P2D48

Code

Generic P — Powertrain

Hybrid/EV Battery Pack D Over Temperature

Brand: Generic

Type: P — Powertrain

Views: UK: 37 EN: 45 RU: 32

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Page language: EN

Causes

Actual high temperature in battery pack D (cell or module overheating).
Failure or inaccurate reading from a battery temperature sensor or thermistor.
Cooling system failure for the battery pack (fan, coolant pump, clogged passages, low coolant).
Restricted airflow or blocked vents around the battery pack.
High continuous electrical load or rapid charging causing excessive heat generation.
Wiring, connector corrosion, or poor grounding in the temperature sensor circuit.

Symptoms

HV battery/warning lamp or thermal warning displayed in instrument cluster.
Reduced propulsion power, limp mode, or restricted regenerative braking.
Charging disabled or charging rate reduced.
Unusual heat coming from underbody or battery area; sometimes odor of overheating.
Diminished range or rapid state-of-charge change during use.

What to check

Read DTCs and freeze-frame data with a compatible scan tool; note stored timestamps and conditions.
Capture live BMS data: pack D temperature(s), cell/module temperatures, pack voltage/current, and cooling system status.
Visually inspect battery pack area for coolant leaks, debris, or physical damage.
Verify operation of battery cooling fans and coolant pump (listen, command via scan tool if available).
Inspect harnesses and connectors to the temperature sensors and BMS for corrosion, damage, or loose pins.
Measure temperature at the pack/modules with an independent contact or infrared thermometer to confirm readings.

Signal parameters

Battery pack D temperature (°C/°F) — live values and min/max during event.
Individual module/cell temperature sensors for pack D (if available).
Battery pack voltage (V) and current (A) at time of fault.
Battery coolant temperature and flow status (if liquid-cooled).
Cooling fan speed (RPM) and commanded state.
BMS fault codes and status flags related to thermal management.

Diagnostic algorithm

Safety first: follow high-voltage safety procedures, disable HV system and wear appropriate PPE before accessing the battery pack.
Use an OEM-capable diagnostic tool to read P2D48 and any related codes; record freeze-frame and live data.
Confirm the fault is repeatable: note conditions that produced the code (idle, charge, heavy load, ambient temp).
Compare BMS-reported temperatures with an independent measurement at the pack surface and modules where accessible.
Inspect and test temperature sensor circuits: check connector pins, measure sensor resistances against spec, check for shorts to ground/power.
Verify cooling system operation: command fans/pump via scan tool, measure coolant level/pressure, inspect hoses and radiator/heat exchanger.
Check for airflow obstructions or damage to underbody shields that might trap heat.
If a sensor or harness fault is found, repair or replace the sensor/harness and clear codes; then retest under same conditions.
If cooling components fail, repair or replace (fan motor, pump, hoses, coolant) and verify restoration of normal pack temperature behavior.
If temperatures remain high with cooling systems functional, isolate the pack and perform a more detailed cell-level diagnostic (voltage imbalance, internal shorts) or consult OEM battery repair procedures.
After repairs, clear codes and perform a road/charge cycle to confirm the fault does not return; monitor BMS data for recurrence.
If internal battery damage or thermal event is suspected, follow manufacturer procedures for safe removal, module replacement, or disposal and contact specialist support.

Likely causes

Faulty battery temperature sensor (open, shorted, or intermittent).
Battery pack cooling fan failed or not commanded on.
Battery coolant leak, low coolant level, or failed coolant pump (if liquid-cooled).
Obstructed air pathway or debris preventing cooling of the pack.
Excessive charge/discharge event (fast charge or heavy load) raising pack temperature.
Damaged wiring or connector to the BMS/temp sensor causing erroneous high-temp reading.

Fault status

⚠️ Status

Battery Pack D over-temperature detected by the BMS. Vehicle may reduce power, disable charging, or enter limp mode to protect the battery. Immediate inspection of cooling system, sensors, and pack condition is required.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2-6 hours