Q: What does Hitachi fault code 0168-02 mean?

0168-02 (Electrical): Multiple Random Sensor Errors on DLU Fix: LOGIC: System Battery Supply Voltage Ripple Exceeds Limit. ACTION: Perform an AC ripple voltage test on the main 24V brushless alternator output (must be <0.5V AC). Check for failed internal alternator rectifier diodes or loose battery studs.

Q: What does Hitachi fault code 10042-12 (SPN 5246 FMI 12) mean?

10042-12 (SPN 5246 FMI 12): Red "Stop Engine" lamp; Immediate or timed engine derate; 5 MPH/Low Idle lock. Fix: SCR Operator Inducement - Internal Component Failure. LOGIC: This is a "Critical Inducement." The machine's DCU (Dosing Control Unit) or the Engine ECM has detected a severe internal error or a long-standing emissions violation that has timed out. ACTION: 1. Use MPDr. (Hitachi Service Tool) to check for "Root" codes like NOx sensor or DEF Pump failures. 2. Check the DCU main power relay. 3. Inspect the communication (CAN) link between the engine and the SCR controller. FIX: Address the underlying SCR hardware failure (Pump, Doser, or Sensor); perform an "Inducement Reset" using the service tool to unlock the machine.

Q: What does Hitachi fault code 10520-12 mean?

10520-12: Red "Stop Engine" lamp; Machine limited to Low Idle or 5 MPH; "DEF Quality" error on display. Fix: Urea (DEF) Quality Sensor - Internal Component Failure. LOGIC: The ultrasonic sensor inside the DEF tank is not communicating correctly with the DCU, or the internal "checksum" of the sensor's data is corrupted. ACTION: 1. Check the 4-pin connector on top of the DEF tank header. 2. Verify 24V power and Ground to the sensor. 3. Check CAN-High and CAN-Low resistance (60 ohms). FIX: Replace the DEF Tank Header/Quality Sensor Assembly and perform an "Emissions Trip Reset" via MPDr. software.

Q: What does Hitachi fault code 11100-2 mean?

11100-2 (Engine Control): Engine Stalling / No Start. Fix: LOGIC: Abnormal Engine Speed signal. ACTION: Check the Crankshaft and Camshaft speed sensors. If the sensors are clean, perform a "Tug Test" on the sensor harness near the starter.

Q: What does Hitachi fault code 11100-2 mean?

11100-2: Engine Stumbles. Fix: LOGIC: Engine Speed (Crank) Sensor signal erratic. ACTION: Check sensor resistance (typ. 100-200 Ohms) and harness shielding.

Q: What does Hitachi fault code 11200-3 mean?

11200-3 (Hydraulics (Pump 1)): Hydraulic Lag / Slow Lift. Fix: LOGIC: Pump 1 Delivery Pressure Sensor High Voltage. ACTION: Swap P1 and P2 sensors to see if the code moves. If it stays at P1, check the 5V reference in the monitor's diagnostic mode.

Q: What does Hitachi fault code 11301-3 mean?

11301-3 (Hydraulics): Slow Boom Lift / HP Mode Dead Fix: LOGIC: Boom Raise Pilot Pressure Sensor High Voltage Abnormality. ACTION: Inspect pilot line sensor harness for a short to 5V reference. Check main control valve spool travel and verify true pilot pressure at the base manifold block tap.

Question 1

What does Hitachi fault code 0164-02 mean?

Accepted Answer

0164-02 (Fuel System): White Exhaust Smoke / Hard Start Fix: LOGIC: High Pressure Common Rail Fuel Delivery Data Irrational.

ACTION: Check low-pressure lift pump delivery pressure (>3.5 bar). Perform high-pressure rail leak-down test with scan tool to pinpoint a leaking mechanical fuel pressure relief valve (PRV).

Question 2

What does Hitachi fault code 0164-11 mean?

Accepted Answer

0164-11 (Fuel Injection / HEUI): Engine Sluggish / Hard Start Hot Fix: LOGIC: Injection Actuation Pressure (IAP) Mechanical Performance Error.

ACTION: Measure actual hydraulic injection actuation pressure against commanded pressure with a mechanical gauge. Inspect IAP control valve spool for scoring or debris sticking.

Question 3

What does Hitachi fault code 0167-01 mean?

Accepted Answer

0167-01 (Electrical): Alternator Lamp / Sensor Drift Fix: LOGIC: Alternator Charging Output Potential Critically Low (<22.5V).

ACTION: Measure output voltage directly on the alternator B+ post under full cabin AC and high-draw mining light load. Inspect the 24V master battery isolator contacts for high-resistance voltage drops.

Question 4

What does Hitachi fault code 0168-02 mean?

Accepted Answer

0168-02 (Electrical): Multiple Random Sensor Errors on DLU Fix: LOGIC: System Battery Supply Voltage Ripple Exceeds Limit.

ACTION: Perform an AC ripple voltage test on the main 24V brushless alternator output (must be <0.5V AC). Check for failed internal alternator rectifier diodes or loose battery studs.

Question 5

What does Hitachi fault code 10042-12 (SPN 5246 FMI 12) mean?

Accepted Answer

10042-12 (SPN 5246 FMI 12): Red "Stop Engine" lamp; Immediate or timed engine derate; 5 MPH/Low Idle lock. Fix: SCR Operator Inducement - Internal Component Failure.

LOGIC: This is a "Critical Inducement." The machine's DCU (Dosing Control Unit) or the Engine ECM has detected a severe internal error or a long-standing emissions violation that has timed out.

ACTION: 1. Use MPDr. (Hitachi Service Tool) to check for "Root" codes like NOx sensor or DEF Pump failures. 
2. Check the DCU main power relay. 
3. Inspect the communication (CAN) link between the engine and the SCR controller.

FIX: Address the underlying SCR hardware failure (Pump, Doser, or Sensor); perform an "Inducement Reset" using the service tool to unlock the machine.

Question 6

What does Hitachi fault code 10520-12 mean?

Accepted Answer

10520-12: Red "Stop Engine" lamp; Machine limited to Low Idle or 5 MPH; "DEF Quality" error on display. Fix: Urea (DEF) Quality Sensor - Internal Component Failure.

LOGIC: The ultrasonic sensor inside the DEF tank is not communicating correctly with the DCU, or the internal "checksum" of the sensor's data is corrupted.

ACTION: 1. Check the 4-pin connector on top of the DEF tank header. 
2. Verify 24V power and Ground to the sensor. 
3. Check CAN-High and CAN-Low resistance (60 ohms).

FIX: Replace the DEF Tank Header/Quality Sensor Assembly and perform an "Emissions Trip Reset" via MPDr. software.

Question 7

What does Hitachi fault code 11100-2 mean?

Accepted Answer

11100-2 (Engine Control): Engine Stalling / No Start. Fix: LOGIC: Abnormal Engine Speed signal.

ACTION: Check the Crankshaft and Camshaft speed sensors. If the sensors are clean, perform a "Tug Test" on the sensor harness near the starter.

Question 8

What does Hitachi fault code 11100-2 mean?

Accepted Answer

11100-2: Engine Stumbles. Fix: LOGIC: Engine Speed (Crank) Sensor signal erratic.

ACTION: Check sensor resistance (typ. 100-200 Ohms) and harness shielding.

Question 9

What does Hitachi fault code 11200-3 mean?

Accepted Answer

11200-3 (Hydraulics (Pump 1)): Hydraulic Lag / Slow Lift. Fix: LOGIC: Pump 1 Delivery Pressure Sensor High Voltage.

ACTION: Swap P1 and P2 sensors to see if the code moves. If it stays at P1, check the 5V reference in the monitor's diagnostic mode.

Question 10

What does Hitachi fault code 11301-3 mean?

Accepted Answer

11301-3 (Hydraulics): Slow Boom Lift / HP Mode Dead Fix: LOGIC: Boom Raise Pilot Pressure Sensor High Voltage Abnormality.

ACTION: Inspect pilot line sensor harness for a short to 5V reference. Check main control valve spool travel and verify true pilot pressure at the base manifold block tap.

Code	System	Symptom	Full fix
0164-02	Fuel System	White Exhaust Smoke / Hard Start	View fix
0164-11	Fuel Injection / HEUI	Engine Sluggish / Hard Start Hot	View fix
0167-01	Electrical	Alternator Lamp / Sensor Drift	View fix
0168-02	Electrical	Multiple Random Sensor Errors on DLU	View fix
10042-12 (SPN 5246 FMI 12)	—	Red "Stop Engine" lamp; Immediate or timed engine derate; 5 MPH/Low Idle lock.	View fix
10520-12	—	Red "Stop Engine" lamp; Machine limited to Low Idle or 5 MPH; "DEF Quality" error on display.	View fix
11100-2	Engine Control	Engine Stalling / No Start.	View fix
11100-2	—	Engine Stumbles.	View fix
11200-3	Hydraulics (Pump 1)	Hydraulic Lag / Slow Lift.	View fix
11301-3	Hydraulics	Slow Boom Lift / HP Mode Dead	View fix
11301-3	Pilot Control	Slow Swing / Swing Alarm ON.	View fix
11302-4	Hydraulics	Bucket Curl Slow / Power Slump	View fix
11303-3	Hydraulics	Arm In / Roll Function Slow	View fix
11304-3	Hydraulics	Bucket Dump Function Sluggish	View fix
11401-2	Hydraulics (Torque)	Engine Bogging / No Torque.	View fix
11901-3	Hydraulics (Temp)	Limp Mode / Overheating.	View fix
15501-2	—	Limp Mode.	View fix
2001-01	—	Engine Cranks/No Start.	View fix
E:11	—	No Move / Dead Levers.	View fix
P1211	Electrical / Injectors	Engine Drops Cylinders / Rattles Loudly	View fix
W:1304	—	Hydraulic Slowdown.	View fix
W:1502	—	Pump Noise/Surge.	View fix

Hitachi Fault Codes

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