P2E71
Low Severity (Level 2)Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit High
P2E71 usually means hybrid/EV Battery Pack B Cell Thickness Sensor Circuit High.
Can you still drive with P2E71?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $100 – $500
Severity Level 2 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Engine may run rich or have poor fuel economy (PCM sees faulty signal)
- Electrical system reading abnormally high or staying at maximum
- Diagnostic trouble code (DTC) stored in module memory
- Fault may be intermittent — code may clear itself and reappear
- Reduced vehicle functionality related to the battery voltage/system voltage
Possible Causes
- Failed battery — internal short causing abnormally high voltage signal to the control module
- Wiring shorted to a 5V reference or 12V power wire in the same harness — wires melted together or chafing at a common point
- Poor ground connection for the battery voltage/system voltage — high resistance in ground path causes voltage to read high
- Faulty voltage regulator or power supply within the battery
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($49-145 at shop, free at auto parts store for basic scan)
- Visually inspect the battery voltage/system voltage wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $63 diagnostic fee at shop)
- Test battery with a multimeter at the connector — compare readings to factory service manual specs. If out of spec, replace battery ($100-500)
- Check the reference voltage supply to battery — should be steady 5V (or 12V) — if low, trace back to PCM/BCM voltage regulator ($106-500 if module repair needed)
- Perform a voltage drop test on the ground side of the battery voltage/system voltage circuit — more than 0.1V drop means a bad ground that must be cleaned/repaired ($98-231 at shop)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does P2E71 mean?
P2E71 stands for "Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit High". P2E71 usually means hybrid/EV Battery Pack B Cell Thickness Sensor Circuit High.
Can you drive with P2E71?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix P2E71?
Repair costs for P2E71 typically range from $100 to $500, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($49-145 at shop, free at auto parts store for basic scan); Visually inspect the battery voltage/system voltage wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $63 diagnostic fee at shop); Test battery with a multimeter at the connector — compare readings to factory service manual specs. If out of spec, replace battery ($100-500).
Will P2E71 clear itself?
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