Hyster accelerator pedal assembly
Part: Hyster 6502363
Pedal assembly part number listed for code 12 accelerator sensor faults.
$130-$170
Check price
Hyster Forklift Error Codes
Hyster forklifts (S40-H70 series, Fortis, and E-series electric models) use the EV100 display on newer units and a diagnostic LED flash code system on older models. The EV100 display shows numeric codes.
Hyster Powertrain and Engine Codes (1-10)
| Code | Fault | Common Cause | Action |
|---|---|---|---|
| 1 | ECM internal fault | Engine control module failure | Cycle key, replace ECM if persists |
| 2 | Crankshaft position sensor | No crank signal to ECM | Test CPS resistance, wiring |
| 3 | Camshaft position sensor | No cam signal | Test sensor, wiring |
| 4 | Fuel injection circuit | Injector driver fault | Test injector coil resistance |
| 5 | Throttle actuator control | Electronic throttle fault | Test actuator, pedal position sensor |
| 6 | Engine overheat | Coolant temp exceeded limit | Check coolant level, radiator, fan |
| 7 | Low oil pressure | Oil below 10 PSI | Check oil level, pressure sender |
| 8 | Alternator charge fault | Charging voltage out of range | Check belt, alternator output |
| 9 | Glow plug circuit (diesel) | Glow plug or relay failure | Test glow plug resistance 0.5-2 ohms |
| 10 | Fuel pump circuit | Fuel pump or relay fault | Test fuel pump relay, voltage |
Hyster Sensor and Input Codes (11-20)
| Code | Fault | Common Cause | Action |
|---|---|---|---|
| 11 | Accelerator pedal position | Pedal sensor signal low | Check 5V reference, sensor ground |
| 12 | Accelerator pedal position | Pedal sensor signal high | Check sensor wiring for short to battery |
| 13 | Brake switch circuit | Brake switch stuck or failed | Test brake switch continuity |
| 14 | Seat switch circuit | Operator presence sensor | Check seat switch, wiring |
| 15 | Directional control lever | FNR switch fault | Test lever position sensor |
| 16 | Parking brake switch | Brake engaged fault | Check parking brake switch, adjustment |
| 17 | Hydraulic oil temperature | Oil temp sensor out of range | Test oil temp sensor resistance |
| 18 | Transmission fluid temp | Trans oil overtemp | Check trans fluid level, cooler |
Hyster Codes 21+ (Hydraulic and Controller)
| Code | Fault | Common Cause | Action |
|---|---|---|---|
| 21 | Hydraulic pump pressure | Pump pressure out of spec | Check pump, relief valve setting |
| 22 | Lift cylinder position | Height sensor fault | Check sensor, wiring |
| 23 | Tilt cylinder position | Tilt sensor fault | Check sensor, linkage |
| 24 | Attachment circuit | Auxiliary function fault | Check attachment solenoid, wiring |
| 31 | CAN bus communication | Network wiring open/short | Check CAN wiring, terminating resistor |
| 32 | EV100 display fault | Display communication lost | Check display connector, replace |
| 33 | Instrument cluster fault | Cluster communication error | Check cluster wiring, replace |
| 41 | Traction controller (electric) | Motor controller fault | Cycle power, replace if persists |
| 42 | Pump controller (electric) | Pump motor controller fault | Check pump controller, motor |
Most Common Hyster Forklift Faults
Code 12 — Accelerator Pedal Sensor High
The most common Hyster fault code on IC (LP/diesel) forklifts. The electronic throttle pedal sensor sends a 0.5-4.5V signal to the ECM. Code 12 means the signal is stuck high (above 4.5V), which usually means a short to battery voltage at the sensor connector. Water infiltration into the pedal connector is very common on Hyster units used in wash-down environments.
Fix: unplug the pedal connector, inspect for corrosion or water, blow dry with compressed air. Reconnect and retest. If the code clears but returns after rain, replace the pedal assembly (Hyster part 6502363, ~$150) which has a better sealed connector.
Code 6 — Engine Overheat
Hyster IC forklifts overheat most often because the radiator fins are clogged. The radiator is rear-mounted behind the counterweight and packs with debris — warehouse dust, plastic wrap strands, paper. Remove the radiator cover and clean the fins thoroughly with compressed air from the back side. Also check the engine cooling fan — the plastic blades on Hyster engines break off, reducing airflow.
Code 31 — CAN Bus Communication
When the CAN bus network goes down, the EV100 display shows 31 and the forklift may not start or may go to limp mode. On Hyster forklifts, the CAN bus wiring runs through a harness that connects the ECM, display, and transmission controller. The most common failure point is the terminating resistor — a 120-ohm resistor in the CAN harness connector. Test resistance at the CAN connector: it should read 60 ohms between CAN-H and CAN-L (two 120-ohm resistors in parallel). An open reading means one resistor has failed.
Parts Reference
| Part | Part Number | Cost |
|---|---|---|
| Accelerator pedal assembly | Hyster 6502363 | $130-$170 |
| Crankshaft position sensor | Hyster 6573024 | $40-$70 |
| EV100 display | Hyster 6558027 | $400-$700 |
| CAN terminating resistor | Hyster 6501753 | $15-$25 |
| Glow plug (Yanmar engine) | Hyster 6548102 | $15-$25 each |
| Radiator (S40-S70) | Hyster 6524650 | $200-$400 |
Need Replacement Parts?
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