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Home›Trouble codes›P0556› Ram
Diagnostic trouble code · Ram

P0556 on Ram vehicles

P0556 is named on 5 Ram model years (2017–2021): 4 manufacturer filings and 1 owner report in NHTSA’s files, across ProMaster.

Powertrain 5 model years 4 manufacturer filings 1 owner report

Which Ram model years name P0556

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2021 Ram ProMasterService Brakes—1
2020 Ram ProMasterService Brakes1—
2019 Ram ProMasterPower Train1—
2018 Ram ProMasterPower Train1—
2017 Ram ProMasterPower Train1—

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Power Train 3 Service Brakes 2
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What Ram owners said

Source: NHTSA complaint database

Owners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.

The dealer performed diagnostics and made two repairs based on generated codes (C1223-68 & P0556)
2021 Ram ProMaster Aug 24, 2021 NHTSA owner report

Ram filings that name P0556

Source: NHTSA manufacturer communications

Bulletins and campaigns Ram filed with NHTSA whose summary names P0556. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What P0556 means

Source: SAE J2012 / OBD-II

P0556 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.

A stored code names the test that failed, never the part that caused it. The record above is what Ram and its owners have filed about it; the code’s page across every make has the whole file.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

Common questions

Source: NHTSA files and the OBD-II standard

Is P0556 a known problem on Ram vehicles?

It is a documented one: NHTSA's files hold 4 manufacturer filings and 1 owner report naming P0556 on 5 Ram model years (2017–2021). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.

Which Ram models does P0556 appear on most?

2021 ProMaster (1 document), 2020 ProMaster (1 document), 2019 ProMaster (1 document).

Does P0556 on a Ram mean it is recalled?

No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.

Where to go next

pages beside this code
Filed alongside P0463 Another code that appears in the same filings and owner reports as P0556.Filed alongside P11AD Another code that appears in the same filings and owner reports as P0556.Vehicle 2021 Ram ProMaster The model year P0556 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.