So upon doing more reasearch seems like the service trailer brake light now has to do with the tcm. If the tcm is bad would that give me the u0100 code for no communcation with ecm also? The fact that im getting both u0100 and u0101 is whats goofy.
Truck won’t crank
- Thread starter Josh154
- Start date
If it's not talking to tcm it won't start. If your tcm is stock try pulling the stock file off of it.
Turbo, cp3, injectors, 8 new glow plugs. Glow plug module was taken out, tried reseating all glow plug module connections.
I already have the stock tcm file, it was flashed with Ppei tune over a year ago.
I already have the stock tcm file, it was flashed with Ppei tune over a year ago.
Can you explain more? What could I have done to do this? I was putting new radiator pipe in trying to line it up with forward facing t stat housing and could have easily touched tcm and t stat housing with that pipe
If it’s not talking to tcm would I get both of those codes? If I clear the 2 codes they come back right away.
Tried disconnecting tcm and still wouldn’t crank. I guess I didn’t try to flash ecu at that point to see if I had communication.
If I touched that coolant pipe to motor and tcm would that have ruined the tcm?
If I touched that coolant pipe to motor and tcm would that have ruined the tcm?
you need to check communication with a scam tool with the tcm unplugged. truck will not start with tcm unplugged. I cant say that grounding the tcm case will not hurt it but I have don't it a dozen plus time with no issue. again not saying it cant happen
I cannot flash either one. Will my cts or autocal check communication with ecu and tcm unplugged?
I was saying to ground the Tcm case. Take a jumper wire from the Tcm fins to a good ground.
not sure on that. think it would . here is a pin put for the tcm check the powers and gronds
Transmission Control Module (TCM) (MW7)
Connector Part Information
- OEM Connector: 13551663
- Service Connector: 88988934
- Description: 80-Way F (BK)
- Pins: 6, 9–11, 20, 25, 27, 33, 36, 40, 47, 51–52, 55, 60, 63, 66, 69–71, 74, 78, 80
- Terminal/Tray: 33012-1002/26
- Core/Insulation Crimp: E/C
- Release Tool/Test Probe: 12094429/J-35616-14 (GN)
- Pins: 14, 17, 34, 43, 53–54, 57–58, 73, 77, 79
- Terminal/Tray: Service by Connector Assembly - See Part Catalog
- Core/Insulation Crimp: Not Available
- Release Tool/Test Probe: Not Available
Wire
Circuit
Function
1–5
—
—
Not Used
6
0.5 TN/BK
2500
High Speed GMLAN Serial Data Bus+
7–8
—
—
Not Used
9
0.8 BK/WH
451
Ground
10
0.5 RD/WH
1840
Battery Positive Voltage
11
0.5 OG/BK
1228
PC Solenoid Valve High Control
12–13
—
—
Not Used
14
0.35 GY
773
Transmission Range Switch Signal C
15–16
—
—
Not Used
17
0.35 PK
1224
Transmission Fluid Pressure Switch Signal A
18–19
—
—
Not Used
20
0.5 L-BU
1984
Transmission Turbine Speed Switch Low Reference
21–23
—
—
Not Used
24
—
—
Not Used
25
0.5 OG/BK
6399
Replicated TOS Signal
26
—
—
Not Used
27
0.5 TN
2501
High Speed GMLAN Serial Data Bus−
28–32
—
—
Not Used
33
0.5 YE/RD
1223
Shift Solenoid 2 Valve Control
34
0.35 WH
776
Transmission Range Switch Signal P
35
—
—
Not Used
36
0.5 BN/WH
2469
PC Solenoid Valve Low Control
37–39
—
—
Not Used
40
0.5 L-GN/BK
822
VSS Low Signal
41–42
—
—
Not Used
43
0.35 D-BU
5985
Accessory Wakeup Serial Data
44–46
—
—
Not Used
47
0.5 TN
2501
High Speed GMLAN Serial Data Bus−
48–50
—
—
Not Used
51
0.5 OG/WH
2527
Shift Solenoid C Valve Control
52
0.5 L-GN
1222
Shift Solenoid 1 Valve Control
53
0.35 YE
772
Transmission Range Switch Signal B
54
0.35 YE/BK
1227
TFT Sensor Signal
55
0.5 L-BU/WH
1229
PC Solenoid Valve Low Control
56
—
—
Not Used
57
0.35 OG
1226
Transmission Fluid Pressure Switch Signal C
58
0.35 TN
2762
Low Reference
59
—
—
Not Used
60
0.5 PU/WH
821
VSS High Signal
61–62
—
—
Not Used
63
0.5 PK
2139
Ignition 1 Voltage
64–65
—
—
Not Used
66
0.5 TN/BK
2500
High Speed GMLAN Serial Data Bus+
67–68
—
—
Not Used
69
0.8 BK/WH
451
Ground
70
0.5 RD/WH
1840
Battery Positive Voltage
71
0.5 BN
323
Actuator Supply Voltage
72
—
—
Not Used
73
0.35 TN/WH
771
Transmission Range Switch Signal A
74
0.5 D-BU
1530
Transmission Mainline Pressure Solenoid Control
75–76
—
—
Not Used
77
0.35 L-GN/BK
2529
Fluid Pressure Switch Signal 4
78
0.5 BN
418
TCC PWM Solenoid Valve Control
79
0.35 D-BU
1225
Transmission Fluid Pressure Switch Signal B
80
0.5 OG
1983
Transmission Turbine Speed
Ok I will check tomorrow. And if I have power to tcm and still won’t communicate I have a bad tcm which would cause ecu not to connect as well?
if the tcm shorted internally it could drag down the communication line. but the only way to be sure is to check powers, grounds, igntion voltage at tcm. if all there then leave it unplugged and try to use a scan tool to talk to ecm. if you can talk to ecm with tcm unplugged the tcm died