P0D24 – Hybrid/EV Battery Charger HV Output Low

P0D24 is an OBD-II trouble code you’ll usually see on modern hybrid and electric vehicles, and it points to a problem in the battery charger or high-voltage charging circuit. When this code sets, your car’s control module has detected a performance or range issue in one of the charger’s internal sensors or circuits. You might notice slower charging, reduced electric range, or the MIL/check engine light. Understanding what P0D24 means, how it behaves, and how to diagnose it will help you decide whether you can keep driving or need repairs right away.

What Does P0D24 Mean?

P0D24 is a generic hybrid/EV diagnostic trouble code that typically translates to something like “Battery Charger Temperature Sensor ‘B’ Circuit Range/Performance” or a similar charger-related performance fault, depending on the manufacturer. In simple terms, the powertrain control module (PCM) or hybrid/EV control module sees a signal from a charger-related sensor that doesn’t make sense compared with expected values.

The ECU constantly monitors the on-board charger’s voltage, current, and temperature sensors. If sensor “B” (or a secondary sensor circuit) reads outside the expected range for a certain time, the module flags P0D24 and may limit charging or power to protect the high-voltage battery and charger components.

Quick Reference

• Code: P0D24
• Type: Hybrid/EV battery charger performance fault
• Severity: Moderate to high (charging and battery life impact)
• Common Symptoms: Reduced charging performance, warning lights, possible reduced power
• Typical Fixes: Wiring repair, sensor replacement, charger replacement, software update

Real-World Example / Field Notes

In the shop, I usually see P0D24 on plug-in hybrids and full EVs that come in with a complaint like “won’t fully charge” or “charging stops after a few minutes.” One example was a plug-in SUV that charged fine at home for years, then suddenly started cutting off at 40–50% state of charge. The owner also noticed the cooling fans running more often during charging. Pulling codes showed P0D24 stored along with a charger temperature plausibility code. After testing, we found a high-resistance connection in the charger temperature sensor circuit. Repairing the wiring and clearing the codes restored normal charging without replacing the expensive charger module.

Symptoms of P0D24

• Check engine light or hybrid/EV system warning lamp illuminated
• Reduced charging speed or charging that stops prematurely
• Limited electric range or vehicle staying in gasoline mode on plug-in hybrids
• Battery cooling fans running more often or louder than normal during charging
• Charging error messages on the instrument cluster or infotainment screen
• Possible reduced power or “limp” mode to protect the high-voltage system
• High-voltage battery not reaching its normal state of charge percentage

Common Causes of P0D24

Most Common Causes

• Faulty or drifting charger temperature sensor or internal sensor “B”
• Damaged wiring or connectors in the charger sensor circuit (corrosion, broken wires, loose pins)
• Poor ground or power supply to the on-board charger module
• Overheating of the charger due to restricted cooling (coolant flow issues or blocked airflow)
• Internal charger module failure affecting sensor readings or internal reference voltage

Less Common Causes

• Coolant leaks or low coolant level in the hybrid/EV cooling loop affecting charger temperature
• Incorrect or incompatible charging equipment causing abnormal load or heat buildup
• Software or calibration issues requiring an ECU/charger firmware update
• Previous collision damage or improper repairs near the charger or high-voltage wiring
• Water intrusion into the charger housing or connectors

Diagnosis: Step-by-Step Guide

You’ll want at least a quality scan tool that can read hybrid/EV modules, a digital multimeter (DMM), and ideally access to factory service information or wiring diagrams. An infrared thermometer or scan-tool data stream for charger temperature can also be very helpful. Because this involves high-voltage components, follow all safety procedures. If you’re not comfortable around HV systems, let a qualified technician handle the deeper testing.

1. Confirm the code and check for companions. Connect a scan tool, read all stored codes, and note freeze-frame data. Look for related charger, coolant pump, or battery temperature codes that might point to the same root cause.
2. Inspect charging behavior. If safe, plug in the vehicle and observe. Note whether charging starts then stops, or never initiates. Watch the instrument cluster for error messages and listen for cooling fans or pumps.
3. Visual inspection of wiring and connectors. With the vehicle powered down and following HV safety procedures, inspect the charger harness and connectors. Look for corrosion, green crust on pins, damaged insulation, or signs of overheating or water intrusion.
4. Check coolant and cooling components. On vehicles where the charger is liquid-cooled, verify coolant level, condition, and that the appropriate pump runs during charging. A stuck pump or air in the system can cause the charger to overheat and trigger P0D24.
5. Monitor live data. Use the scan tool to watch charger-related PIDs (temperature sensor “B”, charger temperature, charger current, etc.). Compare the sensor “B” reading to other temperature sensors. If one reading is way off from ambient or other sensors, it’s suspect.
6. Check sensor circuit integrity. Using a wiring diagram, backprobe the sensor “B” circuit at the charger or control module. Measure reference voltage, signal voltage, and ground integrity. Look for open circuits, shorts to ground, or shorts to voltage.
7. Perform resistance tests (if allowed). With the system powered down and per service manual instructions, measure the resistance of the temperature sensor or related component. Compare to factory specs at a known temperature.
8. Review Mode $06 data. Some scan tools allow you to see non-continuous monitor test results. Check for marginal test values on charger or temperature monitors that may not yet have triggered additional codes.
9. Check for TSBs and software updates. Many manufacturers release technical service bulletins for hybrid/EV charger issues. A simple ECU or charger software update can sometimes correct false P0D24 triggers.
10. Evaluate charger module condition. If wiring, sensors, cooling, and software all check out, the internal charger electronics may be failing. At this point, most shops confirm with advanced tests or by substituting a known-good unit.

Pro tip: Always compare charger temperature data to ambient and other temperature sensors. If the charger sensor “B” is reading abnormally high or low while everything else looks normal, you’ve narrowed the fault down to that circuit or sensor rather than the entire charger.

Possible Fixes & Repair Costs

Repairs for P0D24 can range from simple wiring fixes to major component replacement. If you catch it early and the issue is just a corroded connector or damaged wire, you might be looking at $100–$300 in labor and materials. A failed temperature sensor that’s separate from the charger may run $200–$500 installed. If the on-board charger itself is faulty and not covered by warranty, replacement can easily cost $1,000–$3,500 or more, depending on vehicle make, parts availability, and whether programming is required. Software updates or TSB-related reprogramming are typically on the lower end, around $100–$250 at many dealers or specialty shops.

Can I Still Drive With P0D24?

In many cases you can still drive with P0D24 present, but with limitations. The car may reduce or disable plug-in charging, limit electric-only operation, or go into a reduced-power mode to protect the battery and charger. For a plug-in hybrid, you might be able to operate mostly on the gasoline engine, but your fuel economy and performance can suffer. For a full EV, your usable range may be reduced and fast charging may be disabled. You should avoid long trips and get the code diagnosed as soon as possible, especially if you notice overheating, strong odors, or repeated charging interruptions.

What Happens If You Ignore P0D24?

Ignoring P0D24 can lead to overheating and premature failure of the on-board charger or even damage to the high-voltage battery pack. What starts as a minor sensor or wiring issue can turn into a very expensive charger or battery replacement if the system keeps operating outside its safe temperature or current range.

Last updated: January 22, 2026

Vehicles Commonly Affected by P0D24

P0D24 shows up most often on late-model hybrids, plug-in hybrids, and full EVs from manufacturers like Chevrolet (Volt, Bolt), Cadillac, GMC, Ford, Toyota, Lexus, Hyundai, Kia, BMW, and Nissan. It’s particularly common on vehicles that use liquid-cooled on-board chargers and have complex high-voltage cooling loops. Fleet vehicles and daily-driven plug-in hybrids that see frequent charge cycles and harsh climates (hot or very humid environments) also tend to log this code more often due to thermal stress and corrosion in charger wiring.