P2138 on Buick vehicles The two accelerator pedal position sensors disagree with each other
P2138 is named on 14 Buick model years (2016–2018): 23 manufacturer filings and 2 owner reports in NHTSA’s files, across LaCrosse, Regal, Encore, Cascada, Enclave and 2 more.
Which Buick model years name P2138
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2018 Buick LaCrosse | Vehicle Speed Control | 4 | — |
| 2018 Buick Regal | Engine | 4 | — |
| 2017 Buick LaCrosse | Electrical System | 4 | — |
| 2018 Buick Encore | Electrical System | 1 | 1 |
| 2017 Buick Encore | Engine | 1 | 1 |
| 2018 Buick Cascada | Engine | 1 | — |
| 2018 Buick Envision | Electrical System | 1 | — |
| 2017 Buick Cascada | Engine | 1 | — |
| 2017 Buick Enclave | Engine | 1 | — |
| 2017 Buick Verano | Electrical System | 1 | — |
| 2016 Buick Cascada | Engine | 1 | — |
| 2016 Buick Enclave | Engine | 1 | — |
| 2016 Buick Encore | Engine | 1 | — |
| 2016 Buick Verano | Engine | 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.
Buick filings that name P2138
Source: NHTSA manufacturer communicationsBulletins and campaigns Buick filed with NHTSA whose summary names P2138. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 070604019F Service bulletin2017-11-17 · Engine
- This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power displayed and DTC P2138 set.
- N182188250 Service bulletin2019-08-15 · Vehicle Speed Control — Accelerator Pedal
- Certain 2016-2018 model year Chevrolet Malibu, 2017-2018 model year Buick LaCrosse, and 2018 model year Buick Regal vehicles may have a condition which affects the electrical connection to one of the vehicle?s accelerator pedal position sensors. If this electrical connection is interrupted, the accelerator pedal will still function, but the vehicle will enter a reduced engine power mode in which
- N182188250 02 Service bulletin2020-06-19 · Vehicle Speed Control — Accelerator Pedal
- Special Coverage Adjustment - Certain 2016-2018 model year Chevrolet Malibu, 2017-2018 model year Buick LaCrosse, and 2018 model year Buick Regal vehicles may have a condition which affects the electrical connection to one of the vehicle?s accelerator pedal position sensors. If this electrical connection is interrupted, the accelerator pedal will still function, but the vehicle will enter a reduc
What P2138 means
Source: SAE J2012 / OBD-IIThe two accelerator pedal position sensors disagree with each other.
A stored code names the test that failed, never the part that caused it. The record above is what Buick 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 P2138 a known problem on Buick vehicles?
It is a documented one: NHTSA's files hold 23 manufacturer filings and 2 owner reports naming P2138 on 14 Buick model years (2016–2018). 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 Buick models does P2138 appear on most?
2018 LaCrosse (4 documents), 2017 LaCrosse (4 documents), 2018 Regal (4 documents).
Does P2138 on a Buick 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.