Transmission Fluid Pressure Sensor/Switch 'A' Circuit Range/Performance
The P0867 code indicates that the Transmission Control Module (TCM) has detected a problem with the transmission fluid pressure sensor or its circuit. This sensor monitors the hydraulic pressure inside the transmission to ensure proper shifting and torque converter operation. When the signal is out of the expected range or performance is degraded, the TCM sets this code. Common causes include low transmission fluid, a faulty pressure sensor, wiring issues, or internal transmission problems.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifting
- Transmission slipping
- Transmission overheating
2. Most Common Causes
- Low or contaminated transmission fluid
- Faulty transmission fluid pressure sensor
- Wiring or connector issues in the sensor circuit
- Internal transmission mechanical failure
3. Step-by-Step Diagnosis
Step 1: Check transmission fluid level and condition; top off or replace if necessary.
Step 2: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Use a scan tool to monitor transmission fluid pressure sensor data and compare to specifications.
Step 4: Test the sensor resistance and voltage output; replace if out of range.
Step 5: If sensor and wiring are okay, perform a transmission pressure test to check for internal issues.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause further transmission damage. Limited driving to a repair shop is acceptable if the transmission is not slipping severely.
How much does it cost to fix?▼
Repair costs vary from $150 to $400 depending on the cause. A sensor replacement typically costs $150-$250, while internal transmission repairs can exceed $1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.