01 Why Your Garage Has Customers But No Profit • 02 What Are the Symptoms of a Failing Transmission Control Mod… • 03 Drivers Urged To Check Their Car Mirrors After Hidden Safet… • 04 Can a Hybrid Car Survive a Flood? Understanding the Risks a… • 05 Why Does a Car Run Worse After Cleaning the MAF Sensor? • 06 The Embarrassing Reason Some Drivers Keep Burning Through H… • 07 How Mobile Mechanics Are Changing the Industry (And Making … • 08 Here's Why Your Car Feels Sluggish Even With A Full Tank Of… • 09 Why Did Jaguar Land Rover Suddenly Stop Shipping Cars to th… • 10 B0042, B0043, and B0044: Left Front or Driver Frontal Deplo… •

DTC codes / P2Exx · Hybrid propulsion / P2E2D

P2E2DBattery Charger A Module Supply Voltage Low

P2E2D indicates that the powertrain control module has detected a low supply voltage at the battery charger control module designated as 'A'. The computer monitors the voltage feed to this module and sets the code when the signal falls below the expected threshold for a calibrated time, pointing to a power delivery problem rather than a charging output fault.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message with no other noticeable change in driving behavior.
  • The battery charger module may fail to activate, leaving the high-voltage battery at a lower state of charge than normal.
  • A warning message on the instrument cluster indicating a charging system fault or reduced electric range.
  • Intermittent operation of the battery charger, where charging starts and stops unpredictably.
  • The vehicle may enter a reduced power mode or refuse to start if the low voltage persists and depletes the auxiliary battery.
  • Often no symptoms besides the warning light, especially if the fault is intermittent and the module still receives enough voltage to function.

Common causes, most likely first

  1. A weak or failing 12-volt auxiliary battery that cannot maintain stable voltage under load.
  2. Corroded, loose, or damaged wiring and connectors on the power supply circuit to the battery charger module.
  3. A blown fuse or tripped fusible link in the dedicated supply circuit for the charger module.
  4. High resistance in a ground connection shared by the charger module and the chassis.
  5. An internal fault in the battery charger module causing excessive current draw or a short on its supply input.
  6. Voltage drop across a relay or contactor that feeds the charger module, often due to pitted contacts.
  7. A charging system fault, such as a failing alternator or DC-DC converter, that drags the entire 12-volt supply low.

How to diagnose and fix it

  1. Perform a battery test with a conductance tester and load test the 12-volt auxiliary battery; replace it if it fails.
  2. Inspect and clean the battery terminals, then check the dedicated fuse and relay for the battery charger module supply circuit.
  3. Measure voltage at the charger module connector with the key on and compare it to battery voltage; a difference greater than 0.5 volts indicates excessive voltage drop.
  4. Perform a voltage drop test on both the positive supply wire and the ground circuit while the module is commanded on.
  5. Check for technical service bulletins or software updates for the charger module that address low-voltage supply thresholds.
  6. If all wiring and power sources test good, substitute a known-good charger module or perform a guided diagnostic using the manufacturer's scan tool to confirm an internal module fault.

Low voltage does not always mean a bad module

  • A common misdiagnosis is replacing the battery charger module when the real culprit is a corroded ground strap or a failing 12-volt battery that sags under load.
  • The code can be set by a momentary voltage dip during engine cranking, so always check for a weak battery before condemning the charger.
  • Some vehicles use a dedicated voltage stabilizer or capacitor on the charger supply circuit, and a failed stabilizer will set this code without any wiring fault.
  • A charger module that is internally shorted can pull the supply voltage low and set P2E2D, but it may also cause the fuse to blow repeatedly, so check for a shorted input before installing a new fuse.
  • This code is often stored alongside communication codes if the low voltage disrupts the module's ability to transmit data on the network.

Can I keep driving with P2E2D?

You can usually drive the vehicle short distances to a repair shop, but avoid relying on high-voltage charging and do not ignore the warning for long, because a persistent low supply can leave you stranded with a depleted auxiliary battery. If the vehicle enters reduced power mode or the charging system warning is accompanied by other electrical faults, stop driving and arrange a tow.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage