What does Mitsubishi fault code P0502 mean?

Q: What does Mitsubishi fault code P0502 mean?

P0502 indicates: Speedometer reads zero; "ABS" light on; Transmission won't shift out of 1st gear. Fix: Vehicle Speed Sensor (VSS) Low Input. LOGIC: The ECU has lost the pulse signal from the transmission speed sensor or the ABS module. ACTION: 1. Inspect the sensor on the transfer case/tail-shaft. 2. Check wiring for damage from off-road debris. 3. Check the "Speedo" fuse. FIX: Replace Speed Sensor or repair broken wiring in the chassis harness.

Mitsubishi Fault Code

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P0502

Speedometer reads zero; "ABS" light on; Transmission won't shift out of 1st gear.

System

Not specified

Symptom

Speedometer reads zero; "ABS" light on; Transmission won't shift out of 1st gear.

Diagnosis & fix steps

Vehicle Speed Sensor (VSS) Low Input. LOGIC: The ECU has lost the pulse signal from the transmission speed sensor or the ABS module. ACTION: 1. Inspect the sensor on the transfer case/tail-shaft. 2. Check wiring for damage from off-road debris. 3. Check the "Speedo" fuse. FIX: Replace Speed Sensor or repair broken wiring in the chassis harness.

Red Seal field insights

On 4WD models, the wiring to the speed sensor is often snagged by brush or mud. Look for "tug" damage near the connector at the back of the gearbox.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

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Read before you touch anything

This is general reference information, not a repair manual. It is for trained, qualified technicians.
Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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