P0E55: DC/DC Converter Current Sensor A Circuit Intermittent/Erratic

P0E55 deals with a current sensor A reading that flickers or vanishes for moments instead of failing for good. FCA documents it repeatedly for the Ram 1500 with eTorque mild hybrid, where the DC/DC converter sits in the 48 V battery pack and is run by the battery pack control module (BPCM). Bulletin 08-030-24 for the 2019 model lists P0E55 among ten BPCM codes; 08-333-25 and its revision 08-283-26 for the 2025 truck with the 3.6 litre V6 name it alone and describe the result: the 12 V battery is not kept charged, runs flat soon after driving and may leave the truck needing a tow, later also with limp-home mode and disabled start/stop. In all cases the fix is new BPCM software, not a part. Steady circuit faults are P0E51, P0E53 and P0E54.

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

MIL on
12 V battery not charging, flat soon after driving
Limp-home mode and start/stop disabled

Most likely causes

Battery pack control module software (FCA eTorque, reflash)
Loose or corroded contact in the sensor path
Current sensor or converter electronics failing intermittently

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
Gently move the wiring with the engine running and watch whether the reading changes.
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 P0E55 means

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

Frequently asked questions

Can I keep driving with code P0E55?

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 P0E55?

The most common causes are: battery pack control module software (FCA eTorque, reflash); loose or corroded contact in the sensor path; current sensor or converter electronics failing intermittently.

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.