P0DD2: Hybrid/EV Battery Cell Balancing Circuit J Stuck Off

P0DD2 marks circuit J as unable to bleed: balancing is commanded, but the six cells of group J keep their charge. Ford lists the code in its 2015 hybrid OBD summary with the same power-up test as for the stuck-on case, run for 100 ms with the contactors still open, two consecutive power cycles and the 75 mV limit against the average cell voltage. GM's 2013 eAssist table documents a more direct test under its own code P1EAA: with the key off and the contactors open, a cell's balancing resistor is switched on and the cell voltage has to move by at least 0.1 V; two failed samples across key cycles give a Type A fault. Over many charges group J ends up high and caps the full charge. Opposite: P0DD1.

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

Check engine light without noticeable change in driving
Cells of group J at the top of the cell list at the end of charging
Usable battery capacity declining over time

Most likely causes

Bleed resistor of circuit J open or burnt
Balancing switch of group J no longer closing
Interrupted balancing lead between cell tap and board

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
Use the scanner to command the movement and compare the actual position with the requested one.
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 affects emissions.

What each character of P0DD2 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
D2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0DD2?

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 P0DD2?

The most common causes are: bleed resistor of circuit J open or burnt; balancing switch of group J no longer closing; interrupted balancing lead between cell tap and board.

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.