Shift Solenoid Control Circuit High
The P0983 code indicates that the transmission control module (TCM) has detected a high voltage condition in the control circuit of shift solenoid 'D' (or a specific solenoid depending on the vehicle). This solenoid is responsible for directing hydraulic fluid to engage specific gears. A high voltage reading typically points to a short to power, a faulty solenoid, or an internal TCM issue. This can cause erratic shifting, harsh engagement, or transmission slippage.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission stuck in a single gear (limp mode)
- Decreased fuel economy
2. Most Common Causes
- Short to power in the solenoid circuit
- Faulty shift solenoid
- Damaged wiring or connector
- Internal transmission control module failure
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect wiring and connectors for damage, corrosion, or shorts.
Step 3: Test solenoid resistance with a multimeter (compare to specs).
Step 4: Check for power and ground at the solenoid connector with key on.
Step 5: If wiring and solenoid are good, suspect TCM failure.
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 causing potential internal damage.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on whether it's a simple wiring fix or solenoid replacement. TCM replacement can be more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.