P1747: EPC Solenoid Short Circuit
The P1747 code indicates a short circuit in the Electronic Pressure Control (EPC) solenoid circuit. The EPC solenoid regulates transmission line pressure based on engine load and throttle position. A short circuit can cause erratic shifting, harsh engagement, or transmission slippage. This code is often triggered by damaged wiring, a faulty solenoid, or a malfunctioning transmission control module (TCM).
01. Most Common Causes
- Short to ground or power in EPC solenoid wiring
- Faulty EPC solenoid
- Damaged connector or corroded pins
- Failed transmission control module (TCM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission slipping
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect wiring and connectors for damage, corrosion, or shorts.
Step 3: Test EPC solenoid resistance with a multimeter (typically 3-5 ohms).
Step 4: Check for power and ground at the solenoid connector.
Step 5: If wiring and solenoid are OK, test TCM output signals.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a shorted EPC solenoid can cause transmission damage due to improper line pressure.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on whether the solenoid, wiring, or TCM needs replacement.