P03B0 — Cylinder 3 - pressure variation low

Generic OBD2

Generic OBD2: P03B0

Cylinder 3 - pressure variation low

Reference namespace: obd2
Source revision: legacy-2.2.20

Generic OBD2 definition; confirm the protocol and vehicle-specific service information.

Manufacturer reference family

GM: P03B0

Cylinder 3 Pressure Variation Too Low

Reference namespace: gm
Source revision: legacy-oem-dtc-r2-20260924

Reference family assigned by the production catalog. An entry in this family is not proof of a fault or ECU support on every listed vehicle.

What should I check before using this definition?

Keep the full code, module, status and freeze-frame data. Confirm the vehicle’s make, model, year and current manufacturer service information before choosing a repair. This entry does not identify a failed part by itself.

Organize a scan report or recording

Source and applicability

OBD Lens production library legacy-owner-2026-11-02-v84-evidence. This is a scoped technical reference, not a scan of your car. A catalog relationship does not certify that every ECU, year or engine returns the same signal or code definition.

Read the reference method

What does P03B0 mean?

Cylinder 3 - pressure variation low. 2 reference families define this identifier: GM, Generic OBD2.

Is P03B0 a generic or manufacturer-specific code?

This code has a generic OBD-II prefix. Confirm the reference scope shown above.

Can P03B0 tell me which part has failed?

This entry does not identify a failed part by itself. Confirm the vehicle’s make, model, year and current manufacturer service information before choosing a repair.