P2E70

Code

Generic P — Powertrain

Hybrid/EV Battery Pack B Cell Thickness

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 28 RU: 24

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Cell swelling (gas generation/expansion) in one or more cells of B cell group
Mechanical deformation or foreign object inside module/pack
Faulty height/thickness/pressure sensor or its wiring for B cell group
Incorrect calibration or software/firmware error in battery management system (BMS)
Cooling system failure causing overheating and cell expansion
Manufacturing defect or aging-related cell degradation

Read and record stored DTCs, freeze frame and BMS data with a compatible scanner
Visually inspect battery pack and module B for bulging, leaks, corrosion or foreign objects
Check cooling system operation and coolant temperature/flow for module B
Verify CAN/diagnostic communications to the BMS and module sensors
Check connectors and wiring for the thickness/height/pressure sensor on B module
Measure individual cell voltages, temperatures and internal resistance for B cell group

B module thickness/height (mm) — compare to manufacturer specification
Height/thickness sensor voltage or ADC reading (V or counts) — stable and within expected range
Individual cell voltages in B group (V) — look for imbalance
Cell temperatures for B group (°C) — check for hotspots
Module internal resistance or DCIR for cells in B group (mΩ)
Pack state of charge (SOC %) and charge/discharge current (A)

Retrieve all DTCs and freeze-frame data using a manufacturer-capable scan tool; save logs.
Observe and record live data: B module thickness sensor, cell voltages, cell temperatures, SOC and charge/discharge currents.
Visually inspect the pack and module B area for bulging, leaks, loose fasteners, foreign objects and cooling lines; do not open HV components unless qualified.
Verify sensor wiring and connectors for damage, corrosion or poor contact; repair connectors as needed and re-scan.
If available, measure module or cell stack thickness with calipers where safe/accessible and compare to spec. Note: only perform non-intrusive measurements unless qualified for HV service.
Check cell voltages and internal resistance on module B (use appropriate HV isolation procedures and tools or have a qualified technician perform this). Look for high resistance or significantly lower/higher voltages compared to other modules.
Inspect and test coolant flow/temperature to module B; repair cooling faults and retest.
If sensor calibration or software is suspected, verify BMS software/calibration version and reflash or recalibrate per OEM procedure.
If a cell(s) is confirmed swollen or failing, follow manufacturer procedures for module or pack replacement. Do not attempt to puncture or disassemble swollen cells. Dispose/repair through approved HV battery service.
After repairs, clear codes and perform full system relearn/calibration and a road/functional test. Monitor for recurrence.