Faulty precharge resistor in the battery charger circuit; Sticking or failed precharge contactor; Open or high-resistance wiring in the precharge circuit; Poor connection at the precharge resistor or contactor terminals; Failed battery charger control module; Low 12-volt battery causing control module misoperation

DTC codes / P0Dxx · Hybrid propulsion / P0D26

P0D26Battery Charger System Precharge Time Too Long

Q: What does code P0D26 mean?

Battery Charger System Precharge Time Too Long. The P0D26 code indicates that the battery charger system's precharge phase is taking longer than expected, as detected by the control module monitoring the precharge circuit. The computer sets this code when the precharge time exceeds a calibrated threshold, typically because the precharge resistor, contactor, or associated wiring is faulty.

The P0D26 code indicates that the battery charger system's precharge phase is taking longer than expected, as detected by the control module monitoring the precharge circuit. The computer sets this code when the precharge time exceeds a calibrated threshold, typically because the precharge resistor, contactor, or associated wiring is faulty.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or service vehicle soon message
Often no symptoms besides the warning light
Failure of the high-voltage battery to charge properly
Reduced electric driving range or performance
Audible clicking from the battery charger contactors without normal charging
The vehicle may refuse to start or enter ready mode

Common causes, most likely first

Faulty precharge resistor in the battery charger circuit
Sticking or failed precharge contactor
Open or high-resistance wiring in the precharge circuit
Poor connection at the precharge resistor or contactor terminals
Failed battery charger control module
Low 12-volt battery causing control module misoperation

How to diagnose and fix it

Verify the 12-volt battery is fully charged and in good condition
Use a scan tool to read all stored codes and freeze-frame data related to the precharge system
Inspect the precharge resistor and contactor for signs of overheating, corrosion, or damage
Check the resistance of the precharge resistor and compare to specifications
Test the precharge contactor operation and circuit continuity with a multimeter
Repair or replace any faulty wiring, connections, resistor, or contactor as needed
Clear codes and perform a road test to confirm the precharge time returns to normal

Precharge Circuit Checks Before Parts Replacement

A weak or failing 12-volt battery often causes this code because the control module may not operate the precharge contactor reliably.
The precharge resistor can test good at room temperature but fail when hot, so perform resistance checks both cold and after warming.
Corroded or loose ground connections at the battery charger or chassis can mimic a failed precharge resistor.
This code does not always mean the battery charger assembly is defective; the precharge contactor or its wiring is a more common culprit.
Some vehicles set P0D26 intermittently due to a sticking contactor that only acts up in cold weather, so replicate the conditions during diagnosis.

Can I keep driving with P0D26?

It is generally safe to drive the vehicle short distances to a repair shop, but avoid long trips or relying on the charging system until the fault is repaired. If the vehicle fails to start or charge, do not continue driving.

Tools that help

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