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Old 09-17-2016, 01:34 PM   #1
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Seneca Won't Start - 'BH33 No Trans Error'?

Last week I decided to start up the Seneca just because it had been setting for a while. Turned the key and got all of the normal startup lights but when I went to crank it over - nothing happened. Instead I get a BH33 No Trans on the display. I had the motorhome levelers down so I thought maybe it wouldn't start with them down for a safety reason so I raised them and still no start. Later on in the day I went back out to troubleshoot and it fired right up but I got a check engine light. The Scangauge gave me the error code but it was one that was not listed in any of the Freightliner docs that I could find (skipped right over that number) . It started and ran fine though so I put it off for another day.

Well today I needed to move the motorhome and, naturally, the same thing happened. "BH33 No Trans" and it will not start. Levelers are up so it is not that again.


I found a chart here that seems to indicate a BH33 fault is related to the cigar lighter?? That does not seem serious enough to cause a no-start.

http://ww2.justanswer.com/uploads/Cl...18_sb54177.pdf

Any idea what this could be?
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Old 09-17-2016, 01:41 PM   #2
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does it have a remote start
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Old 09-17-2016, 02:32 PM   #3
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Bulkhead Module fault of some kind. Probably need to have Freightliner use ServiceLink to retrieve actual fault code causing the condition.

Our Freightliner-based Senecas use a multiplexed electrical system, when you turn the key you are sending a command to a module that then triggers an output to actually crank the starter. Most of our dash switches do the same to actuate whatever component they are linked to.

Makes it very difficult for us driveway mechanics to troubleshoot and repair. And obtaining ServiceLink is expensive, if not impossible, for an unaffiliated individual.
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Old 09-17-2016, 02:58 PM   #4
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Do you have something plugged into the cigar lighter that could be causing a problem?

"The cigar lighter provides 12 volt power (up to 15amps) to any device plugged into it. The Bulkhead Module (BHM) supplies power at this port regardless of the position of the ignition switch.
The BHM is capable of detecting short circuits in the cigar lighter wiring."

It could just be a intermittent connection at the Bulkhead Module (BHM). Remove all connectors from the BHM, check, clean, and reattach, confirming each connection it tight.
As mentioned these are complicated beasts with many systems that need to communicate the right information at the right time.

Here is the public Freightliner BHM service guide if you don't already have it; https://secure.freightliner.com/acce...a5412000wm.pdf

The code 33 is listed in the guide and there are also 15 references to the cigar lighter circuit which you would think is simple and irrelevant to engine operation but the guide says something a lot different.
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Old 09-20-2016, 12:02 PM   #5
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Thank you all for the suggestions and the awesome link. Had not seen that before.

No remote start. Nothing plugged into cigar lighter (though it does work).

I am going to try wiggling all of the bulkhead connectors and then sounds like I will have to call Freightliner. I'm a pretty good troubleshooter but if it requires a laptop and proprietary software - I'm out.
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Old 09-20-2016, 12:21 PM   #6
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Good luck, let us know how things turn out in case another Seneca owner encounters the same thing. This forum and the exchange of information it provides is invaluable.

My Seneca is at my local Freightliner dealer (Young Truck, Canton, OH) right now being investigated for what I think might be a bad downstream NOx Sensor. Had MIL on for most of drive last week coming back from Connecticut. ScanGauge had code which showed sensor trouble in aftertreatment system. Glad I am still in warranty!
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Old 09-27-2016, 02:46 PM   #7
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Well... just picked up the Seneca from Freightliner.

The dealer:
- Pulled the error code which was 'abnormal transmission update rate'
- Cleared the error code
- Disconnected batteries & checked voltage. Voltage was good.
- Drove MH on a test drive for 118 miles??????
- Could not duplicate error
- Checked transmission connections and could not find a problem
- Suggest that 'owner might not be letting gauges sweep before starting' causing the no start condition. (???????)

Total Labor Bill $656.95


Are you serious!!!!

I asked them, since they could not find a problem, what happens if it does it again. He said labor was labor and there was nothing they could do about it. And a 118 mile test drive???? I think the only reason they stopped was they were almost out of fuel.

They would not let me leave until I payed. I'm debating my next move.

Is this bill even anywhere near the realm of reasonable?
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Old 09-27-2016, 03:17 PM   #8
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$700.00 And they didn't fix anything?!?!?


I'd call that "outrageous".


How close was warrantee end? Was the problem first reported under the warrantee widow?


How about reimbursing you for 118 miles worth of fuel?
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Old 09-27-2016, 03:53 PM   #9
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I'm not sure about warranty. I will have to see when it was purchased but I think it was originally sold in late 2013 which would make the warranty over?

I did just catch them in a little lie. According to the technicians written report he drove my MH to a neighboring town and back on two different days for test drives. That drive adds up to 118 miles... but there is only 35 more miles on the odometer. Hmmmm?
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Old 09-27-2016, 04:29 PM   #10
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Many people think RV owners have more money.
One of the last and only times we were on the road and at the mercy of a diesel shop owner for repairs his response after we asked for a discount on labor was "I have to put food on the table". Well so do we. "My kids need sports uniforms." Well so do ours. Etc.
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