Glow Plug/Heater Indicator Circuit Malfunction
Table of contents
P0381 ISUZU Possible Causes
- Faulty Glow Plug
- Glow Plug harness is open or shorted
- Glow Plug circuit poor electrical connection
How do I fix code P0381 ISUZU?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0381 ISUZU code
The cost of diagnosing the P0381 ISUZU code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
– The glow plugs are commanded OFF and the glow plug feedback is more than 2 volts. or
– The glow plugs are commanded on and the glow plug feedback is not between 5 volts and 6.2 volts.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- The engine may be harder to start
P0381 ISUZU Description
The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The engine control module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight inpidual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, DTC P0380 will set.