P0D25

What it means

P0D25 means the battery charger control unit saw the precharge phase of the charging system finish faster than expected. Precharge gently brings up the voltage in the charger's high-voltage circuit before the main contactors close. A time that is too short suggests the circuit was already energised, the voltage was misread, or the precharge path is not limiting current as designed. Exact precharge timing and monitoring strategy vary by model.

Symptoms

• Warning light for the hybrid or EV system, or a general fault light
• Vehicle will not charge, or charging starts and then stops
• Charging is slower than normal or limited
• Charge port or charging status indicator shows a fault
• Reduced power or the high-voltage system refusing to start in some cases

Possible causes

• Faulty high-voltage voltage sensor or sensor circuit giving a wrong reading during prechargelikely
• Poor connection, corrosion or damaged wiring at the charger module, charge inlet or high-voltage interlock circuitlikely
• Precharge relay, contactor or precharge resistor faulty or bypassed (for example a contactor stuck closed)possible
• Low or unstable 12 V supply upsetting the charger control unit's timing and readingspossible
• Internal fault in the onboard charger or its control unitpossible
• Outdated or faulty control unit software where the manufacturer has identified it as a causerare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting charge state, voltages and whether the fault happened during charging or at start-up
2. Check the condition and charge of the 12 V battery and its terminals, and fix any fault there first as it can cause related codes
3. Visually inspect the charge inlet, charger module connectors and wiring for water, corrosion, heat damage or chafing, without touching high-voltage components unless qualified
4. Have a person trained in high-voltage systems isolate the system following the manufacturer's safe procedure before any work on orange cabling or components
5. Using live data, compare charger input and DC link voltage readings with the battery pack voltage during the precharge phase to spot an implausible reading
6. Test the precharge relay or contactor operation and precharge resistor against the manufacturer's specification, as the test depends on the model
7. Check the high-voltage interlock circuit for continuity and correct operation
8. Check for manufacturer service bulletins or software updates relating to this code for the specific model

How to fix

• Repair or replace damaged wiring, connectors or terminals found in the charger or interlock circuits
• Replace a faulty voltage sensor or repair its circuit
• Replace a faulty or stuck precharge relay, contactor or precharge resistor
• Restore the 12 V supply by charging or replacing a weak battery and cleaning poor connections
• Replace the onboard charger or its control unit if internal faults are confirmed
• Apply a manufacturer software update only if an outdated calibration is a known cause for the vehicle

Can I keep driving?

Nearby codes

• P0D24GenericBattery Charger A Temperature Too High
• P0D26GenericBattery Charger System Precharge Time Too Long