Unicarriers Forklift Error Codes

UniCarriers is the owner of both the Nissan and TCM forklift brands. If you're searching for Unicarriers forklift error codes, refer to the following lists of faults and their solutions for each of these brands.

Nissan forklift error codes

Below are the error codes for Nissan forklifts.

E-03, E-04, E-07:
Can bus malfunction. Check power and ground at VCM, ECM, and M/P. Inspect for poor or disconnected cables and check for corrosion on the Maintenance (OBD-II) connector.

E-21:
Mass Air Flow sensor. Check for broken wires or loose connections.

E-22: Water Temperature sensor. Inspect for broken wires or loose connections. This involves the two-wire sensor connected to the ECM.

E-23: Throttle sensor. Verify a 5-volt power supply from the ECM to the throttle body. Confirm the ETC relay power to the ECM and check for corrosion in the ETC relay box. Manipulate individual wires to ensure proper connectivity.

E-24:
Accelerator sensor. Triggered when voltage is out of range, often due to low voltage at idle. Perform the two “key learns.”

E-25: O2 sensor. This indicates a malfunction in the sensor circuit signal.

E-26: O2 sensor heater. The heater circuit signal is malfunctioning.

E-27:
Crankshaft Position sensor. If there's an extended crank, verify that the fuel pressure is correct; otherwise, it’s likely the sensor. If there's no extended crank, but the engine runs rough or is missing, check spark plugs, coil packs (individually and as a set), and sensor connections.

E-28:
Camshaft Position sensor. This should result in a "no start" due to a faulty sensor.

E-29: LPG Fuel Cut circuit malfunction. Inspect the Main “C” relay.

E-30: ECM circuit malfunction. If the truck has an emergency stop switch, verify its operation and connections. Ensure the main chassis ground is secure and free of paint. Check power and ground at the ECM and reseat the ECM connectors. If necessary, swap the ECM with one from a known functional truck to determine if the code follows the swap.

E-31: Electronic Throttle Control actuator circuit malfunction. Inspect the ETC relay for corrosion or water intrusion in the relay box.

E-32: Engine Coolant overheat (Step 1). The sensor detected a coolant temperature of 230°F or higher. Possible causes include a dirty radiator, excessive pallet pushing, or improper adjustment of the inching pedal.

E-33: Engine Coolant overheat (Step 2). The coolant temperature sensor recorded a temperature of 275°F or higher.

E-34: Ignition Signal circuit malfunction. This error indicates no voltage at the ignition coil. Verify that 12 volts are present on the green wire at each coil. Swap coil positions and retest. If the fault moves, the coil is faulty; if the fault remains, the spark plug or ECM is the issue.

E-35: LPG Fuel Injection circuit malfunction. Typically, this indicates high resistance or corrosion. Check the Main LPG Injector and inspect the 5-amp fuse on the injector holder assembly.

E-36: LPG Fuel Pressure sensor. Look for broken wires or loose connections.

E-38: LPG Vaporizer malfunction, often due to high pressure. Start by checking the vaporizer.

E-40: Oil Pressure sensor. This sensor is monitored by the Meter Panel and does not trigger a visible fault.

E-41: Stop Lamp Switch malfunction. Ensure the Stop Lamp Switch is adjusted properly, even if the truck doesn’t have tail light assemblies. For L01/L02 models, hold the brake pedal down while clearing the fault code.

E-42: Gasoline Air/Fuel Ratio malfunction. This error relates to a "full rich" or "full lean" fuel mixture condition.

E-43: LPG Air/Fuel Ratio malfunction. Similar to gasoline, this error involves the fuel mixture condition. When the ignition is in the "On" position, check if LPG fuel pressure is stable. If running, check the Air/Fuel Alpha display and O2 sensor voltage. Other possible issues include a clogged last-chance filter, stuck main LPG injector, or intake leak.

E-44: Atmospheric Pressure sensor. Inspect for broken wires or loose connections.

TCM forklift error codes

Below are the error codes for TCM forklifts.

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