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My truck is pulling up the following codes. SPN-33 Clutch…

My truck is pulling...

My truck is pulling up the following codes. SPN-33 Clutch cylinder position, SPN-37 Transmission Air tank pressure, SPN-4375 Aftertreatment DEF pump drive percentage, SPN-627 Power supply (obsolete)

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Thank you!

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

I would like too. just turning it on and off so far. I would like to know what I can do before I try it and make it worse

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

Thats all I got. It started pretty rough this morning and it wont rev up. however, it is very cold out. 15deg.

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Answered in 1 hour by:
1/16/2018
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,890
Experience: Owner at DJ Wilson
Verified

Hi ,My name is***** will be glad to help. We can follow up as needed on here, Give me some time to review your information and post my responses. Im not an employee of the site but I help on here as time allows in between jobs. Response time will vary depending on my work load , etc. What is the year make and model of your truck? Also the engine and transmission make/models?

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Customer reply replied 7 months ago
2015 Volvo, D16 VNL

Volvo_SPN_4375_MID128_PSID_121 is typically a failed DEF pump or a wiring issue to the pump

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Click on this link for the code definitions and possible causes i uploaded for you for each FMI number with this fault. Let me know

4375 troubleshooting

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Trans air tank pressure fault check for restrictions from ICE in the lines from moisture freezing supplying the transmission if the rest of the air system is getting full pressure and no issues. Check for leaks as well.

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This also can be a cause of the clutch cylinder position fault as well. Correct the air supply first and let me know.

Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated.

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Customer reply replied 7 months ago
Ok great thanks!

Pleasure to help

Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,890
Experience: Owner at DJ Wilson
Verified
Daniel Wilson and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Hi, Did you get this resolved? I see this is still open. Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated. It's been a pleasure working with you on this.

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