P2138 on Cadillac vehicles The two accelerator pedal position sensors disagree with each other
P2138 is named on 5 Cadillac model years (2016–2018): 5 manufacturer filings and 0 owner reports in NHTSA’s files, across CT6, SRX, XTS.
Which Cadillac model years name P2138
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2018 Cadillac CT6 | Electrical System | 1 | — |
| 2018 Cadillac XTS | Electrical System | 1 | — |
| 2017 Cadillac XTS | Engine | 1 | — |
| 2016 Cadillac SRX | Engine | 1 | — |
| 2016 Cadillac XTS | 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.
Cadillac filings that name P2138
Source: NHTSA manufacturer communicationsBulletins and campaigns Cadillac 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 · Electrical System
- 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.
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 Cadillac 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 Cadillac vehicles?
It is a documented one: NHTSA's files hold 5 manufacturer filings and 0 owner reports naming P2138 on 5 Cadillac 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 Cadillac models does P2138 appear on most?
2018 CT6 (1 document), 2016 SRX (1 document), 2018 XTS (1 document).
Does P2138 on a Cadillac 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.