B1782 Code:

OBD-II Diagnostic Body (B) Trouble Code

Possible Cause

Common causes of B1782 include four-wheel drive switch or actuator failures. Other causes include faulty sensors, solenoids, or switches, and defective wiring harnesses and connectors.

Common Symptoms

  1. Exhaust after treatment fuel injector systems are used exclusively in diesel applications. Exhaust after treatment fuel injector systems use either water, a chemical agent, air, or a combination of the three to reduce exhaust emissions in automotive applications by reducing exhaust temperature and/or exhaust pressure in the diesel particulate filter or catalytic converter assembly
  2. Unlike other diagnostic codes, this type of code can sometimes be best left to a professional simply because of the bulk of circuitry involved
  3. Typical causes of low pump pressure include clogged hydraulic passages, a defective pump, faulty shift solenoids, or a faulty electronic pressure regulator
  4. Typical causes of low pump pressure include clogged hydraulic passages, a defective pump, faulty shift solenoids, or a faulty electronic pressure regulator

Similar Problems

Vehicle Speed Control And Idle Control System
TP Sensor Learn Not Complete
Cruise Control System - Vehicle Accel Too High

B1782 Troubleshooting

White smoke means that the fuel that is being injected into the combustion chamber is not being burned properly. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time and work correctly. Parts or components should not be replaced with reference to only a B1782 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

How to turn off B1782 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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