E-Codes are foe ECM or engine control faults.
F-Codes are for VCM or vehicle control faults.
P-Codes are for meter panel or display detection faults.
Although these codes are listed for the Caterpillar P5000, they will apply to any forklift with a Nissan K21 or K25 engine. P stands for Pnuematic. C stands for Cushion.
| Error Code | Explanation | Error Code | Explanation | Error Code | Explanation |
| E03 | VCM communication error | F02 | Battery voltage error | F57 | Tilt backward solenoid error |
| E04 | ECM communication error | F03 | VCM communication error | F59 | Tilt solenoid leak |
| E05 | DCM communication error | F04 | ECM communication error | F60 | Attach-1A solenoid error |
| E06 | HST communication error | F05 | DCM communication error | F62 | Attach-1B solenoid error |
| E07 | MP communication error | F06 | HST communication error | F64 | Attach 1 solenoid leak |
| E08 | TMS communication error | F07 | MP communication error | F65 | Attach-2A solenoid error |
| E21 | Air flow meter error signal | F08 | TMS communication error | F67 | Attach-2B solenoid error |
| E22 | Water temperature sensor error signal | F10 | Lift lever neutral error | F69 | Attach 2 solenoid leak |
| E23 | Throttle sensor error signal | F11 | Tilt lever neutral error | F70 | Attach-3A solenoid error |
| E24 | Accelerator sensor error signal | F12 | Attach-1 lever neutral error | F72 | Attach-3B solenoid error |
| E25 | O2 sensor error signal | F13 | Attach-2 lever neutral error | F74 | Attach-3 solenoid leak |
| E26 | O2 sensor heater error signal | F14 | Attach-3 lever neutral error | F75 | Unload solenoid error |
| E27 | POS sensor error signal | F16 | Shift lever error | F77 | Lift lock solenoid error |
| E28 | Phase sensor error signal | F17 | Speed error | F79 | Unload solenoid leak |
| E29 | Self shutdown system diagnostic result error signal | F20 | Lift lever error | F80 | Knob position solenoid error |
| E30 | ECC C/U error signal | F22 | Tilt lever error | F82 | Tilt lock solenoid error |
| E31 | Electronic control throttle control error signal | F24 | Attach-1 lever error | F84 | Knob position solenoid leak |
| E32 | Overheat signal (step 1) | F26 | Attach-2 lever error | F85 | T/M forward solenoid error |
| E33 | Overheat signal (step 2) | F28 | Attach-3 lever error | F87 | T/M backward solenoid error |
| E34 | Spark system error signal | F30 | Main oil pressure sensor error | F89 | T/M solenoid leak |
| E35 | LPG F/INJ disconnection diagnostic result signal | F32 | Lift oil pressure sensor error | ||
| E36 | LPG fuel pressure sensor diagnostic result signal | F34 | Speed sensor error | P03 | VCM communication error |
| E37 | LPG fuel temperature sensor diagnostic result signal | F36 | Tire angle sensor error | P04 | ECM communication error |
| E38 | LPG vaporizer diagnostic result signal | F38 | Tilt angel sensor error | P05 | DCM communication error |
| E39 | Mast-high SW diagnostic result signal | F40 | Steering error | P06 | HST communication error |
| E40 | Oil pressure sensor diagnostic result signal | F50 | Lift up solenoid error | P07 | MP communication error |
| E41 | Stop lamp SW error signal | F52 | Lift down solenoid error | P08 | TMS communication error |
| F54 | Lift solenoid leak | P22 | Shift lever error signal | ||
| F01 | Memory check error | F55 | Tilt forward solenoid error |