Diagnostic trouble code

P33ED — Battery Parallel Diagnosis (the Nissan LEAF recall code)

P33EDMay need towing — read the guidance below

What it means in plain English

A sudden voltage jump was detected in a pack module — and on many LEAFs this code is covered by recall.

P33ED is set when the battery controller sees a sudden voltage change in one of the pack's modules. Nissan's own possible-cause list for it has exactly one item: a module. Your scan tool may show it as “BATTERY PARALLEL DIAGNOSIS.” What makes this code different from every other code on this site is money: on 2019–2022 LEAFs it sits at the centre of an open safety recall, and whether it is stored decides whether Nissan reprograms the car or replaces the high-voltage battery at Nissan's expense. If you have this code, the first thing to do is not to get a quote — it is to check your VIN.

Which Toyota and Lexus models this applies to

Nissan LEAF. Verified in the service manual for the 2011–2015 (ZE0) car, and central to the open recall covering 2019–2022 LEAFs. The recall position depends on your specific VIN, not on the model year alone.

Possible causes

Plural on purpose. Any of these can produce this result — which is exactly why a code is not a diagnosis.

A single module with an internal defect — the only cause Nissan's own list names.
Swollen or leaking cells, which is the field pattern on the larger 62 kWh packs.
A module sense lead or bus-bar joint at fault, making a voltage step appear where the cells are fine — which is why Nissan has a technician re-read cell voltages to name the specific cell before condemning anything.

What a professional diagnostic process should check

1Check the VIN for open recalls before any paid diagnosis. This is the first step, not a formality.
2Check whether P33ED is stored as current OR past status. The recall wording covers both, so a code that has already been cleared still counts.
3Read per-cell voltages via live data or freeze-frame to identify the specific cell, which is what Nissan's procedure asks for.
4Check whether P33E6, P0A1F or P3062 are stored at the same time.
5Check high-voltage battery temperature — the recall's test drive pattern cannot be run below about 68°F.
6Review state-of-charge fluctuation history, which is the symptom Nissan tells owners to report.

What you can safely do now

Check your VIN at nhtsa.gov/recalls right now. If the battery recall applies to your car, the repair is free.
Take it to a Nissan dealer for the recall work specifically. An independent shop, including us, cannot perform a recall remedy.
If the warning appeared while driving, get it to the dealer without switching the car off — once it is off it may not re-enter Ready mode until the codes are read.
Report any charge-level fluctuation you have noticed, which is the exact symptom Nissan asks owners to describe.
Photograph the warning message on the dash if one appeared.

What not to do

Don't pay anyone — us included — for a battery diagnosis before you have checked the recall.
Don't have the code cleared. Past status still counts toward the remedy, but a cleared code with no freeze-frame data makes the claim harder to support.
Don't assume a “power reduced” message will clear itself.
Don't switch the car off and on repeatedly to see if it clears, if it has already warned you while driving.

When towing or urgent service is appropriate

Tow it if the car has already failed to re-enter Ready mode, or if it warned you while driving and you have switched it off. Front wheels off the ground or flatbed only, power switch off first — never with the front wheels rolling on the road. If it is still driving normally and the dealer is close, Nissan's own recall instruction is to return to the dealership without turning the vehicle off.

Not sure which category you're in? Call 623-323-0737 and describe what the car is doing. That call is free and it might save you a tow — or a much bigger repair.

Do not replace parts based on a code alone

Do not replace parts based on a code alone. A diagnostic trouble code tells you which circuit or system reported a problem — it does not identify which component failed. The same code can be set by several different faults, and clearing it without a diagnosis just hides the evidence. This page is educational; your vehicle needs its own inspection before any repair decision.

P33ED — common questions

Is P33ED the LEAF recall code?

Yes. On 2019–2022 LEAFs it is the code that converts the recall from a software update into a high-voltage battery replacement at Nissan's cost. Check your VIN at nhtsa.gov/recalls.

Does a code that was already cleared still count?

The recall wording covers P33ED stored as current or past, so yes. That is also the reason not to let anyone clear it before the dealer sees it.

Can one module be replaced instead of the whole pack?

The service manual procedure is to identify the faulty cell and replace the corresponding module. Under the recall, a stored P33ED means Nissan replaces the whole battery, at their cost. Those are two different answers and which one applies to you depends on your VIN.

My LEAF says Service EV System and won't restart. Is this it?

It may be. P33ED is one of the codes behind that message. Don't switch it off again, and get it to a Nissan dealer with the recall in mind.

Why would you tell me to go to the dealer instead of selling me a battery?

Because if your car is covered, the dealer does it for nothing and we would be charging you for a repair you are entitled to free. If it turns out your VIN is not covered, come back to us and we will price it properly.

Get P33ED diagnosed properly

Tell us the code, the year and model, and what the car is doing. We'll tell you what we'd check — and we won't quote a repair from a code.

Not sure what your hybrid needs? We'll work it out with you.

We come to you, test the pack, the 12V and the cooling, and you get a written quote before anything is decided. No obligation.

Call 623-323-0737 Text us Schedule a repair