P0E22 – Hybrid/EV Battery Heater “B” Control Circuit Range/Performance

If your hybrid or electric vehicle has triggered code P0E22, you’re dealing with a problem in the high-voltage charging system, not just a random glitch. This code usually points to an issue with the onboard charger, charge port, or related wiring that manages how your HV battery is charged. While the car may still drive, ignoring P0E22 can shorten battery life or leave you unable to charge at all. Below, you’ll learn what P0E22 means, common symptoms, likely causes, and how you or your shop can diagnose and repair it.

What Does P0E22 Mean?

P0E22 is a generic hybrid/EV diagnostic trouble code that indicates a fault in the high-voltage charging system, typically an “Onboard Charger Performance” or “Charge Port/Charger Control Circuit” issue. The exact wording varies by manufacturer, but the idea is the same: the ECU has detected abnormal voltage, current, or communication in the charging circuit.

The Powertrain Control Module (PCM) or Hybrid/EV Control Module monitors the onboard charger, charge port, and associated sensors. If charging behavior or circuit feedback falls outside the expected range for a set time, it stores P0E22 and usually turns on the MIL (check engine light) and/or a charging system warning.

Quick Reference

• Code: P0E22
• Type: Hybrid/EV high-voltage charging system fault
• Typical Area: Onboard charger, charge port, HV battery charging circuit
• Severity: Moderate to high (may prevent charging or damage HV battery)
• Safe to drive? Sometimes, but charging may be limited or disabled

Real-World Example / Field Notes

In the shop, P0E22 often shows up after a customer complains that their plug-in hybrid or EV “won’t charge” or stops charging after a few minutes. On one plug-in hybrid I worked on, the owner noticed the charge indicator light on the dash would come on, then shut off within a minute. The scan tool showed P0E22 along with a charger temperature sensor fault. The onboard charger’s internal temperature sensor had drifted out of spec, causing the ECU to shut the charger down as a safety measure. Replacing the charger assembly and inspecting the charge port wiring solved the issue and restored normal charging.

Symptoms of P0E22

• Check engine light or hybrid/EV warning light illuminated
• Charging problems – vehicle won’t charge or stops charging prematurely
• Reduced EV range because the HV battery never reaches full charge
• Charging error messages on the instrument cluster or infotainment screen
• Slower than normal charging at home or public charging stations
• Cooling fan noise from the charger area running more than usual
• Intermittent charging – works some days, fails on others
• Stored companion codes related to charger temperature, voltage, or communication

Common Causes of P0E22

Most Common Causes

• Faulty onboard charger module (internal failure or sensor drift)
• Damaged or corroded charge port connector or pins
• High resistance or open circuit in charger power or ground wiring
• Cooling system issues for the charger (low coolant, air pockets, blocked passages)
• Loose or poor electrical connections at the charger, HV junction box, or battery

Less Common Causes

• Faulty charger temperature or voltage sensor (internal or external)
• Software/calibration issues in the Hybrid/EV Control Module or PCM
• Water intrusion into the charger, charge port, or wiring harness
• Defective HV battery current sensor or contactor feedback circuit
• Damaged wiring from collision, improper jack placement, or rodent activity

Diagnosis: Step-by-Step Guide

To diagnose P0E22 properly, you’ll want a quality scan tool with hybrid/EV capabilities, a digital multimeter (DMM), basic hand tools, and access to factory service information or wiring diagrams. For high-voltage testing, professional-grade insulated tools and proper safety gear are mandatory. If you’re not trained on HV systems, leave the high-voltage work to a qualified technician.

1. Verify the complaint. Confirm the check engine or EV warning light is on and attempt to charge the vehicle. Note any error messages on the dash or charger display.
2. Scan for codes. Use a scan tool to read all DTCs from the PCM, Hybrid/EV Control Module, and Battery Energy Control Module. Record freeze-frame data and look for related charger, battery, or communication codes.
3. Check live data. Monitor charger voltage, current, temperature, and charger status while attempting to charge. Abnormal readings (no current flow, instant over-temp, etc.) help narrow the fault.
4. Inspect the charge port. With charging disconnected, visually inspect the charge port and vehicle inlet for bent pins, corrosion, melted plastic, or debris. Repair or replace damaged components as needed.
5. Inspect wiring and connectors. Follow the harness from the charge port to the onboard charger and related modules. Look for chafed insulation, pinched wires, loose connectors, or signs of water intrusion.
6. Check charger power and grounds. Using a DMM and wiring diagram, verify proper 12V power, ground, and control signals at the charger connector (low-voltage side). Poor grounds and low supply voltage are common issues.
7. Evaluate charger cooling. On liquid-cooled systems, check coolant level, flow, and for air in the system. Some vehicles have a dedicated pump and loop for the charger. Overheating or no flow can trigger P0E22.
8. Use Mode $06 and self-tests. If your scan tool supports Mode $06 or charger self-tests, review test results for onboard charger performance, sensor ranges, and internal faults.
9. Check for TSBs and updates. Look up technical service bulletins for your vehicle. Some manufacturers have known issues with specific charger models that require software updates or revised parts.
10. Confirm charger or module failure. If power, grounds, wiring, and cooling all check out, and data points to an internal fault, the onboard charger or related control module is likely defective and needs replacement.

Pro tip: Before condemning an expensive charger, always load-test the 12V battery and verify charging system health. Weak 12V supply voltage can cause false high-voltage charging faults and intermittent P0E22.

Possible Fixes & Repair Costs

The exact repair for P0E22 depends on what you find during diagnosis. Common fixes include repairing or replacing damaged charge port connectors, cleaning and tightening grounds, repairing wiring, bleeding the charger cooling system, or replacing the onboard charger module. Typical repair costs range from about $150–$350 for simple wiring or connector repairs, $300–$700 for cooling system work, and $1,000–$3,000+ for an onboard charger replacement. Costs vary by vehicle make, parts availability, labor rates, and whether you use OEM or remanufactured components.

Can I Still Drive With P0E22?

In many cases, you can still drive with P0E22 stored, especially if the car already has some charge in the HV battery. However, you may not be able to recharge once the battery is depleted, leaving you stranded or stuck in reduced-power mode. Some vehicles will limit EV-only operation or disable plug-in charging entirely, relying more heavily on the engine (for plug-in hybrids). Treat this code as something that needs prompt attention, not something to ignore for weeks.

What Happens If You Ignore P0E22?

If you ignore P0E22, you risk damaging the onboard charger or HV battery, losing the ability to charge at home or at public stations, and potentially triggering more severe high-voltage faults. Over time, repeated failed charging attempts and overheating can shorten component life and significantly increase repair costs.

Last updated: January 22, 2026

Vehicles Commonly Affected by P0E22

P0E22 is a generic OBD-II code, so you’ll see it across many hybrid and electric vehicles. It’s especially common on plug-in hybrids and full EVs from manufacturers such as Chevrolet (Volt, Bolt), Toyota and Lexus (Prius Plug-in, RAV4 Prime, various Lexus hybrids), Ford (Fusion Energi, Escape/Explorer hybrids), Hyundai and Kia (Ioniq, Niro, Kona EV), Nissan (Leaf), and some European brands with plug-in models. The underlying systems are similar, but diagnostic procedures and parts locations vary by make and model.