tonymaloney said:

My engine management light has just come on, amber. I have just run a code reader and it has come up with this little list! The cruise control is also not working and I have just noticed when reversing that it comes up with, "restricted performance" and then picks up.
I have erased all the codes and the engine management light has gone off. Could this be just one thing or do I need to be worried?
This is on a Discovery 4 2011.

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Stanleysteamer said:

Welcome to the forum!

not an expert on the D4 but do know these vehicles are very sensitive to batteries that are not in tip top condition.
don't worry, more knowledgeable people like @gstuart will pop on soon to help you out.
By the way, what diagnostic is that? It may help us if we know.

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gstuart said:

Hi

Plus 1 what’s been mentioned about the battery from @Stanleysteamer, as if they get low can cause untold issues, , would u also let us know what software ur using plse

So indeed if all the codes have gone after clearing them, give it a short drive then rescan it to see if any come back as that will give u a better picture idea of actual current faults and not old ones

So will be a good idea to check the earth leads and clamps along with at the same time battery voltage with the engine off and then running to ensure there fully charged , don’t think u have a second aux battery fitted on ur early D4 , if the battery is older than 5 x years would be a good idea to fit a new one as that’s an average age on these vehicles as there very power hungry

If a new battery is fitted Plse ensure u reset the BMS module

Hope that helps

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tonymaloney said:

The battery this morning before starting was reading 12.2v. When started was showing 14.5v. The battery has an indicator on it and that is green which means okay. Having said that when I retested the codes with ignition on within 10 minutes a warning error came up saying battery low start engine. All the codes came back again. I tried it without starting the engine and only one came back. See attached picture. U2005-85 vehicle speed signal above allowable range. @gstuart and @Stanleysteamer

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Stanleysteamer said:

I expect @gstuart will agree with me when I say that 12.2 volts isn't enough. Normally needs to be 12.6.
But he has already talked about batt voltages and conditions.
14.5 shows the alternator is OK, I would think.
The green indicator is a very vague thing to go by, it is a bit of indication is all.
One thing you could do is jump another batt onto it and see if it behaves itself, if you have a spare batt kicking around or another car you can connect to it with jump leads.
Best of luck mate.

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tonymaloney said:

The battery this morning before starting was reading 12.2v. When started was showing 14.5v. The battery has an indicator on it and that is green which means okay. Having said that when I retested the codes with ignition on within 10 minutes a warning error came up saying battery low start engine. All the codes came back again. I tried it without starting the engine and only one came back. See attached picture. U2005-85 vehicle speed signal above allowable range. @gstuart and @Stanleysteamer

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