Impala/Malibu brake-vacuum codes: revised pipe requires matching cap and connector. See the manufacturer document, vehicle conditions, exclusions and questions for a qualified shop before assuming a repair.
This is a research summary of a manufacturer communication, not a diagnosis for your car, a DIY repair procedure or confirmation of warranty or recall eligibility. No qualified technician has approved a repair for your individual vehicle here.
This historical communication is conditional. The current revision, VIN/build eligibility, measured diagnosis and any warranty or recall decision are not established here. Ask the manufacturer or a qualified shop to check the complete current document.
Read the General Motors original: Impala/Malibu brake vacuum pipe revision · Check open recalls by VIN at NHTSA Source date: 2022-10; research checked: 2026-11-01.
What prompted this manufacturer document
- One or more listed brake-vacuum-related codes
- Original pipe routing may contribute. The revised pipe installation includes the specified cap and connector changes, followed by scan-tool vacuum verification.
Which vehicle conditions must be checked
Each row below retains its own conditions. Do not combine engines, years or models across rows to create new applications. A listed model is not proof that a particular VIN is affected.
- Chevrolet Impala · 2014, 2015, 2016, 2017, 2018, 2019 · 2.5L; LCV/LKW grouped in source; gasoline
- Chevrolet Malibu · 2014, 2015, 2016, 2017, 2018, 2019 · 2.5L; LCV/LKW grouped in source; gasoline
Codes recorded in this document
A root listed only as an appearance has no separately verified meaning here. Preserve every suffix and module name; a shared root does not transfer a repair branch to another vehicle.
| Root | Raw form | Meaning in this source, if established |
|---|---|---|
| C025E | C025E | Brake-booster vacuum sensor circuit concern |
| C0299 | C0299 | Large leak detected in brake-booster vacuum |
| P050F | P050F | Insufficient brake-booster vacuum |
| P0556 | P0556 | Brake-booster pressure-sensor performance |
| P0557 | P0557 | Brake-booster pressure-sensor circuit voltage low |
| P0558 | P0558 | Brake-booster pressure-sensor circuit voltage high |
| P0561 | P0561 | System-voltage performance in this bulletin |
What an owner can record safely
- Whether brake pedal effort or stopping performance changed
- Saved chassis and powertrain codes
- Prior vacuum-pipe replacement
Editorial safety boundary for this system
Stop and arrange help for abnormal brake effort or stopping. Do not road-test degraded brakes.
- Use current model-specific service information, calibrated equipment and a qualified technician for the selected diagnostic branch.
- Do not disconnect vacuum lines, defeat brake warnings or treat a sensor code as safe-to-drive clearance.
This is a conservative editorial policy, not a manufacturer safe-to-drive decision for a specific vehicle.
What the source does not prove
- The source lists P0561 among these codes; do not silently rename it as a vacuum-specific code or sell only the pipe as a complete universal repair.
- A code or message alone does not establish a failed part, a safe-to-drive decision or an approved repair for this VIN.
- A service bulletin is not automatically a recall or free warranty repair. Confirm current eligibility directly.
Questions for the repair shop
- Which current manufacturer procedure, VIN/RPO/build gate and test result determine the diagnostic branch?
- Does a later revision or a current recall change the source's original advice?
- What measurement or inspection confirms the cause, and how will the repair be verified?
Open source-review issue
- Q3-10: Shared engine/RPO columns cover several model rows. Never produce a Cartesian product of every engine and every year/model. Verify VIN/RPO pairing first.
The uncertain field is not used here to claim a current fitment, repair or market-wide failure.
Read the original record
The linked communication may be revised after the research date. Compare its document number, exact vehicle table, diagnostic preconditions and exclusions with a qualified technician. This page paraphrases selected facts and does not reproduce the manufacturer procedure.
Sources and scope
- General Motors — Impala/Malibu brake vacuum pipe revision (21-NA-045) Document: 2022-10 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.