Code P1389 is a specific code for Chrysler vehicles, related to the ASD (Auto Shutdown Relay) circuit. This relay is crucial for supplying power to essential engine components (injectors, ignition coil, etc.). Complete breakdown.
Meaning of Code P1389
The ASD relay provides current to critical engine elements during operation. If the Powertrain Control Module (PCM) detects an anomaly in this relay’s circuit (incorrect voltage, irregular signal), code P1389 is stored. This fault can cause the engine to shut off abruptly or prevent it from starting.
Possible Causes
- Faulty ASD Relay:
- Oxidized or stuck internal contacts.
- Electrical Issues:
- Cut wires, short circuit to ground, corroded connectors.
- Blown fuse (usually in the under-hood fuse box).
- PCM Failure (rare):
- Software error or hardware failure of the module.
Common Symptoms
- 🚨 Check Engine Light On (error message).
- 🔌 Engine Stalling while driving or failure to start.
- ⚡ No Spark or Fuel Injection (diagnosable via a scan tool).
Diagnosis and Repairs
Verification Steps
- Check the ASD Fuse:
- Locate the fuse associated with the ASD relay (consult the vehicle manual). Replace it if blown.
- Test the ASD Relay:
- Swap the ASD relay with an identical relay (e.g., headlight relay) to check its operation.
- Use a multimeter to test the relay’s resistance and continuity.
- Inspect the Electrical Circuit:
- Check the wires between the PCM, ASD relay, and battery (look for melted insulation or breaks).
- Clean oxidized connectors with contact cleaner spray.
Common Solutions
- Replace the ASD Relay:
- Moderate cost (€15 to €50). Choose a part compatible with the Chrysler model.
- Repair the Wiring:
- Repair damaged wires using heat shrink tubing.
- Reset the PCM:
- Use an OBD2 scanner to clear code P1389 after repair.
⚠️ Warning:
- Disconnect the battery before any electrical work to avoid short circuits.
When to Consult a Professional?
- If the problem persists after replacing the relay and checking the fuses.
- To diagnose a possible PCM failure (requires specialized equipment).
Affected Chrysler Models
This code is common on Chrysler vehicles equipped with 2.4L, 3.3L, or 3.8L engines (e.g., Dodge Caravan, Jeep Grand Cherokee, Chrysler 300).