Low voltage to ecu , trouble code

When you disconnect the battery, you need to reset the security and immobilizer.

https://www.google.com/search?q=2003+Peugeot+307+cc+2.0+reset+security

Peugeot 307 P1621 Engine Trouble Code

http://p1621.enginetroublecode.com > peugeot-307
P1621 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input. Reason For P1621 Code. The reason of P1621 OBD-II Engine Trouble Code is Fuel ...

P1621 and clogged DPF - Peugeot Forums

https://www.peugeotforums.com > threads > p1621-and...
Mar 26, 2021 - Hi there. I've been having some issues with my otherwise lovely 2012 Peugeot 5008 (1.6) lately. The engine-light comes on aswell as the esp ...

Peugeot 3008 Sid807 dtc p1621 after mod - MHH AUTO

https://mhhauto.com > Thread-Peugeot-3008-Sid807-dt...
Jan 24, 2019 - Today I've took the car to dealer and he says after update car still the same. Anyone know what I can try to do now? Dtc p1621 is Inchoerence ...
4 posts · Hello.maybe someone can help me. I've sid807 for fap remove. Opened ecu, read backup by pcmflash ...
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Kerry, you can't just disconnect the battery to fix things. Yes it clears the code from the computer memory, but can do damage.

You need an auto electrician with a pro grade scan took computer to read the Diagnostic Trouble Codes and the codes tell you the fix.

It is a known issue

https://www.google.com/search?q=2008+Toyota+Rav4++VSC%2C+and+Traction+Control+light+on

Diagnostic Trouble Code Chart - Toyota RAV4 Repair

https://www.toyotaguru.us > rav4-repair-2 > diagnostic-...
Jun 3, 2022 - Diagnostic Trouble Code Chart ; P0137. Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2). - Open in HO2 sensor (sensor 2) circuit. - HO2 sensor ...


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Have you tested the starter?

Is your battery down voltage? How fast is it cranking, engine ecu will shut down if voltage is low... Otherwise need more info to help you...

Error Code: P3030
Description: Disconnection between battery and ECU.
The battery ECU monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery ECU and the wire harness between each battery block and battery ECU. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery ECU judges that there is an open in the internal sensor circuit(s) or wire harness. The battery ECU then illuminates the MIL and sets a DTC (Diagnostic Trouble Code).
Trouble Area:
- Junction Block Assembly (Bus Bar Module).
- Frame wire number 2, (Bus Bar and wire harness).
- Battery ECU.

you cannot get this sort of information its like proverbal rocking horse brown stuff ,dont want people like me doing repairs that the dealer wants ------- what sort of amperage are you drawing ,as i suspect either a low reserve amperage battery in your terms its sulphated up and need renewing or the alternator diode pack has a diode breaking down .Trust me you test a battery with a voltmeter ,only test for a battery is a drop tester ,your car will draw power when not used ,anything from clock to alarm and radio memory ,so check the battery with a drop tester as i think this is your problem

Hi

Thanks for using FixYa. First of all you’ll need to check battery voltage, recharge it if it is low or jump start with another battery charger. Inspect, clean and tight both ends of all battery cables. Also check, clean and tight wiring connections. Check for voltage at relay. If relay has voltage but there is no "click" when key is turned to start, replace relay. Remove starter and inspect drive gear and flywheel teeth, replace damaged parts if necessary. Check to see if voltage reaches starter relay/solenoid when turn to start. If not, check for open P/N switch and brake or clutch pedal switch. Please pry the interior panel and release the inside door locks. If still the issue is not resolved then you’ll need to drill a two inch hole into the latch to access the inside lock link through the interior panel. After removing the panel replaces the latch to resolve the issue. See the picture where to drill---

Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks
Rylee

DTC 9318 is a fault code for incorrect battery voltage. If the ecu is reading low battery voltage then regardless of what is happening at the battery or the alternator, the ecu will be undervoltage and all the readings from the sensors will likely to be misinterpreted. The othe codes are related to the voltage code. Inspect the battery connections and the TPS since that also controls the voltage regulator through the ECM. The other thing that can cause the drain to your battery is the battery it self, if it's past 5 years. The battery may have got to the end of it's life and needs to be replaced casue it can no longer hold a charge. The other common battery drain is the rear wiper motor, if the wiper was used. It's common for the wiper regulator may be worn and when the wipers are turned off and the wipers are in the down positon. The regulator may not regester that the wiper is where it should be and will keep the power on to try to bring it where it should be when off. This will drain the battery, try removing the fuse to the wipers over night and see if you still have the battery drain to check if it's and wiper moter or not. Good luck and hope this helps, but i am leaning towards a new battery if it's been in there for over 4 years.

While your car is running, measure the voltage at your battery terminals. If the alternator is wotking, it should measure over 13 volts, since the battery is really low. On a healthy battey the voltage is around 14.5 volts when the engine is running. If the car is running and you measured 12.6 volts or less, change the alternator. I have actually worked on a lexus ls400 with exact same problem. I had rebuilt the alternator myself to save the customer on parts. Because altenator is not cheap on lexus. There is an ace hardware by my shop where they carried some carbon brush, all you got to do is file it down to fit, and solder them. Of course you have to open the alternator to do that. The brushes cost about a few bucks. You can buy these at auto parts too but not for that particular alternator. Auto parts like to make money and would rather sell you the whole thing. LOL

get a boost... sounds like the battery is run down.... if you want to test that theory... have someone try and start the car while you check hte voltage on the battery.... it may well even need replacement

Robert