Transmission

P0984 — Shift Solenoid E Control Circuit Range/Performance

Severity: medium Drive with care, to a shop

What P0984 means

The transmission control module (TCM, or the PCM on some vehicles) commands shift solenoid E and then checks the result using pressure, slip and gear ratio feedback. When the actual response does not match the command, it sets P0984. The wiring may look fine, because the cause is often mechanical or hydraulic.

Symptoms

  • Engine flare between shifts
  • Harsh or delayed shifting
  • Transmission limp mode
  • Check Engine or transmission warning light on
  • Certain gears not available
  • Poor acceleration and worse fuel economy

Possible causes

  1. Failed or stuck shift solenoid E
  2. Dirty, old or degraded transmission fluid
  3. Low fluid level
  4. Clogged filter or valve body passages
  5. Damaged wiring, poor connection or corroded connector
  6. TCM calibration or software issue
  7. Faulty control module (ECM, PCM or TCM)

How to diagnose

  1. Scan all codes and review freeze frame data for other transmission faults
  2. Check fluid level and condition: color, smell and metal debris
  3. Inspect the transmission harness and connector for chafing, moisture and corrosion
  4. Measure solenoid E resistance and compare it with factory specification
  5. Check power and ground at the solenoid circuit and test wiring continuity to the module
  6. Run a scan tool solenoid actuation test and watch the response
  7. Look for TCM software updates or technical service bulletins
  8. Drop the pan and inspect the filter and valve body

Common fixes

  • Change the transmission fluid and filter
  • Replace solenoid E or the solenoid pack
  • Repair the wiring or connector
  • Clean or rebuild the valve body
  • Update or reprogram the TCM
  • Replace the control module if confirmed faulty

Questions and answers

What does P0984 mean?

The transmission control unit detected that shift solenoid E is not working as commanded. The cause can be the solenoid, fluid, wiring or the valve body.

Can I drive with P0984?

Only carefully and for a short distance, such as to a shop. The transmission may enter limp mode, and slipping can damage internal parts.

Will a fluid change fix P0984?

If the fluid is dirty or low, it may fix the problem or at least rule out a common cause. If the solenoid has failed, it will need to be replaced.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.