P0ED2: Hybrid/EV Battery F Voltage Low

P0ED2 means hybrid/EV battery F delivers less voltage than the controller predicts from current draw and state of charge. No manufacturer documents P0ED2 publicly. Published undervoltage limits exist for whole packs: GM's hybrid tables fail the pack below 24 V (P0ABC), and Ford sets P0A7D during cranking if its pack reads under 184.8 V on plug-in or 167.2 V on full hybrids, or if the weakest cell drops below 2.1 V for half a second. For one unit the limits scale with its number of cells. Typical causes are an aged module with lost capacity, a cell with internal leakage that drained during standstill, or a high-resistance joint that loses voltage under load. Discharge power is cut back. High voltage of unit F is P0ED3, low voltage of unit E is P0ECE.

Symptoms

• Less power in electric mode
• Shorter electric range
• MIL and battery warning

Most likely causes

• Aged module in unit F with lost capacity
• Cell with internal leakage drained during standstill
• High-resistance connection inside unit F dropping voltage under load

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. With the connector unplugged, check whether the signal wire is making contact with ground.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0ED2 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• E: Subsystem depends on the code range
• D2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0ED2?

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 P0ED2?

The most common causes are: aged module in unit F with lost capacity; cell with internal leakage drained during standstill; high-resistance connection inside unit F dropping voltage under load.

Related codes

• P0ED0Hybrid/EV Battery F Voltage
• P0ED1Hybrid/EV Battery F Voltage Unstable
• P0ED3Hybrid/EV Battery F Voltage High
• P0ECEHybrid/EV Battery E Voltage Low
• P0ABCHybrid/EV Battery Pack Voltage Sense A Circuit Low
• P0A7DHybrid/EV Battery Pack State of Charge Low

Sources

• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics
• fordservicecontent.com: OBDSM1901 HEV
• law.cornell.edu: 13 CCR 1968.2

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.