P2DC3: Starter/Generator Phase Y Current Sensor Circuit

The current sensor for starter/generator phase Y reports a circuit fault. Phase current measurement is unreliable.

Most likely causes

• Current sensor failed
• Wiring fault

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Make sure the battery cooling air intake is clean
3. Check the 12 V auxiliary battery, which can also trigger warnings
4. Leave any high-voltage measurements to a specialized repair shop

Good to know

• Repair difficulty: hard
• It can trigger limp mode.

What each character of P2DC3 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• D: Subsystem depends on the code range
• C3: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2DC3?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P2DC3?

The most common causes are: current sensor failed; wiring fault.

Related codes

• P2DC1Starter/Generator Phase X Current Sensor Circuit
• P2DC5Starter/Generator Phase Z Current Sensor Circuit

Sources

• github.com: dtc database
• en.wikipedia.org: Starter (engine)
• en.wikipedia.org: Brushless DC electric motor

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.