P0E6A: Battery Charging System Precharge Contactor Circuit

P0E6A is the general code for the precharge contactor of the battery charging system. Before the main charging contactors close, this small contactor feeds the charger side through a resistor so the voltage can rise gently towards pack voltage; without it the main contacts would arc. The code collects faults of this branch that fit none of the more specific siblings. No manufacturer documents P0E6A publicly. GM's 2019 hybrid tables watch the same function under their own codes: the charger bus must reach 95 to 105 percent of pack voltage within 0.7 seconds (P0D26), and battery current above 3 A for about 87 ms during precharge sets P3061, both Type A. CARB requires charger malfunctions that block charging to be detected. Stuck faults are P0E6B and P0E6C, coil circuit faults P0E6D to P0E70.

Symptoms

• Charging session aborts right at the start
• Charging not possible, driving usually still possible

Most likely causes

• Precharge resistor burnt open or overheated
• Worn or sluggish precharge contactor in the charging path
• Charger-side voltage measurement reading wrongly

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

What each character of P0E6A means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• E: Subsystem depends on the code range
• 6A: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0E6A?

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 P0E6A?

The most common causes are: precharge resistor burnt open or overheated; worn or sluggish precharge contactor in the charging path; charger-side voltage measurement reading wrongly.

Related codes

• P0E6BBattery Charging System Precharge Contactor Circuit Stuck Closed
• P0E6CBattery Charging System Precharge Contactor Circuit Stuck Open
• P0E6DBattery Charging System Precharge Contactor Control Circuit/Open
• P0D26Battery Charger System Precharge Time Too Long
• P0AE1Hybrid/EV Battery Precharge Contactor Circuit

Sources

• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics
• 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.