Buick Encore P1101: the LUJ/LUV and LE2 repair paths
The short answer
P1101P1101 is GM’s “Intake Air Flow System Performance” code: the intake airflow needs diagnosis.
An Encore with P1101 can fall into different GM diagnostic branches. LUJ/LUV guidance includes a PCV-pipe valve fault; LE2 guidance includes a blocked PCV orifice and excessive crankcase pressure. Match the engine RPO before applying either correction.
| Model year | Model | Engine RPO | GM bulletin / pages | Revision | Note |
|---|---|---|---|---|---|
| 2013–2017 | Encore | 1.4L LUJ / LUV | PI0907C · PDF 1–2 | 2016-10 | |
| 2013–2016 | Encore | 1.4L LUJ / LUV | PIP5197F · PDF 1–4 | 2017-08-16 | |
| 2016–2022 | Encore | 1.4L LE2 | 20-NA-047 · PDF 1–3 | 2023-01 | Confirm the fitted engine by VIN. |
Does this reference cover your vehicle?
- Model year
- 2013–2017
- Model
- Encore
- Engine RPO
- 1.4L LUJ / LUV
- GM bulletin / pages
- PI0907C · PDF 1–2
- Revision
- 2016-10
- Note
- —
- Model year
- 2013–2016
- Model
- Encore
- Engine RPO
- 1.4L LUJ / LUV
- GM bulletin / pages
- PIP5197F · PDF 1–4
- Revision
- 2017-08-16
- Note
- —
- Model year
- 2016–2022
- Model
- Encore
- Engine RPO
- 1.4L LE2
- GM bulletin / pages
- 20-NA-047 · PDF 1–3
- Revision
- 2023-01
- Note
- Confirm the fitted engine by VIN.
In this guide
LUJ/LUV: the PCV pipe is one documented cause
PI0907C specifies 8–12% throttle position at warm idle with A/C and defrost off. A reading below 7% indicates unmetered air. The bulletin identifies a PCV pipe with an open back-pressure valve at the turbo inlet; when professional isolation of that pipe restores the reading, GM calls for pipe replacement. The air-cleaner-baffle instruction in this revision is explicitly Cruze-only.
PIP5197F addresses a separate cam-cover/manifold PCV fault on its listed Encore applications. A leaking external PCV port leads to cover replacement; a missing manifold non-return valve can damage the diaphragm, and its confirmed absence means manifold replacement.
Source: PI0907C · PDF 1
LE2: positive crankcase pressure changes the repair path
20-NA-047 sets the LE2 normal range at −1 to −5 inH₂O in Park at hot idle. Pressure above 0 inH₂O needs further investigation, including intake restrictions and the PCV orifice. A blocked orifice is cleared of its obstruction and replaced as necessary, together with camshaft-cover gaskets.
The earlier LUJ/LUV normal range in PIP5197F is −11 to −18 inH₂O at hot idle in Park. That difference is why engine identification must accompany a pressure reading. The comparison is summarized in the Cruze engine-matching guide.
Source: 20-NA-047 · PDF 2 · 20-NA-047 · PDF 3
What to bring to the appointment
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Bring the engine identification, full code report and a description of any oil leak or change in idle. The useful outcome is a recorded finding tied to the matching engine branch. The Encore cold-weather guide covers a P0299 code with a complaint in extreme cold.
Source: PI0907C · PDF 1 · 20-NA-047 · PDF 1