PowertrainP123A

Caution

Severity: Caution - get it checked when you can

Barometric pressure - Turbocharger/supercharger boost correlation - Sensor A

15 brands affected · Description from Land Rover data.

Key terms: Turbocharger: an exhaust-driven fan that pushes extra air into the engine · Supercharger: an engine-driven fan that pushes extra air into the engine · Boost pressure: extra air pressure made by a turbo or supercharger · Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.

2Common causes

Sensor or actuator fault
Wiring or connector fault
Vacuum or intake leak
Fuel or ignition problem
Control module fault

3Can I drive?

Caution · drive with care

Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 15

Brand	Code	Description	System
BYD	P123A	Canister purge pressure sensor voltage too high Brand	Powertrain
Daewoo	P123A	No description available	Powertrain
DFFS	P123A	Turbine water pump idling Brand	Powertrain
DFXK	P123A	Firing order, injection end time exceeding the limit for cylinder 1 Brand	Powertrain
EOBD	P123A	Nút CAN xe NYL quá cao Brand	Powertrain
GM	P123A	No description available	Powertrain
Great Wall	P123A	Firing order, injection end time exceeding the limit for cylinder 1 Brand	Powertrain
Holden	P123A	Alternative Fuel Pump Control Circuit Brand	Powertrain
Hyundai	P123A	No description available	Powertrain
Isuzu	P123A	No description available	Powertrain
Land Rover	P123A	Barometric pressure - Turbocharger/supercharger boost correlation - Sensor A Brand	Powertrain
Opel	P123A	No description available	Powertrain
Peugeot	P123A	No description available	Powertrain
Porsche	P123A	EV4 (alt) Fehlbedatung Brand	Powertrain
Saab	P123A	No description available	Powertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Extended variant codes 2

These 7-character codes are manufacturer-specific variants of P123A and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P123A00	Ladedruckregelung, bleibende negative Regelabweichung zu groß Brand	Powertrain
Sprinter	P123A00	Ladedruckregelung, bleibende negative Regelabweichung zu groß Brand	Powertrain

6Related codes

Browse Pxxx codes or P123xx codes.