P0987
UniversalIndicates an electrical circuit malfunction in the Transmission Fluid Pressure Sensor/Switch 'E' circuit, reporting a voltage reading that is outside the normal operating range.
Medium SeverityThis code signifies an electrical problem within the Transmission Fluid Pressure Sensor/Switch E circuit, which is vital for the transmission control module to accurately monitor fluid pressure. This malfunction can lead to incorrect gear selection, delayed engagement, or the transmission entering a protective 'limp home' mode.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely supported on jack stands if working underneath. Allow components to cool before touching to avoid burns. Disconnect the battery before performing any electrical work or removing components to prevent accidental short circuits or system damage.
Common Symptoms
- Check Engine Light illuminated
- Transmission shifting erratically or harshly
- Delayed engagement of gears
- Vehicle stuck in 'limp home' mode (usually third gear)
- Poor fuel economy
- Transmission may not shift into certain gears
Common Causes
- Faulty Transmission Fluid Pressure Sensor/Switch E
- Damaged, corroded, or shorted wiring or connectors in the sensor circuit
- Internal transmission mechanical failure causing incorrect pressure
- Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Connect an OBD-II scanner to confirm the P0987 code and check for any related codes.
- Visually inspect the wiring harness and connectors leading to the transmission fluid pressure sensor for any signs of damage, corrosion, or loose connections. Repair as necessary.
- Using a multimeter, test the continuity and resistance of the sensor's circuit wiring according to the vehicle's service manual specifications.
- If accessible, test the transmission fluid pressure sensor itself for correct voltage output and resistance at different pressure ranges, if specifications are available.
- If the sensor tests faulty or the wiring is confirmed to be good, replace the Transmission Fluid Pressure Sensor/Switch E.
- Clear the DTCs from the PCM and perform a test drive to ensure the code does not return and transmission operates normally.
👨🔧 When to Call a Professional
If diagnosing the exact fault within the Transmission Fluid Pressure Sensor/Switch E circuit proves complex, or if the symptoms persist after replacing the sensor, it is best to consult a professional mechanic specializing in transmissions to prevent further damage.
Commonly Asked Questions
What does 'Sensor/Switch E' refer to?
The 'E' typically refers to a specific sensor or circuit within a multi-sensor system, as manufacturers use alphabetical designations to differentiate multiple components of the same type within a system. Your vehicle's service manual will specify its exact location.
Can I drive my car with a P0987 code?
While you might be able to drive, it is not recommended for long periods. Erratic shifting or limp mode can be unpredictable and potentially unsafe, increasing the risk of further transmission damage. It's best to address the issue promptly.
Is a P0987 code always a bad sensor?
Not necessarily. While a faulty sensor is common, the code indicates a 'circuit' issue, meaning the problem could also be with the wiring, connectors, or even the vehicle's computer (TCM/PCM) not receiving or interpreting the signal correctly.
How much does it cost to fix a P0987 code?
The cost varies greatly depending on the cause. A sensor replacement might range from $150-$400, while wiring repairs could be less. If the issue points to the TCM/PCM or internal transmission problems, costs can be significantly higher.
Do I need special tools to diagnose this code?
A basic OBD-II scanner is essential. A multimeter is also highly recommended for testing wiring continuity and sensor resistance. For more in-depth diagnosis, a scan tool capable of reading live transmission data may be needed.