P0D37: Hybrid/EV Battery System Current High

P0D37 records excessive current in the high-voltage battery system. Mitsubishi describes it for the 2023 Outlander PHEV: the PHEV-ECU watches the HV circuit for overcurrent whenever the car is ready or charging. Because such a current can damage the contact points of the contactors, the manual requires junction box No. 2 to be replaced, then asks whether the battery controllers, on-board charger, DC/DC converter, A/C unit, power drive unit or rear motor unit store a code, since one of them usually caused the surge; a recurring code within 20 minutes leads to the PHEV-ECU and the drive battery. Mitsubishi shows only the EV system warning, while Ford lists P0D37 with MIL and wrench lamp. Low current is P0D36; a sensor stuck high is P0AC2.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

EV or hybrid system warning, with MIL on some makes
High-voltage system switches off, car not ready or not charging

Most likely causes

Short or fault in an HV component (charger, DC/DC, A/C, inverter)
Contactor points damaged by the overcurrent (junction box)
Damaged high-voltage cable
Hybrid control unit or battery fault (code returns)

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0D37 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
37: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D37?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0D37?

The most common causes are: short or fault in an HV component (charger, DC/DC, A/C, inverter); contactor points damaged by the overcurrent (junction box); damaged high-voltage cable.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.