P1464 Manufacturer-specific Basic entry

Unable To Pull Vacuum In Tank

Updated 2026-10-02 · Manufacturer-specific powertrain

Severity

Medium

Typical repair cost

60 – 500 EUR

System

Powertrain

This is a manufacturer-specific code. Its exact meaning can differ between makes; the definition below follows the most common usage.

What it means

P1464 is defined as "Unable To Pull Vacuum In Tank". the engine control module stores it when the monitored condition for this component or system is outside the limits programmed by the manufacturer.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

Check engine light on
Rough or unstable idle
Hesitation or poor acceleration
Increased fuel consumption
Possible limp mode with reduced power

Common causes

Unable To Pull Vacuum In Tank worn, contaminated or out of calibration
Mechanical problem in the system the sensor measures
Air, vacuum or exhaust leak influencing the reading
Wrong or low-quality replacement part
Wiring resistance causing a small voltage offset

How to diagnose

Compare the live Unable To Pull Vacuum In Tank reading with a known-good value or a second sensor at idle and at 2500 rpm
Check for air, vacuum or exhaust leaks that could skew the reading
Inspect the component for contamination and clean it if the design allows
Verify the part number is correct for the engine
Replace the Unable To Pull Vacuum In Tank if the reading remains out of specification

Frequently asked questions

Can I keep driving with P1464?

Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.

Will clearing P1464 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

P1462 P1463 P1465 P1466