Caterpillar Forklift Error Codes
Replacement components for all types of Caterpillar forklifts
Looking for Caterpillar forklift error codes? Scan down the columns for information.
See also: How to clear CAT forklift error codes.
| Error Code | Code Meaning | Advice |
|---|---|---|
| E03 | VCM communication error | To fix the E-03 VCM Communication Error: Check fuses. Next disconnect the battery. Hold the positive and negative cable ends together for a moment, then reconnect to see if code clears. Could be a poor connection in the wire harness or at the VCM. Damage to a wire in the harness is possible. |
| E04 | ECM communication error | Start with the fuses: ensure they're intact. Next, assess the battery's charge; ideally, it should register over 14 volts at idle. Investigate the alternator and related wiring for anomalies. Check connections for debris or corrosion. If encountering error codes, attempt a reset by briefly disconnecting and reconnecting battery cables. |
| E05 | DCM communication error | Problem with the Data Communication Module, which facilitates communication between the forklift's electronic components. Causes can include faulty wiring, a malfunctioning DCM, or external interruptions. |
| E06 | HST communication error | Indicates an error with Hydrostatic Transmission system. Run a diagnostic test to pinpoint the problem. Ensure the wiring and connections are intact and undamaged. Inspect and possibly replace the HST module. Update the software and reset the system by toggling the battery connection. |
| E07 | MP communication error | Signifies a disruption with the Main Processor. To address this, use diagnostic tools to identify the cause. Inspect and repair any compromised wiring or connections, and assess the Main Processor for potential replacement or updates. |
| E08 | TMS communication error | Points to communication issues within the Transmission Management System (TMS). Use diagnostic tools to identify the underlying cause. Then inspect all wiring and connections linked to the TMS for any damages or loose connections. If the hardware appears intact, consider checking the software aspects of the TMS for updates or inconsistencies. |
| E21 | Air flow meter error signal | Possible faulty airflow meter. Issues may also stem from wiring at the connector, which is replaceable. |
| E22 | Water temperature sensor error signal | Check the wiring and connection to engine temperature sensor. Also, ensure the sensor is working. |
| E23 | Throttle sensor error signal | Obstruction between the connection and the motor, so it is crucial to check cables to ensure they are undamaged and clean. |
| E24 | Accelerator sensor error signal | Issues within the throttle sensor circuit. Might be malfunctioning throttle sensor, compromised wiring, or poor connections in the throttle's electrical system. |
| E25 | O2 sensor error signal | Signifies problems related to the lift truck's system voltage. Triggered by an overvoltage or undervoltage condition. May be a malfunctioning alternator, a failing battery, or issues within the electrical system. |
| E26 | O2 sensor heater error signal | Disconnect the battery cables and touch them together for a minute. Reconnect them and check if the code persists. |
| E27 | POS sensor error signal | Check the spark plug and replace. If code persists, check/replace the lift truck's coil packs. |
| E28 | PHASE sensor error signal | Indicates malfunction or disruption related to the phase sensor, which monitors the forklift's rotational aspects. Use diagnostic tools to gain understanding of the sensor's condition. Examine the phase sensor for damage. Also, look at associated wiring and connections for breaks or disconnections. In cases where the hardware appears functional, it might be beneficial to check for potential software glitches or calibration errors related to the sensor. |
| E29 | Self shutdown system diagnostic result error signal | Points to issues with the forklift's automated shutdown system, a crucial feature for ensuring operational safety. Use diagnostic tools for understanding of the exact cause. Inspect the system's components, wiring, and connections, ensuring they're intact and free from damage. Software glitches or misconfigurations can also trigger this error. Verify the system's software is up-to-date and correctly calibrated. |
| E30 | ECCS C/U error signal | Issue with the Electronic Concentrated Control System's Central Unit. To troubleshoot, use specialized diagnostic tools to identify the problem. Examine the system's wiring and connections for damages and ensure the software is updated. |
| E31 | Electronic control throttle control error signal | Evaluate the throttle's sensors, actuators, and associated wiring for visible signs of wear or damage. Check the electronic control unit's software, ensuring it's up-to-date and functioning well. A system reset or recalibration might be needed. |
| E32 | Overheat signal (STEP 1) | Signals elevated temperatures beyond safe limits. Power down the forklift, allowing it to cool. Conduct inspection of the cooling system to identify potential blockages or malfunctions. Equally vital is ensuring the forklift operates in a well-ventilated environment. Checking the thermostat and temperature sensor to rule out false alarms or pinpoint further issues. |
| E33 | Overheat signal (STEP 2) | Signals advanced overheating. Immediately halt operations and let the machine cool. Inspect the cooling system, ensuring the radiator is clear, and assess the coolant's quality. Check the thermostat and temperature sensors for accurate function. Review the operating environment for adequate ventilation and inspect other key components like the transmission. |
| E34 | Spark system error signal | Indicates a malfunction in the spark ignition system. Examine the spark plugs for wear, damage, or carbon build-up, replacing them if necessary. The ignition coils and spark plug wires should also be inspected for any visible damage or wear; faulty components can disrupt the electrical current, leading to ignition failures. Ensure that the ignition module, responsible for timing and distribution of the spark, functions optimally. Using diagnostic tools can offer a precise fault identification. Moreover, ensure the forklift's software is up-to-date, as outdated firmware can sometimes contribute to such errors. |
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