P127E DODGE – Fuel Pump Control Circuit 2 Open

Meaning of Code P127E

Code P127E on Dodge vehicles indicates a malfunction in the fuel pump control circuit. The Powertrain Control Module (PCM) detects that the control signal does not match the manufacturer’s specifications.

Possible Symptoms

• ⚠️ Check engine light on (or “Service Engine Soon”)

• 🚗 Starting problems

• ⚡ Irregular idle speed

• ⛽ Loss of power or hesitation during acceleration

Possible Causes

1. Faulty fuel pump (electrical control failure)

2. Wiring issue:

   • Short circuit or open circuit in the control harness

   • Damaged or corroded connectors

3. Poor electrical connection at:

   • The fuel pump

   • The relay or PCM

4. PCM failure (less common)

Diagnostic and Repair Procedure

Step 1: Visual Inspection

• 🔍 Check the fuel pump wiring harness and connectors

• 🔌 Inspect the condition of the pins (broken, bent, oxidized)

• 🧹 Clean the contacts with electrical contact cleaner spray

Step 2: Electrical Testing

• 🔋 Check the fuel pump supply voltage (12V during startup)

• 📏 Measure the pump resistance (compare to manufacturer values)

• ⚡ Test wire integrity (no short or open circuit)

Step 3: Advanced Diagnostics

• 💻 Use an OBD-II scanner to:

  • Read live pump data

  • Check for related codes

• 🔄 Try resetting the PCM after repair

Step 4: Replacing Faulty Parts

• 🔧 Replace the fuel pump if faulty

• 🔌 Change damaged wiring or connectors

• 🛠️ Have the PCM reprogrammed if necessary (rare cases)

Conclusion

Code P127E on Dodge typically indicates an electrical issue in the fuel pump control circuit. While sometimes easy to fix (poor connection), it may require pump replacement in more serious cases.

🔧 Professional tip: If you’re not comfortable with electrical diagnostics, consult a qualified mechanic.

🚗 Is your Dodge showing this code? Share your experience in the comments to help other owners!