Auxiliatary battery malfunction message - 2010 Mercedes-Benz ML 350

Your alternator is not putting out enough power to recharge your battery.. Your battery will eventually drain.

It could be a lot of thing's ,define lost power ! Engine died an the light's lit on the instrument cluster ? Does the engine spin when you turn the key to start ? Did the malfunction light come on when the engine was running ? Do the headlamps work , shine bright ? Battery good , connections good ? What year is the vehicle ? Engine Ztec ?

Definition of Diagnostic Trouble Code P1400 Audi: EGR Valve Circ Electrical Malfunction BMW: Heated Catalyst Battery Voltage or Current too Low during Heating (Bank 1) Chrysler: Manifold Differential Pressure Sensor Circuit Malfunction Dodge: Manifold Differential Pressure Sensor Circuit Malfunction Ford: Differential Pressure Feedback EGR Circuit Low Input Hyundai: EGR System Monitor Malfunction Infiniti: EGRC Solenoid/V Jaguar: Exhaust Gas Recirculation Valve Position Control Jeep: Manifold Differential Pressure Sensor Circuit Malfunction Lexus: Sub-TPS Malfunction Lincoln: Differential Pressure Feedback EGR Circuit Low Input Mazda: DPFE Sensor Circuit Low Input Mercedes: EGR Switchover Valve Malfunction (C230 Only) Mercury: Differential Pressure Feedback EGR Circuit Low Input Mitsubishi: Manifold Differential Pressure Sensor Circuit Malfunction Nissan: Differential Pressure Feedback EGR Circuit Low Input Subaru: Fuel Tank Pressure Control Solenoid Circuit Low Input Toyota: Sub-Throttle Position Sensor Malfunction Volkswagen: EGR Valve Circ Electrical Malfunction

Batteries that are on the way out will give false malfunction signals. Replace your battery before doing anything else.

first place to check is the battery in the fob key. Check for charge as it may be below required voltage to work.

Try using another battery or assisted battery connected from another vechile as batteries just die. If the battery is malfunctioning then the error messages are shown.

it is likely the large battery in the boot that has weakened, if after driving car for some time when you restart the message disappears.

It sounds like the voltage regulator is malfunctioned but hasn't went completely bad. It has a built in regulator unlike the old cars. Also check all your connections from the battery to the starter solenoid and back down to the starter.

This time of year alot of batteries fail because of the cold but a bad battery will not turn on the charging light. This usually only occurs when the alternator isnt charging. When the battery drains enough its possible thats why you have these other issues.
Codes only set when the computer does not see the correct voltages

Hi,

Just had same problem this morning. I had noticed that the satnav was malfunctioning (i.e. developed a mind of its own!!) a couple of days ago and then this morning PSM/ABS failure......marvellous!! Anyway, simply disconnected battery, waited 10-15 mins, reconnected battery and hey presto my boxster fired up. However the PSM failure message still showed, so took it for a spin around the block and the message disappeared and, touch wood, everything seems back to normal. I think it must have been a battery problem, so just to safe I am going to get a new battery and hopefully I can look forward to years of trouble free motoring.....one day with the roof down!!!! (Where has the sunshine gone!!!????)