fault
- Corroded connector pins, water intrusion, or mechanical damage near turbo plumbing
Symptoms
- Malfunction Indicator Lamp (MIL) / check engine light illuminated
- Reduced engine power or limp-home mode
- Erratic or reduced turbo boost pressure
- Poor throttle response or hesitation on acceleration
- Unusual hissing or boost leak noises if valve stuck open
What to check
- Read and record freeze-frame and all stored codes; verify P1243 is current or historic
- Visual inspection of solenoid, connector, and wiring harness for damage, corrosion or heat exposure
- Check fuses and relays related to turbo control circuit
- Backprobe solenoid connector and check for key-on power and proper ground control while commanding solenoid with a scan tool
- Measure solenoid coil resistance with connector unplugged
- Perform continuity checks from solenoid terminals to the ECM connector pins
Signal parameters
- Typical solenoid coil resistance (cold): approximately 6–30 ohms (vehicle-specific—consult service manual)
- Key‑ON (engine OFF) supply voltage at solenoid power pin: ~12 V (battery voltage)
- Control side typically switched by ECM (ground side switching) using PWM; commanded duty cycle range 0–100%
- Command frequency commonly tens to hundreds of Hz during operation (varies by vehicle)
- No voltage (open) or near 0 ohms to ground (short) measured between power and ground at connector indicates fault
Diagnostic algorithm
- Verify code and related codes. Note freeze frame data and whether code is current or intermittent.
- Perform a careful visual inspection of the turbo solenoid, vacuum/boost hoses, connector and wiring for damage, heat or contamination. Repair any visible faults.
- Check fuse(s) and relay(s) supplying the solenoid circuit; replace if blown or faulty.
- With ignition ON (engine off) backprobe the solenoid connector: verify battery voltage on the power feed and confirm the other terminal is switched by the ECM (may be ground or switched positive on some systems).
- Unplug connector and measure solenoid coil resistance with a multimeter; compare to typical range. Infinite/very high resistance = open coil; near 0 ohms = shorted coil.
- Bench‑test the solenoid: apply 12 V to the power terminal and ground the control terminal (or vice versa as appropriate) briefly to confirm operation and listen/feel for actuation. Do not apply continuously longer than specified.
- If the solenoid tests good, backprobe and command the solenoid with a scan tool while observing voltage/pulse. If the ECM does not produce a command pulse, check continuity from the ECM pin to the connector.
- Perform continuity checks: solenoid power to fuse/relay, solenoid control to ECM driver pin, and good ground paths. Repair wiring harness faults, replace connectors or pins as necessary.
- After repairs, clear codes and perform a test drive or functional test to confirm the issue is resolved and the code does not return.
- If wiring and solenoid are good but no proper control signal is present, consider ECM driver fault and consult factory diagnostics before ECM replacement.
Likely causes
- Damaged harness or connector (chewed wiring, chafing, melted insulation)
- Failed solenoid coil (open circuit or internal short)
- Bad power feed or ground connection at the solenoid
- Intermittent failure due to heat or contamination around the turbo
- ECM output stage failed (less common)
Fault status
Status
P1243 — Open or short detected in turbocharger surge (diverter) valve solenoid control circuit. The ECM has detected an abnormal electrical condition (open, short to ground or short to power) on the solenoid control wiring. Inspect wiring, connector, fuse, solenoid and ECM driver circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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