Low, degraded or contaminated transmission fluid; Damaged wiring, chafed loom or corroded connector between the solenoid and the control unit; Faulty or sticking shift solenoid E (electrical or mechanical); Blocked internal passages or debris in the valve body causing the solenoid to perform poorly; Low battery voltage or poor earth affecting the solenoid supply; Faulty transmission control unit or mechatronic unit; Outdated control unit software where a known fault exists for that model.

P0984

Shift Solenoid E Control Circuit Range/Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
9: AreaTransmission
84: FaultThe specific fault in that area

What it means

P0984 is the generic code for a range or performance fault in the control circuit of shift solenoid E in the automatic transmission. The transmission control unit commands the solenoid and monitors the circuit, and it has seen a result that does not match the command or falls outside the expected range. Which gear or function solenoid E controls depends on the model and transmission.

Symptoms

Harsh, delayed or flared gear changes
Transmission stuck in one gear (limp mode)
Gearbox slipping or failing to select certain gears
Warning light on and possible transmission warning message
Poor fuel economy or reduced performance

Possible causes

Low, degraded or contaminated transmission fluidlikely
Damaged wiring, chafed loom or corroded connector between the solenoid and the control unitlikely
Faulty or sticking shift solenoid E (electrical or mechanical)likely
Blocked internal passages or debris in the valve body causing the solenoid to perform poorlypossible
Low battery voltage or poor earth affecting the solenoid supplypossible
Faulty transmission control unit or mechatronic unitrare
Outdated control unit software where a known fault exists for that modelrare

How to diagnose

Read all stored codes and freeze frame data, noting transmission temperature, gear and road speed when the fault set
Check the transmission fluid level and condition (where a dipstick or check procedure exists) and compare against the manufacturer's specification
Check battery condition and charging voltage, and inspect main earths
Inspect the wiring loom and connectors to the solenoid and control unit for chafing, heat damage, water ingress and corrosion
Measure the solenoid resistance and compare with the manufacturer's specification, and check for shorts to earth or supply on the circuit
Use live data to command the solenoid and watch the response, and compare gear ratios and slip figures
Inspect the pan and filter for debris or clutch material, if the fluid check suggests wear
Check for relevant technical bulletins or software updates for the specific model and transmission

How to fix

Correct the fluid level or replace degraded fluid and filter using the specified type
Repair or replace damaged wiring and clean or replace corroded connectors
Replace the faulty shift solenoid, or the solenoid pack or valve body assembly where it is not supplied separately
Clean or overhaul the valve body and renew the filter if debris is found
Repair the battery or charging system or earth fault if voltage is the issue
Replace or reprogram the control unit, or update the software, only if a fault or outdated calibration is confirmed

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but it may be in limp mode and further use risks damaging the transmission. Book diagnosis soon and avoid heavy loads or towing.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.