Fault
Code |
Circuit
Index |
Condition Description |
Comments |
Probable Causes |
| 10 |
N/A |
Separator Code |
Transmitted between present and
historical faults |
N/A |
| 50 |
N/A |
Cylinder ID code for diesel |
Displayed during KOER test |
N/A |
| 51-58 |
N/A |
Active cyl. in CCT test |
Displays tested cylinder -- CCT test |
N/A |
| 111 |
N/A |
System Pass |
No PCM system faults detected |
N/A |
| 116 |
EOT |
EOT below KOER limits |
Aborts KOER test |
Engine not up to operating temp.,
leaking thermostat |
| 117* |
EOT |
EOT circuit out of range low |
No cold adv., fast low idle, EBP
disabled |
Grounded circuit, biased sensor or PCM |
| 118* |
EOT |
EOT circuit out of range high |
No cold adv., fast low idel, EBP
disables |
Open circuit, biased sensor or PCM,
short to 5V |
| 122* |
AP/IVS |
AP Sensor Signal ORL |
Engine will only idle if hard fault |
Grounded circuit, biased sensor or PCM |
| 123* |
AP/IVS |
AP Sensor Signal OHH |
Engine will only idle if hard fault |
Open circuit, biased sensor or PCM,
short to 5V |
| 124* |
AP/IVS |
Idle validation switch fail |
Switch Test - KOER |
Short/Open circuit, switch failure,
operator, PCM |
| 125* |
AP/IVS |
Idle validation switch fail |
Engine will only idle if hard fault |
Failed Pedal Assembly |
| 126* |
MAP |
MAP signal out of range high/low |
Uses inferred MAP signal |
Noise, faulty sensor, Intermittent
open |
| 127* |
MAP |
MAP inactive signal |
Uses inferred MAP signal |
Open, short to gnd or 5v, faulty
sensor |
| 128* |
MAP |
MAP In-range failure |
Uses inferred MAP signal |
Restricted inlet/exhaust/supply hose,
tampering |
| 145 |
EBP |
EBP circuit out of range low |
Disables back pressure device |
Open/Grounded circuit, biased sensor
or PCM |
| 146 |
EBP |
EBP circuit out of range high |
Disables back pressure device |
Circuit shorted to 5v, biased sensor
or PCM |
| 147 |
EPR |
Excessive back pressure |
Disables back pressure device |
Plugged sensor line, stuck butterfly,
restricted exhaust |
| 151 |
IAT |
IAT circuit out of range low |
Disables back pressure device |
Grounded circuit, biased sensor or PCM |
| 152 |
IAT |
IAT circuit out of range high |
Disables back pressure device |
Open circuit, biased sensor or PCM,
short to 5V |
| 153 |
ICP |
ICP circuit out of range low |
Uses inferred ICP strategy |
Open/Grounded circuit, biased sensor
or PCM |
| 154 |
ICP |
ICP circuit out of range high |
Uses inferred ICP strategy |
Circuit shorted to 5v, biased sensor
or PCM |
| 155 |
IPR |
Excessive ICP pressure |
System fault |
Faulty IPR regulator (sticking), IPR
shorted to ground |
| 511 |
PCED |
PCM ROM test failure |
|
Internal PCM failure |
| 512 |
PCED |
KAM memory loss |
No historical faults output during a
KOEO test |
Open PCM pin, disconnected B+, faulty
PCM |
| 514 |
EPR |
EPR circuit failure |
Exhaust Back pressure Regulator OCC |
Open/grounded crkt., solenoid
open/shorted, failed PCM |
| 515 |
GP |
GP relay output circuit failure |
Glow Plug Relay OCC - KOEO only |
Open/grounded crkt., solenoid
open/shorted, failed PCM |
| 516 |
GP |
GP Lamp output circuit failure |
Glow Plug Lamp OCC - KOEO only |
Open/grounded circuit, lamp open,
failed PCM |
| 517 |
PCED |
Battery voltage above normal |
May be temporary condition - 24V jump
start |
High Syst. Voltage, Charging Sys.,
Internal PCM failure |
| 518 |
PCED |
Battery voltage below normal |
May be temporary condition at crank
only |
Low Syst. Voltage, Charging Sys.,
Internal PCM failure |
| 523 |
PCED |
PCM Inactive Background fault |
Internal PCM fault |
Internal PCM failure |
| 528 |
CPP |
CPP switch circuit failure |
Switch Test - KOER |
Open/short circuit, Switch/PCM
failure, failed to activate switch KOER. |
| 536 |
BOO |
Brake On/Off switch circuit failure |
Switch Test - KOER |
| 546 |
IPR |
IPR circuit failure |
Injection Pressure Regulator OCC -
KOEO only |
Open/grounded circuit, solenoid |
| 547 |
PCED |
OCC sig. High |
Ignore any output circuit codes set |
High battery voltage, Internal PCM
fault |
| 548 |
PCED |
OCC sig. Low |
Ignore any output circuit codes set |
Low battery voltage, Internal PCM
fault |
| 549 |
PCED |
IDM_EN circuit failure |
IDM Enable Relay OCC - KOEO only |
Open relay, blown fuse, open grounded
circuit |
| 815 |
PCED |
Excessive Engine RPM |
Transmission incorrectly
downshifted or wrong gear selected down hill |
| 816 |
CMP |
CMP/SYNC Counts |
Incorrect number of CMP transition
counts |
CAMP Sensor fault, Noise Coupling |
| 817 |
CMP |
Noise Rejection |
Electrical Noise Detected |
Harness routing, charging circuit
problems, sensor fault |
| 818 |
CMP |
Inactive CMP Sensor |
No CMP sensor signal detected during
cranking |
Open/grounded circuit/sensor fault |
| 819 |
ICP |
ICP higher than expected KOEO |
Sensor volt not at expected level with
KOEO |
Biased sensor or circuit |
| 827 |
BARO |
BARO circuit out of range low |
Defaults to 101 Kpa |
Open/Grounded circuit, biased sensor
or PCM |
| 828 |
BARO |
BARO circuit out of range high |
Defaults to 101 Kpa |
Circuit shorted to 5v, biased sensor
or PCM |
| 831 |
PCED |
Spd Cntrl ON not pressed |
Switch Test - KOER (Code set if cruise
not present) |
Open or short circuit, Switch
failure, PCM failure or failed to activate switch during KOER test.
Cruise control codes will be set on every KOER test on
vehicles not equipped with cruise control.
|
| 832 |
PCED |
Spd Cntrl OFF not pressed |
Switch Test - KOER (Code set if cruise
not present) |
| 833 |
PCED |
Spd Cntrl RESUME not pressed |
Switch Test - KOER (Code set if cruise
not present) |
| 834 |
PCED |
Spd Cntrl SET not pressed |
Switch Test - KOER (Code set if cruise
not present) |
| 835 |
PCED |
Spd Cntrl COAST not pressed |
Switch Test - KOER (Code set if cruise
not present) |
| 841 |
IPR |
ICP pressure is Above/Below Desired |
Continuous & On Demand Test - KOER |
Failed/stuck IPR valve |
| 842 |
EPR |
EBP pressure Above/Below Desired |
On Demand Test - KOER |
Failed/stuck EPR valve |
| 843 |
N/A |
Vehicle moved during KOER |
Aborts KOER Test |
N/A |
| 844 |
N/A |
Invalid CCT test - pedal movement |
Aborts KOER Test |
N/A |
| 845 |
PCED |
B+. volt too low for CCT test |
Aborts KOER Test |
Charging system problem/load, glow
plugs still enabled |
| 846 |
N/A |
Aborted KOER, ICP Failure |
Detected sensor circuit fault
Aborts KOER test |
See codes 153, 154, 155, 546, 841 |
| 847 |
EOT |
EOT above KOER limits 242°F(117°C) |
Aborts KOER test |
Engine overheating, stuck thermostat,
biased sensor |
| 863 |
PBA |
PBA parking brake applied fail |
Switch Test - KOER |
Open/short circuit., Switch/PCM
failure, failed to activate switch KOER. |
| 864 |
PBA |
Brake applied switch fail |
Switch Test - KOER (Code set if
cruise not present) |
| 865 |
PCM |
Processor entered HLOS mode |
|
Defective PCM |
| 911 |
N/A |
IDM No faults detected |
Pass Code for Injector Driver Module &
inj. circuitry. |
N/A |
| 915 |
PCM/IDM |
CID stuck high |
Cyl. identification line stuck high
(historical fault only) |
CID circuit open, most likely on
intermittent basis |
| 916 |
PCM/IDM |
CID stuck low |
Cyl. identification line stuck low
(historical fault only) |
CID circuit short to ground, most
likely intermittent only |
| 921 - 928* |
INJ |
Low side short to grd. inj. crkt.
#1-#8 |
FMEM mode, engine will run on 4 cyl. |
Harness short to ground |
| 931 - 938 |
INJ |
Low side short to bat. inj. crkt.
#1-#8 |
|
Miswired connector or harness |
| 941 - 948 |
INJ |
Cylinder fault #1thru#8 - CCT |
Cylinder not contributing during CCT
test |
Power cylinder, valve train or
injector problem |
| 955 |
PCM/IDM |
CID circuit failure |
Cyl. identification circuit -OCC check
-KOEO only |
Open/grounded circuit, faulty IDM |
| 956 |
PCM/IDM |
FCDS circuit failure |
Fuel demand command signal -OCC check
-KOEO |
Open/grounded circuit, faulty IDM |
| 961 - 968 |
INJ |
High to low side short cyl#1 - #8 |
Bank with fault will be commanded off |
Short circuit, shorted injector,
failed IDM |
| 971 - 978 |
INJ |
High to low side open cyl#1 - #8 |
Bank with fault will be commanded off |
Open circuit, Open injector,
failed IDM |
| 983 |
PCM/IDM |
PCM-IDM diag. communication error |
Communication on EF (Electronic
Feedback line) |
Open/shorted EF or FDCS wire, open IDM
grd. |
| 988 |
PCED |
IDM failure |
|
Internal IDM failure |
| 991 |
INJ |
High side #1(right)short to grd or B+ |
Inj. power supply circuit short
(operate on 4 cylinders) |
Shorted circuit, faulty IDM |
| 992 |
INJ |
High side #2(left) short to grd or B+ |
Inj. power supply circuit short
(operate on 4 cylinders) |
Shorted circuit, faulty IDM |
| 993 |
INJ |
High side open left group |
Inj. power supply circuit open
(operate on 4 cylinders) |
Open circuit, faulty IDM |
| 994 |
INJ |
High side open right group |
Inj. power supply circuit open
(operate on 4 cylinders) |
Open circuit, faulty IDM |
| 995* |
INJ |
Multiple faults on bank #1(right) |
Fix low side short and run diagnostics |
Miswired connector or harness, short
to ground |
| 996* |
INJ |
Multiple faults on bank #2(left) |
Fix low side short and run diagnostics |
Miswired connector or harness, short
to ground |
| 997 |
INJ |
High sides shorted together |
|
Shorted wires, faulty IDM |
