Shift Solenoid 'E' Control Circuit Range/Performance
The P0984 code indicates that the Powertrain Control Module (PCM) has detected a performance or range issue in the control circuit of shift solenoid 'E'. This solenoid is responsible for directing hydraulic fluid to engage specific gears in the automatic transmission. The PCM monitors the solenoid's electrical response; if the actual current or voltage deviates from expected values, this code sets. Common causes include a faulty solenoid, wiring issues, or a malfunctioning PCM.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission stuck in a single gear (limp mode)
- Decreased fuel economy
- Delayed engagement when shifting into drive or reverse
2. Most Common Causes
- Faulty shift solenoid 'E' (open or shorted coil, or resistance out of spec)
- Damaged, corroded, or shorted wiring in the solenoid circuit
- Solenoid connector with bent pins, corrosion, or poor contact
- Excessive circuit resistance due to poor splices or ground
- Internal failure of the transmission control module (TCM) or powertrain control module (PCM)
- Mechanical blockage in the solenoid valve preventing full movement
- Low or degraded transmission fluid level or condition
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition; top off or replace if necessary.
Step 3: Visually check wiring and connectors for damage, corrosion, or loose connections.
Step 4: Test solenoid 'E' resistance with a multimeter; compare to manufacturer specs.
Step 5: Perform a solenoid actuation test using a scan tool to verify operation.
Step 6: If all else passes, check for PCM software updates or replace PCM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The transmission may enter limp mode, limiting speed and potentially causing further damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary: solenoid replacement $150-$300, wiring repair $100-$200, PCM replacement $500-$1000. Diagnostic fees are typically $100-$150.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.