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Need Your Help on 2 Issues With My 1999 VNL610 With a DD S60 Engine and Fuller Manual Trans


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Your comments on these 2 issues are very much appreciated.

First issue: While driving my HDT to the truck repair shop for a diagnosis on the Truck ABS Telltale, it would not turn off, I encountered the following intermittent issue.  The CAUTION Telltale illuminated and the engine RPM dropped to idle and I had NO throttle response.  This condition would continue for a short period and without any input the CAUTION Telltale would turn off and I would regain throttle response.  This intermittent issue continued all the way to the shop.

I reported this intermittent condition to my truck repair shop.  The fault code from the diagnosis was PID:91 FMI: - Pedal position sensor.  Current too low or short circuit caused by undervoltage.

The shop installed a new throttle pedal assembly, checked batteries and  replaced one battery.  The fault code was cleared.  I drove the truck back to the storage yard and replaced the other three batteries.

Days later I started to take the truck out from the storage yard and the intermittent issue, described above, returned.

Has anyone encountered this issue?

What caused the issue?

How was the issue corrected?

Second issue: Before leaving the storage yard I did a System Diagnostic test, using the Graphic Display Controls, and the following text was displayed in the Graphic Display (bottom left-hand corner of the instrument cluster).

Line 1: Cluster Self Test Mode

Line 2: SW ID : 8.80

What does this mean?

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The current software appears to be version 8.80

You seem to have the cluster in the self test mode as well.

I would suspect corrosion somewhere in the wiring leading to the pedal.  The loss of amps is enough to confuse the throttle pedal sensor.

2006 Volvo VNL 780, " Arvey"  Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift

2003 Jeep Wrangler Rubicon

2010 Forest River Coachman Freedom Express 280RLS


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If you still have the old throttle pedal, you can test it using an old style needle meter. Hook the meter leads up, move the pedal through it's range of motion, while watching the needle. You want to see a smooth progression of the resistance. Any notchyness is a fail. The shop should have done this, but most shotgun parts, anymore.

I have been wrong before, I'll probably be wrong again. 

2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication
2006 smart fourtwo cdi cabriolet
2007 32.5' Fleetwood Quantum

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    Something I found years ago may help.  If you look on both sides of the firewall, on the engine side. There should be 3 ground post on each side of the fire wall. Remove and clean all surfaces.

  This is on a Volvo cab of your vintage.


  Just by chance,   Vern in a T-shirt 

Edited by Wrknrvr
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Any chance of some kind of liquid running down the throttle cable into the pedal position sensor?  I sprayed kids bubble soap onto the wire bundle above the sensor to find an air leak.  That ran down the cable and into the sensor and made the sensor fail.  I replaced it.

Chet & Deb
'01 Volvo 660 w/ Smart
'19 Forest River Columbus 320RS 5th wheel
2022 Chev 2500HD Long Bed
Retired CWO4, USN and federal service
Electronics Tech/Network Engineer/Welder/Machinist

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