P0128 on Chrysler vehicles The engine is not reaching its normal operating temperature in the expected time — usually the thermostat
P0128 is named on 11 Chrysler model years (2016–2024): 20 manufacturer filings and 1 owner report in NHTSA’s files, across Pacifica, Voyager, Town and Country.
Which Chrysler model years name P0128
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2021 Chrysler Pacifica | Engine | 5 | — |
| 2020 Chrysler Pacifica | Engine | 4 | — |
| 2021 Chrysler Voyager | Engine | 3 | — |
| 2020 Chrysler Voyager | Engine | 2 | — |
| 2024 Chrysler Pacifica | Equipment | 1 | — |
| 2024 Chrysler Voyager | Equipment | 1 | — |
| 2023 Chrysler Pacifica | Equipment | 1 | — |
| 2023 Chrysler Voyager | Equipment | 1 | — |
| 2022 Chrysler Pacifica | Equipment | 1 | — |
| 2022 Chrysler Voyager | Equipment | 1 | — |
| 2016 Chrysler Town and Country | Power Train | — | 1 |
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.
Chrysler filings that name P0128
Source: NHTSA manufacturer communicationsBulletins and campaigns Chrysler filed with NHTSA whose summary names P0128. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- S2118000009 Service bulletin2021-05-24 · Engine And Engine Cooling
- Customer complains of a MIL-on condition. Upon further inspection, there is a Diagnostic Trouble Code (DTC) P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) set in the PCM.
- S2118000009 Service bulletin2021-05-24 · Engine And Engine Cooling
- Customer complains of a MIL-on condition. Upon further inspection, there is a Diagnostic Trouble Code (DTC) P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) set in the PCM.
- S2118000009 Service bulletin2021-05-24 · Engine And Engine Cooling
- Customer complains of a MIL-on condition. Upon further inspection, there is a Diagnostic Trouble Code (DTC) P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) set in the PCM.
- S2118000009 Service bulletin2021-05-24 · Engine And Engine Cooling
- Customer complains of a MIL-on condition. Upon further inspection, there is a Diagnostic Trouble Code (DTC) P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) set in the PCM.
- 9100287 Service bulletin2024-01-18 · Equipment — Electrical
- Thermostat Assy For 2022-2024MY 3.6L Pentastar Upgrade with P0128 failure code. PRIOR TO PERFORMING ANY THERMOSTAT REPLACEMENT, PROCEED WITH INSPECTION INSTRUCTIONS FROM THE LATEST VERSION OF STAR ONLINE PUBLICATION S2309000014
What P0128 means
Source: SAE J2012 / OBD-IIThe engine is not reaching its normal operating temperature in the expected time — usually the thermostat.
A stored code names the test that failed, never the part that caused it. The record above is what Chrysler and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0128 a known problem on Chrysler vehicles?
It is a documented one: NHTSA's files hold 20 manufacturer filings and 1 owner report naming P0128 on 11 Chrysler model years (2016–2024). 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 Chrysler models does P0128 appear on most?
2021 Pacifica (5 documents), 2020 Pacifica (4 documents), 2021 Voyager (3 documents).
Does P0128 on a Chrysler 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.