# P0172 on the 2011 Buick Regal

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0172

- [11032947](https://open.wenmarpro.com/bulletins/11032947), 2026-05-28: This document provides the technician with a diagnostic tip if the vehicle stalls and set diagnostic trouble code P0191 and may also set P0172. The diagnostic tip has the technician inspect the high pressure fuel pump body markings to confirm it is an original manufacture part. If it is not an original manufacture part, they should install one and evaluate the vehicle.
- [10114215](https://open.wenmarpro.com/bulletins/10114215), 2017-08-15: 12313B \- Special Coverage \(revised warranty information\). The chrome layer on the balance chain pins may wear, allowing the chain to stretch. This would cause an engine noise, and if left untreated, could cause the chain to break, leading to engine damage. In addition, the fuel pump plunger shaft seal may wear and allow fuel to leak into the crankcase, setting a P0172 DTC, and illuminating the Malfunction Indicator Light. This can cause engine run\-on and/or the engine to run rough. If this condition occurs within the stated terms, dealers will replace the engine balance chain and the fuel pump.
- [10114189](https://open.wenmarpro.com/bulletins/10114189), 2017-08-15: 12313A \- Special Coverage \(revised part information\). The chrome layer on the balance chain pins may wear, allowing the chain to stretch. This would cause an engine noise, and if left untreated, could cause the chain to break, leading to engine damage. In addition, the fuel pump plunger shaft seal may wear and allow fuel to leak into the crankcase, setting P0172 DTC, and illuminating the Malfunction Indicator Light. This can cause engine run\-on and/or the engine to run rough. If this condition occurs within the stated terms, dealers will replace the engine balance chain and fuel pump.
- [10114182](https://open.wenmarpro.com/bulletins/10114182), 2017-08-15: 12313 \- Special Coverage. The chrome layer on the balance chain pins may wear, allowing the chain to stretch. This would cause an engine noise, and if left untreated, could cause the chain to break, leading to engine damage. In addition, the fuel pump plunger shaft seal may wear and allow fuel to leak into the crankcase, setting P0172 DTC, and illuminating the Malfunction Indicator Light. This can cause engine run\-on and/or the engine to run rough. If this condition occurs within the stated terms, dealers will replace the engine balance chain and fuel pump.