Service code summary – Spicer TPCS Troubleshooting Guide User Manual
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Diagnostics
Service Code Summary
Group Code
System Status
Description
1C!
17
No Operation
Power - battery voltage out of range at the ECU
3C!
18
Normal Operation
Speed Signal - no speed detected during multiple ignition cycles
76
Normal Operation
J1587 Speed Message - not receiving expected messages on J1708 data link
77
Normal Operation
J1939 Speed Message - not receiving expected messages on data link
4C!
15
Inflate Only
Display Control Communications - ECU not receiving communications from user
interface
5C!
33
No Operation
PCU Sensor - signal voltage too high
34
No Operation
PCU Sensor - connector unplugged; signal voltage too low
12C!
51
No Operation
PCU Solenoid, Front - connector unplugged; faulty wiring or solenoid
52
No Operation
PCU Solenoid, Rear - connector unplugged; faulty wiring or solenoid
53
No Operation
PCU Solenoid, Trailer - connector unplugged; faulty wiring or solenoid
54
No Operation
PCU Supply Solenoid - connector unplugged; faulty wiring or solenoid
55
No Operation
PCU Deflate Solenoid - connector unplugged; faulty wiring or solenoid
56
No Operation
PCU Control Solenoid - connector unplugged; faulty wiring or solenoid
1P!
11
No Deflation
Deflate Signal, Front - could not generate a vacuum in control lines
12
No Deflation
Deflate Signal, Rear - could not generate a vacuum in control lines
13
No Deflation
Deflate Signal, Trailer - could not generate a vacuum in control lines
16
Normal Operation
Deflate Signal - could not generate a vacuum in one or more channel's control lines
22
Inflate Only
Deflate Signal, PCU - could not generate a vacuum in pneumatic control unit
2P!
14
Inflate Only
Deflate Trend - tire pressure did not decrease properly during deflate
3P!
21
Inflate Only
Vacuum - unintentional vacuum in PCU
4P!
23
Pressure Check Only Between Modes, Front - inflated or deflated too slowly
24
Pressure Check Only Between Modes, Rear - inflated or deflated too slowly
25
Pressure Check Only Between Modes, Trailer - inflated or deflated too slowly
5P!
26
Pressure Check Only Low Pressure, Front - open line or large seal leak
27
Pressure Check Only Low Pressure, Rear - open line or large seal leak
28
Pressure Check Only Low Pressure, Trailer - open line or large seal leak
7P!
31
Pressure Check Only Pressure Switch - failed closed or wiring shorted
32
Pressure Check Only Low Air Supply - pressure switch did not close
8P!
35
Pressure Check Only Atmospheric - PCU sensor reading out of range
9P!
36
Channel Inoperative
Inflate Trend, Front - tire pressure decreased during an inflate
37
Channel Inoperative
Inflate Trend, Rear - tire pressure decreased during an inflate
38
Channel Inoperative
Inflate Trend, Trailer - tire pressure decreased during an inflate