P12A6 on Chevrolet vehicles
P12A6 is named on 31 Chevrolet model years (2017–2023): 285 manufacturer filings and 3 owner reports in NHTSA’s files, across Silverado, Equinox, Malibu, Silverado 2500HD, Suburban and 6 more.
Which Chevrolet model years name P12A6
Source: NHTSA manufacturer communications and complaintsA 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.
What Chevrolet owners said
Source: NHTSA complaint databaseOwners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.
Check 4x4, check DEF( def is still at half full), check trailer( no trailer is connected) Took to dealership, 4 active codes P0336, P12A6, U029D, U029E
The engine light has come on 3 times with a truck with only 9000 miles on it I took it to the dealership who gave me a code of P12A6 they told me Chevrolet is aware of this problem but has not come up with solution yet or even wrote a…
Chevrolet filings that name P12A6
Source: NHTSA manufacturer communicationsBulletins and campaigns Chevrolet filed with NHTSA whose summary names P12A6. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIP5719B Service bulletin2020-04-27 · Engine And Engine Cooling
- This Preliminary information communicates the possibility of dtc P12A6 with the possibility of a crank no start or extended crank concern.
- PIP5733 Service bulletin2020-06-11 · Engine
- This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
- PIP5719A Service bulletin2020-04-17 · Engine And Engine Cooling
- This Preliminary information communicates the possibility of dtc P12A6 with the possibility of a crank no start or extended crank concern.
- PIP5733A Service bulletin2020-07-29 · Electrical System
- This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
- PIP5733B Service bulletin2020-08-06 · Engine
- This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
- PIP5733C Service bulletin2020-08-27 · Engine
- This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
- PIP5733D Service bulletin2020-09-22 · Engine And Engine Cooling
- This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
- 20NA218 Service bulletin2021-04-23 · Power Train
- This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
- 20NA218 Service bulletin2021-05-07 · Engine And Engine Cooling
- This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
- 20NA218 Service bulletin2021-05-07 · Electrical System
- This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
- PIT6396 Service bulletin2025-06-11 · Unknown Or Other
- This PI communicates an issue with a SES MIL with DTC P2535, P12A6, P10DA and/or C111B maybe set after replacing the fuel pump driver module. Engineering is working on a fix, but in the meantime, dealers are to install a diode.
- PIT6396A Service bulletin2025-08-05 · Unknown Or Other
- This PI communicates an issue with a SES MIL with DTC P2535, P12A6, P10DA and/or C111B maybe set after replacing the fuel pump driver module. Engineering is working on a fix, but in the meantime, dealers are to install a diode.
What P12A6 means
Source: SAE J2012 / OBD-IIP12A6 is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
A stored code names the test that failed, never the part that caused it. The record above is what Chevrolet 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 P12A6 a known problem on Chevrolet vehicles?
It is a documented one: NHTSA's files hold 285 manufacturer filings and 3 owner reports naming P12A6 on 31 Chevrolet model years (2017–2023). 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 Chevrolet models does P12A6 appear on most?
2020 Silverado (24 documents), 2019 Silverado (20 documents), 2020 Equinox (19 documents).
Does P12A6 on a Chevrolet 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.