Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Sun Mar 21, 2021 11:12 am

When I try to charge the car using slow charging, some relay clicks at the rear. Then relay clicks again and charging stops + green triangle.
When key is in ON position and is turned to start position, one relay clicks under the instrument cluster.

For 12V baterry charging I use this charger: https://www.victronenergy.com/chargers/blue-smart-ip65-charger

For error checking and deleting I use icarSoft 1st generation OBD scanner. Do not have much experience with it.
I tried to go through various menu and found P1A15 error and additionally these error codes:
ETACS module: U1111 - Display CAN timeout/not equipped
Meter module: U1116 - KOS CAN timeout/not equipped
OCM module: B1691- Occupant sensing antenna
Comp&htr module: U111C - BMU CAN Timeout

Some data I was able to get:
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In different modules I get different 12V battery voltage:
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BlindMoose
Posts: 2
Joined: Sat Dec 02, 2017 9:00 am

Re: Not able to drive. P1A15 error.

Thu Apr 08, 2021 1:09 pm

Amazingly, we are suffering the same problem, at the moment. During lockdown the car has been left for 2 to 3 months, with traction battery at about half charge, and the 12v auxiliary battery removed. So charged the auxiliary battery, plonked it back in the car, and drove it round the block, to 'free off' the brake shoes & pads. Came back, turned it off, went for a cup of tea. Went back out to the car, to pop down the road, and bingo. The car won't go into ready. So bought a new 12v auxiliary, and no change. Ran a diagnostic, got the P1A15, and timeout errors. Cleared the errors, and the car went into ready. Drove the car over to put it on charge, turned it off, put charger on, and went back to error state. red 12v battery sign, and yellow exclamation thro car. So I thought that the fault was the DC to DC charger. Checked all the fuses ( including the 20A) in the MCU. Tried to clear the codes, but the car stubbornly won't leave the error status or go into ready, and has been like this for a couple of weeks. Spent many hours now trawling through other sites to see if anyone has cured this, but to no avail. However I have just found an obscure mention that the problem may well be with the BMU. Apparently this unit has an eprom that learns the state of the batteries. It states that 'IF THE AUXILIARY IS REMOVED FOR MORE THAN A MONTH, A BMU LEARNING VALUE MUST BE RE-WRITTEN INTO THE EPROM' So, maybe that means the BMU is now throwing up the fault, because it doesn't know the battery status. Hopefully, if I can lay my hands on a decent MUT type reader, I might be able to upload to the Eprom. Next week, and see if that works.

Gencis
Posts: 55
Joined: Fri May 04, 2018 2:45 am

Re: Not able to drive. P1A15 error.

Fri Apr 09, 2021 9:29 pm

To BlindMoose: thank you for sharing this information. My car was left without 12V battery max for a week time. But it would be also worth checking EPROM. Please inform how you succeed and what took you used

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