U0984 Code:

OBD-II Diagnostic Network (U) Trouble Code

Possible Cause

Common cause for U0984 is the valve is controlled by the PCM (or a similar controller) using inputs from sensors and other controllers in the controller area network (CAN). The CAN represents a communication bus that allows multiple microcontrollers.

Common Symptoms

  1. These interruptions are received by the PCM as square waveform patterns of varying degrees of voltage and translated into transmission output speed
  2. Look for shorted or burned wiring and replace circuitry and connectors as required
  3. Many scanners will permit the technician to retrieve these alpha numeric numbers (or codes) prior to controller replacement
  4. To perform a thorough diagnosis, any transmission leaks should be repaired and the transmission should be filled with the proper amount and type of fluid (if the fluid smells really "burnt" and you are experienced enough to detect it, you may go ahead and condemn the transmission)

Similar Problems

IC Module 4X Ref Circuit Intermittent, No Pulses
TP Sensor Learn Not Complete
Transmission Control Module Reprogrammable Memory

U0984 Troubleshooting

When you put your foot down on the brakes you expect your car to quietly slow down and come to a stop. The power your foot applies on the brake pedal is assisted by hydraulic pressure. Your foot's force engages a piston and caliper with brake pads attached (bonded abrasive and heat resistance metal or ceramic) to put pressure on the rotor. U0984 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

How to turn off U0984 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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