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No start low oil level warning.

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Old Jun 30, 2025 | 09:02 AM
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Default No start low oil level warning.

My 01 will start but then die in a few seconds. Only thing on the dic is low oil level but level is full. Any ideas?
battery is less than a year old.
On tender at 14.7 volts 99% of the time.
tried original key and brand new key same thing
Dont know if oil level warning is an combo issue or just a coincidence.
video of that it is doing.
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Old Jun 30, 2025 | 09:24 AM
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The very first thing to do is retrieve the codes.
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Old Jun 30, 2025 | 11:51 AM
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Possible communication issue from what I can see in the video...a no start or a start and stall.


https://www.youtube.com/live/f_NEEdg...z4pqwz1_N1Fzuv

Last edited by C5 Diag; Jun 30, 2025 at 12:03 PM.
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Old Jun 30, 2025 | 11:58 AM
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If you have some mechanical or electrical experience you can try this….


1) Locate the 2 Star Connectors to the left of the BCM and remove the buss bar or “comb” from star connector #2…it has 4 wires on it…see if the car starts…if no start go to next step.

2) Now remove the comb off the other star connector leaving both combs removed…make a jumper wire and jumper the BCM to PCM…light green to dark green wire….if car starts you have a module other than the BCM and PCM on star connector #1 pulling the data bus down….if car still doesn’t start the module pulling the bus down is either the BCM or PCM…go to next step.

3) Take your jumper wire and connect from the purple wire (data bus wire) to the PCM (dark green wire)…now with your scan tool see if you can communicate with the PCM…if you can now communicate the PCM is good and issue may be the BCM…to see if the BCM is indeed bad take the jumper wire and connect the jumper now to the BCM (light green)…with a scan tool that can communicate with ALL modules (NOT a code reader) and if you can’t communicate we can “assume” BCM is bad…for single module “no comm” you want to check the powers and grounds to that module.
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Old Jun 30, 2025 | 01:02 PM
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Originally Posted by mmartinez
The very first thing to do is retrieve the codes.
no codes other than my no comm from tcs which has been there
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Old Jun 30, 2025 | 04:35 PM
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Erase all your DTC’s and see what comes back during the next few ignition cycles.
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Old Jun 30, 2025 | 06:20 PM
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I figured out that if I leave the key to start it would stay running. I tried two separate ignition switches and both door it.
so also with a low oil level warning is theris something specific?

After I cleaned all grounds in the front of the engine bay. 104 108 102 engine grounding strap. Still getting low oil level warning and now it will only try to start. Will not turn over now.
i really thought it was sp122 and the fuel pump relay.

Last edited by Woopigsooie00; Jul 1, 2025 at 05:14 PM.
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Old Jul 1, 2025 | 09:40 AM
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Originally Posted by Woopigsooie00
I figured out that if I lead the key to start it would stay running.
What does "lead the key" mean?

Originally Posted by Woopigsooie00
I tried two separate ignition switches and both door it.
Why? What troubleshooting led to this?

Originally Posted by Woopigsooie00
so also with a low oil level warning is theris something specific?
No offense intended, but this is the most basic circuit on a C5. Two pin connector. 12v and ground. If you are struggling with this, best to take it to a trusted shop.

Originally Posted by Woopigsooie00
After I cleaned all grounds in the front of the engine bay. 104 108 102 engine grounding strap. Still getting low oil level warning and now it will only try to start. Will not turn over now.
i really thought it was sp122 and the fuel pump relay.
....only SP122 gets a ground from G105 on the left/rear/lower engine block.

Where is the troubleshooting?

Does the fuel pump run for 2 secs at key to ON?
What is the fuel pressure at the rail?
Does the fuel pressure hold?
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Old Jul 1, 2025 | 05:57 PM
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Leave = if I hold the key to start which no longer works now
read other threads with the same symptoms and their issue was ignition switch. I have a spare so I swapped it.
the low oil warning is not the issue could be as simple as the sensor. It is just something that has been happening since the no start issue.
Fuse and relay are getting 12 volts when key is on position
security light tirns on for 2 seconds then off
[size=16px]fuel pump relay ground goes to a splice pack (sp122) under the batter tray. SP122 is in turn grounded at the left lower side of the block at G105 [/size]
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Old Jul 1, 2025 | 07:06 PM
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Make sure your car is in Park if auto, or neutral if a M6, insert a wire jumper between the red and purple wires at the TDR. Leave the key in the On/ Run position if the car cranks over and starts then it's something upstream of the TDR, if it doesn't crank over it could be loose battery cables, loose cables at the starter solenoid, or possibly a bad starter or the solenoid.
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Old Jul 3, 2025 | 09:13 AM
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I ended up purchasing an Innova 5610. It is saying I have 40 active dtc 's from the pcm. So I am guessing I need to look at g106 first.
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Old Jul 3, 2025 | 09:14 AM
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And the 4 pcm wires there.
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Old Jul 3, 2025 | 09:22 AM
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So you are saying you have 40 current (active ??) DTC’s ??..I doubt that…I’ve seen people using this scan tool say the same thing…can you post these trouble codes ??

Last edited by C5 Diag; Jul 3, 2025 at 09:28 AM.
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Old Jul 3, 2025 | 09:28 AM
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So do you have a "no start" ....or ......"no crank" issue? Unless there is a communication issue, there is not anything that innova will tell you that the DIC won't.
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Old Jul 3, 2025 | 09:33 AM
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Originally Posted by lucky131969
So do you have a "no start" ....or ......"no crank" issue? Unless there is a communication issue, there is not anything that innova will tell you that the DIC won't.
@ C5 Diag I will post when I get off today.
@lucky it is no start. Will attempt to crank all day it was actually starting for one or two seconds and then dying and now it won't start at all I'm also going to put a fuel gauge on it when I get home because I don't hear the fuel pump cutting on when I turn the key also still got to jump the Anti-Theft but the security light is coming off for 2 seconds and going off like it's supposed to
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Old Jul 3, 2025 | 03:34 PM
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I suggested jumpering at the TDR because it wasn't clear if you had a no crank, or a no start problem. Disregard my previous advice since it's clear that the car cranks but doesn't start.
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Old Jul 4, 2025 | 08:18 AM
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Okay so. The innova 5610 codes are
P0 101 102 103 108 125 128 130 131 132 133 134 135 136 137 138 140 141 150 151 152 154 155 157 158 161 171 172 174 175 200 230 300 325 327 332 335 336 342 343 410

DIC only says u1040 H C


fuel pressure is zero at Schrader valve. Before during and after crank
fuse 13 and relay 35 are good.

Last edited by Woopigsooie00; Jul 4, 2025 at 08:30 AM.
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Old Jul 4, 2025 | 08:27 AM
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Clear ALL DTC’s on your scan tool and the DIC and see what comes back…I’m sure you don’t have all those Powertrain codes…if you are actually setting a particular DTC you will see that on both…don’t know if you are using that scan tool correctly…I’d contact Innova and I believe they are a supporting vendor here on the Forum.
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Old Jul 4, 2025 | 08:32 AM
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Yeah only common dtc is 1040 from the ebcm no comm
its no fuel pressure.
Pump isnt cutting on, no prime or anything
fuse 13 and relay 35 are good
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Old Jul 4, 2025 | 08:37 AM
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Like I said previously may be a comm issue…follow what I posted in step 2…remove the “comb” from the Star Connector with the 8 or 9 wires and jumper the light green and dark green wires…all you need is PCM and BCM for the car to start…if you crank the engine over does the Tach move ??
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