PowertrainP056300

Caution

Severity: Caution - get it checked when you can

System Voltage High

6 brands affected · Description from Mercedes-Benz data.

Key terms: Powertrain: engine, transmission and emissions

Safety: This code relates to the charging system. The battery may go flat and the car may stall.

1What it means in plain English

This range covers vehicle speed, idle and oil-pressure control, charging-system voltage, and brake-switch circuits.

2Common causes

Carbon build-up in the throttle body
Faulty idle air control valve
Faulty vehicle speed sensor
Faulty charging system or weak battery
Wiring or connector fault

3Can I drive?

Caution · drive with care

The electrical system may fail and the battery may go flat, risking a stall. If the battery or charging warning light is on, drive straight to a workshop.

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 6

Brand	Code	Description	System
Mercedes-Benz	P056300	System Voltage High Brand	Powertrain
Hyundai	P056300	is set when battery voltage above 18V is detected for more than 830 sec. Check alternator component. (overcharging of alternator) ECM senses battery voltage as monitoring the voltages in ECM(CDD-K)connector terminal 1,3,5 which are transmitted from main relay Brand	Powertrain
Sprinter	P056300	No description available	Powertrain
SsangYong	P056300	High TCU supply voltage(kl. 87) Brand	Powertrain
Volvo	P056300	No description available	Powertrain
Volkswagen	P056300	Address 80, DTC memory entry Brand	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.

5Related codes

Browse Pxxx codes or P056xx codes.