Justins17c43

Hey guys, so I purchased a jb4 second hand, followed the install instructions and did a lot of research but not finding the answers to my questions so hopefully you guys can help.
first I got a check engine light and a code p0238 and it won’t clear through the app

next I took it for a drive last night and tried map 0 and map 1 and both are very slow. I’m not sure if I have to download new maps or if they’re saved from the previous person or if it’s my check engine light giving the problem? Any suggestions help

MaverickC43

I know another member had a bad board in his and it was like driving the car with no boost. His was new and bms got him new unit.
I can’t help much more than that but others prob can

Justins17c43

So update. Tried unhooking the battery hoping it would reset, still had the check engine light and no power I then disconnected the whole thing and tucked it. Then took my reader and cleared the code. Car runs fine now but need to see what I’m doing wrong

RichardCranium3

I’d bet you have a connection wrong, or not fully seated somewhere. This happened to me once after removing for dealer visit and reinstall afterwards. I’d uninstall, drive to confirm normalcy, then start fresh again.

Justins17c43

So I unhooked the battery kept the key away and hooked everything back up. No check check engine light but still no power. It’s not boosting at all and I feel like an idiot but thought I’d have at least stock power while running it. Any ideas?

Howyalivin

If it's not boosting at all, there's another issue. Potentially inside of the JB4, but more likely elsewhere. Map 0 is a passthrough; the car should perform exactly the same as stock. It's not user modifiable. If you're not getting boost in Map 0, but do when the JB4 is disconnected, you either have a problem with your connectors/connections, or you were sold a faulty JB4. Map 1 is slightly above stock, and so on up the line, until Map 6, where you do whatever user-customized tune you want. Might want to get your money back from the guy you bought it from if you're able. If not, give Burger Tuning a call.

Here's a reference for the different JB4 maps on the C43:

JB4 Map Guide as of v6 firmware:
Map 0: Disables tuner
Map 1: Up to 4psi over stock peak, suitable for all 91 octane+ fuels
Map 2: Up to 5psi over stock peak, suggested for 93octane+
Map 3: Up to 5.5psi over stock peak, slightly more aggressive version of map2
Map 4: Up to 6psi over stock peak, suggested for E30+ or unleaded race gas mixtures
Map 5: Up to 7psi over stock peak, holding more boost to redline, suggested for E30+ or unleaded race gas mixtures
Map 6: User definable map, boost over stock entered on user adjustment page
Map 7: WMI (water/meth injection) progressive map for BMS FSB integration
Map 8: Low boost VALET map

Justins17c43

Got with my local speed shop and got it figured out. Running perfect now, appreciate all the input

BMS

Next time if you need support email us, support@burgertuning.com. We don't check the forum daily so you could be waiting awhile if you just ask here.

Low_roman

What was the actual fix. I'm running into the same issue with a second hand jb4

Justins17c43

Hey man I'm going to inbox you my cell it's a lot to type but it's a pretty easy fix and my car is running perfect now

tsobash

Hey! Just sent you a message wondering about your JB4 fix.

MaverickC43

Anyone in the Chicago land area??

hitlos

Hi Justin,

Could you please share your fix? I'm running the same issue.