2017 Express 4500 cutaway
#1
2017 Express 4500 cutaway
Howdy!!! Hoping I can maybe get some direction here. Frustrated doesn't begin to describe my attitude with the RV right now. Specifics....2017 Chevy Express Cutaway RV (Coachmen), 6.0 , automatic....10,000 miles...Crank/no start...Checked error codes...P1682......Checked grounds, changed the ignition switch, swapped a couple of relays with each other (it appears several are the same in the fuse block under the hood), tried finding a wiring diagram to try to troubleshoot but could not find a match for this year/type/model (I know that many models are similar but no luck so far).
Background: RV is driven infrequently but started at least twice monthly during the offseason. Started everytime until I went to use it!!!! Crank but no start. Plenty of gas. The only thing I have been able to sleuth is on the fuse block under the hood there appears to be one "bank" of fuses (#'s 61-65 and #'s 75-79) that have a low voltage when key is in start position (1.56 V)...I am assuming there is a relay that feeds these because they are 10-20 amp fuses. Guessing it is not directly from the ECM. Any help would be appreciated.....
Background: RV is driven infrequently but started at least twice monthly during the offseason. Started everytime until I went to use it!!!! Crank but no start. Plenty of gas. The only thing I have been able to sleuth is on the fuse block under the hood there appears to be one "bank" of fuses (#'s 61-65 and #'s 75-79) that have a low voltage when key is in start position (1.56 V)...I am assuming there is a relay that feeds these because they are 10-20 amp fuses. Guessing it is not directly from the ECM. Any help would be appreciated.....
#2
CF Monarch
I'm not a real van guy, but here is what I found about the GM code P1682:
P1682 CHEVROLET Possible Causes:
Faulty:Ignition Switch harness is open or shorted Ignition
Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)
I hope it's not the ECM, Those are not cheap, but like anything, they can go bad.
P1682 CHEVROLET Possible Causes:
Faulty:Ignition Switch harness is open or shorted Ignition
Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)
I hope it's not the ECM, Those are not cheap, but like anything, they can go bad.
#3
Thank you....found those as well....still trying to determine where there may be a "faulty electrical connection" but cannot find a wiring diagram. Thinking I may pull the fuse block and check connections on rear of that. Thanks for the response!!!!
#4
wiring diagrams on gmupfitter.com
The following users liked this post:
Triaged (August 21st, 2021)
#5
2017 Chevrolet no start problems
check your grounds there is one particular ground on the left rear chassis that controls the fuel pump I've had found this to be a problem with several vans.
#6
Found it....hope it helps someone else
After numerous troubleshooting sessions everything kept pointing to a loose connection on the back of the fuse block. The problem was showing itself as low voltage on a certain section of the fuse block, and of course the no start problem. Turns out the fuse block is not just a simple connection block but contains some micro circuitry on the rear of it with numerous small components that can go bad. Only discovered this through a frustrated Sunday night session where I determined I was going to pull the whole vehicle part if I had to... Pulled the fuse block and saw that it was more than a simple connection. Ordered a new one the next morning for $196 from the Chevrolet dealership. Had it within 2 days. 30 minutes later the truck started 🤪... Hopefully this will help someone else...
#7
We have a ‘15 4500 chassis under our class C and it’s had intermittent electrical issues for several years. The latest being the climate control.
How much of a struggle was it to change that fuse panel?
How much of a struggle was it to change that fuse panel?
Trending Topics
#8
30 min out and back in....couple power connections and three bolts...you will have to separate the"holder" (plastic carrier under the fuse block) once you have it out. Took me a little while to figure out they came apart, and that the part the dealership sent me was the correct part. Looked different until I determined what I removed is actually two pieces that look like one. Once I saw the panel could be removed is when the light bulb came on 💡
#9
Great, thanks. Can’t find the PN on any of the usual sits so, headed to the dealer tomorrow to order it and the one under the seat.
Last edited by funtwodrv; January 18th, 2022 at 9:42 AM.
#10
Have had this issue
Howdy!!! Hoping I can maybe get some direction here. Frustrated doesn't begin to describe my attitude with the RV right now. Specifics....2017 Chevy Express Cutaway RV (Coachmen), 6.0 , automatic....10,000 miles...Crank/no start...Checked error codes...P1682......Checked grounds, changed the ignition switch, swapped a couple of relays with each other (it appears several are the same in the fuse block under the hood), tried finding a wiring diagram to try to troubleshoot but could not find a match for this year/type/model (I know that many models are similar but no luck so far).
Background: RV is driven infrequently but started at least twice monthly during the offseason. Started everytime until I went to use it!!!! Crank but no start. Plenty of gas. The only thing I have been able to sleuth is on the fuse block under the hood there appears to be one "bank" of fuses (#'s 61-65 and #'s 75-79) that have a low voltage when key is in start position (1.56 V)...I am assuming there is a relay that feeds these because they are 10-20 amp fuses. Guessing it is not directly from the ECM. Any help would be appreciated.....
Background: RV is driven infrequently but started at least twice monthly during the offseason. Started everytime until I went to use it!!!! Crank but no start. Plenty of gas. The only thing I have been able to sleuth is on the fuse block under the hood there appears to be one "bank" of fuses (#'s 61-65 and #'s 75-79) that have a low voltage when key is in start position (1.56 V)...I am assuming there is a relay that feeds these because they are 10-20 amp fuses. Guessing it is not directly from the ECM. Any help would be appreciated.....