MODE 01 · PID 0B

Intake manifold absolute pressure

MAP is absolute pressure. A gauge boost value uses atmospheric pressure as its reference; the two values are not interchangeable.

Formula
A
Data bytes
1
Units
kPa

A worked decoding example

Request: 01 0B

Response: 41 0B 64

Data: 64 → 100 kPa

The example shows service, PID and data only. It omits adapter headers, CAN identifier, length and padding. It is not a live vehicle reading.

Reading context

At key-on with the engine off, compare MAP with a separately observed local atmospheric pressure. Altitude affects that comparison.

A decoded value is a measurement, not a diagnosis. Encoding limits are not normal operating limits. Confirm vehicle support and the manufacturer’s procedure.

Byte decoder

Your input stays in this browser.MODE 01

FormulaA → kPa

A decoded value is a measurement, not a diagnosis. Encoding limits are not normal operating limits. Confirm vehicle support and the manufacturer’s procedure.

Sources

  1. python-OBD: Mode 01 command table ↗
  2. python-OBD: byte decoding implementation ↗
  3. CSS Electronics: OBD-II PID and response frames ↗
  4. California BAR: OBD test reference ↗

Independent reference; no affiliation with SAE, vehicle manufacturers or regulators. Sources checked 28 October 2026.