Transmission Fluid Pressure Sensor Circuit Intermittent
The P0996 code indicates an intermittent fault in the transmission fluid pressure sensor circuit. This sensor monitors hydraulic pressure inside the transmission and sends a signal to the PCM. An intermittent circuit issue can cause erratic shifting, delayed engagement, or limp mode. The problem may stem from a faulty sensor, damaged wiring, or poor electrical connections.
01. Most Common Causes
- Faulty transmission fluid pressure sensor
- Damaged or corroded wiring/connectors
- Intermittent short or open in the circuit
- Low or contaminated transmission fluid
02. Symptoms You Will Notice
- Erratic or harsh shifting
- Delayed gear engagement
- Transmission slipping
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition.
Step 3: Visually check wiring and connectors for damage or corrosion.
Step 4: Test sensor resistance and voltage with a multimeter per manufacturer specs.
Step 5: Perform a wiggle test on wiring while monitoring sensor signal.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as intermittent sensor issues can lead to transmission damage or sudden failure. Limp mode may limit speed and damage components.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts (sensor $50-$150) and labor ($100-$250). Wiring repairs may cost less.