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P1A3700 — Cell module control unit – implausible overvoltage

Cell module control unit – implausible overvoltage. The Taycan report this code; below is which control unit sets it on each model and how to read and clear it.

Which models and control units set P1A3700

Porsche Taycan

Battery Energy Control Module

How to read and clear P1A3700

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and P1A3700 shows with its status, its full description and the freeze frame when the unit stores one.
  3. Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.

More about fault memory in the manual →

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Other codes of the Battery Energy Control Module

P0E3000High Voltage Fuse "C"
P0E7400Hybrid/EV Battery Voltage Internal Isolation Fault
P151A00Control module, incorrect code
P160900Crash switch-off was triggered
P168A00Reversible crash shut-off was triggered
P1A0100Crash signal monitoring, failed
P1B1500Hybrid battery precharge resistance, Excess temp.
P1B1600Charging hybrid battery, No external charge detected
P1B1B00Control unit – function restriction
P1B3D00Control unit – Function limitation
P1CA800Crash signal monitoring, failed
P1D0100Warning: Capacity jump

All 198 codes of this control unit →

Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.