No bus ground issues 2001 1500
#1
No bus ground issues 2001 1500
So I apologize if there’s already a post about this but I’m having current issues so I wanted to know if anybody had any ideas
I have a 2001 Ram 1500 5.9 V8
out of the blue while it was idling it just stopped Dead. Followed by a no bus statement on the odometer Spontaneously I can get it to start but usually within three minutes it will automatically just shut off by itself with the key in the on position
I assume it might’ve been a crank sensor, so i changed that out it appeared to run better, but still had that three minute Window before shutting off automatically
Other than the gauge cluster not activating correctly causing a no start and now a left front headlight is not turning on. I’m assuming it’s probably a Ground issue anyone have any idea I would appreciate it
I have a 2001 Ram 1500 5.9 V8
out of the blue while it was idling it just stopped Dead. Followed by a no bus statement on the odometer Spontaneously I can get it to start but usually within three minutes it will automatically just shut off by itself with the key in the on position
I assume it might’ve been a crank sensor, so i changed that out it appeared to run better, but still had that three minute Window before shutting off automatically
Other than the gauge cluster not activating correctly causing a no start and now a left front headlight is not turning on. I’m assuming it’s probably a Ground issue anyone have any idea I would appreciate it
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So far, I haven’t been able to get it to restart
When it’s in this no bus mode, it shows up with no communication on the port
I did the self diagnostic on the cluster and it came up with a 921,922 and a 999 cluster code
I also spent time and tried to clean the main connectors on the front distribution box, and under the dash
When it’s in this no bus mode, it shows up with no communication on the port
I did the self diagnostic on the cluster and it came up with a 921,922 and a 999 cluster code
I also spent time and tried to clean the main connectors on the front distribution box, and under the dash
#7
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#8
So at the moment I’m getting a continuous no bus the only way I can unplug sensors and get a no bus as if it’s actually going to react like that
I went around with the probe and checked my grounds under the hood. They all appear to be good, including the one for the PCM. Other than an ECM ground that I was told supposedly is near the starter.
I don’t know where there is other ground locations under the dash
I went around with the probe and checked my grounds under the hood. They all appear to be good, including the one for the PCM. Other than an ECM ground that I was told supposedly is near the starter.
I don’t know where there is other ground locations under the dash
#9
So I have an update, I thought that it was my throttle position sensor because I was getting no signal while the pigtail was plugged into it, but I could get it when it was unplugged. I changed it and it ran good for about 30 minutes. I was able to drive it around the block once and then it just died and went back to the no bus issue. Kind of running low on options. I didn’t see any issues with the live data. And I kind of feel that it might be unlikely that it’s the module itself because it does have these moments of operating properly unless it’s just a short in the harness somewhere or something?
#10
"no bus" means the cluster doesn't get any data from the PCM. While it could be that something faulty is causing havoc on the bus, the fact that the scan tool can't talk to the PCM in the "no bus" state would indicate the PCM itself is down (Basic OBD2 does not use the CCD bus). Double check the basics, power & ground. On PCM connector 1 pin 2 is switched power (light green/black), pin 22 is permanent power (red/white), pins 31 and 32 are ground (black/tan). The grounds go to G105 at the front of the engine. You can check the ground via the OBD2 port pin 5 (black/tan) which goes to the PCM and from there to G105.
Edit: Also make sure that the engine ground strap is good.
Edit: Also make sure that the engine ground strap is good.
Last edited by DerTruck; 01-27-2024 at 07:57 PM.