🚛 Isuzu Truck ECU Repair – Exhaust Throttle Solenoid Fault (4HK1, FSS550P)

🚛 Isuzu Truck ECU Repair – 4HK1 Engine (Exhaust Throttle & More)

Models Covered: F-Series (e.g. FSS550P), 4HK1 ECU, multiple Isuzu truck variants

This is a comprehensive ECU repair service for Isuzu trucks equipped with the 4HK1 engine. The most common issue we repair is the Exhaust Throttle Solenoid Fault, which affects engine braking and exhaust valve control. However, we also support a wide range of additional ECU faults that commonly occur in these units.

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Common ECU Faults We Repair:

• Exhaust throttle solenoid failure (loss of engine brake / fault codes)

• Injector driver faults (misfire, injector codes, no start)

• Boost control issues (wastegate solenoid output failure)

• No communication with ECU (CAN or OBD link issues)

• Power supply faults (ECU dead or intermittent)

• Sensor signal driver issues (MAP, rail pressure, throttle position)

• Corrosion or water damage to internal board components

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Service Includes:

• Complete ECU disassembly and inspection

• Identification and repair of all failed internal circuits

• Replacement of output drivers, voltage regulators, or comms transceivers

• Bench testing for signal output, CAN function, and load response

• Cleaning, sealing, and protection against future failure

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Turnaround Time: 2–4 business days
Pricing: By consultation – based on fault type and extent of damage
Applies To: Isuzu F-Series trucks with 4HK1 engine (e.g. FSS550P), compatible ECU part numbers

💡 Restore your original ECU and get back on the road with confidence — fully tested, repaired, and protected.