P2282

Code

Generic P — Powertrain

Air Leak Between Throttle Body and Intake Valves

Brand: Generic

Type: P — Powertrain

Views: UK: 37 EN: 167 RU: 62

AI status

Completed

ready

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Page language: EN

Causes

Damaged or improperly seated intake manifold/throttle body gasket
Loose or missing throttle body or intake manifold bolts
Cracked intake manifold or plenum between throttle body and intake runners
Disconnected, cracked or degraded vacuum/PCV hoses downstream of the throttle body
Failed PCV valve or valve cover gasket leak
Warped or contaminated throttle body mating surface

Symptoms

Check Engine Light (CEL) set, often with P2282 and/or lean codes
High or unstable idle, rough idle
Hesitation or stumble on acceleration
Increased fuel consumption or poor driveability
Hard starting or stalling after startup
Audible hissing or whistling vacuum leak noise

What to check

Read stored codes and freeze frame data with a scan tool
Monitor long-term and short-term fuel trims, MAF and MAP sensor readings, and O2 sensor voltages during idle and revs
Visually inspect throttle body-to-intake gasket area for loose bolts, damaged gasket or obvious cracks
Inspect all vacuum and PCV hoses downstream of throttle body for disconnection, cracks or deterioration
Perform a smoke test (preferred) to locate leaks in intake plenum and gasket area
Use a hand-held vacuum pump or vacuum gauge to check intake vacuum at idle for abnormalities

Signal parameters

Short-term fuel trim (STFT) and long-term fuel trim (LTFT) — lean bias downstream of throttle body
MAF sensor airflow vs commanded airflow
MAP/intake manifold absolute pressure relative to RPM and throttle position
O2 sensor voltages and switching rates
Intake air temperature (IAT) vs expected values if air intrusion is outside sensor location
Misfire counters and cylinder balance data

Diagnostic algorithm

Read and record DTCs and freeze frame data; note engine conditions when fault set.
With a scan tool, monitor MAF, MAP, STFT/LTFT, O2 sensors and RPM at idle and during moderate throttle. Confirm symptoms match unmetered air downstream of MAF.
Visually inspect throttle body mounting bolts and intake manifold fasteners; ensure tightness to manufacturer specs and check for missing hardware.
Inspect throttle body and manifold mating surfaces for gasket remnants, debris, cracking or warpage. Clean surfaces if needed before detailed testing.
Inspect all vacuum/PCV hoses and valve cover gasket area for cracks, splits or disconnects. Replace any degraded hoses.
Perform a controlled smoke test of the intake tract (introduce smoke into intake upstream of throttle body and/or into intake plenum downstream as appropriate) to pinpoint leaks between throttle body and intake valves. Repair or replace leaking components.
If smoke test inconclusive, isolate sections: remove throttle body and inspect gasket and mating surface; run a pressure/vacuum test on manifold runners if possible.
After repair (gasket replacement, manifold/PCV hose repair, bolt replacement), torque components to manufacturer specifications and reassemble.
Clear codes, perform a warm-up and a road test while monitoring fuel trims and O2 sensors to confirm the leak is resolved and trims return toward nominal.
If problem persists, consider further inspection for internal intake manifold cracks, intake runner control faults, or sensor faults (MAF/MAP/TP).

Likely causes

Worn or torn throttle body-to-manifold gasket
Loose throttle body fasteners after service
Cracked intake plenum near gasket area
PCV hose disconnected or brittle and split
Failed intake manifold gasket due to age/heat cycles

Fault status

⚠️ Status

Air leak detected between throttle body and intake valves causing unmetered air entry downstream of the airflow sensing point; can cause lean fuel trims and driveability issues.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Repair manuals

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