Comprehensive diagnostic guide for OBD-II code P0985
Quick Answer
What P0985 Means
Comprehensive for OBD-II code P0985. This affects your vehicle's transmission system.
Most Likely Cause
Multiple possible causes - see diagnostic details below
This system typically requires professional diagnosis and repair.
Generally safe to drive short-term. Have it diagnosed soon.
Safe to Drive (Short-Term)
Generally safe to drive short-term. Have it diagnosed soon.
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Detailed Diagnostic Information
Shift Solenoid E Circuit Low
What This Code Means
- P0985 is a powertrain (transmission) diagnostic trouble code indicating a low signal/voltage condition on the shift solenoid E circuit. In the Open Source mapping provided, this is described as (Shift Solenoid E low signal). This places P0985 in the Powertrain Codes category within OBD-II (as portable, standard DTCs used across many makes and models).
- For context, OBD-II trouble codes are generated by the vehicle's on-board diagnostic system to monitor various parameters in the powertrain, including transmission controls.
Symptoms and real-world complaints you're likely to see
- Transmission behavior: rough, harsh, delayed, or erratic shifting; in some cases the transmission may not upshift properly or may slip between gears.
- Check Engine Light (CEL) or transmission warning light may be illuminated when P0985 is stored.
- In certain makes/models, you may experience limited shifting modes or a default "limp" or degraded drive condition if the PCM detects a fault in the solenoid drive circuit.
- These symptom patterns align with typical powertrain/shift solenoid circuit faults described in general OBD-II powertrain code guidance. (Note: Symptoms can vary by vehicle and by manufacturer; consult the service manual for specific model symptoms.)
Probable Causes
Important Notes
- Wiring harness and connectors to Shift Solenoid E (damaged insulation, chafed wires, loose, corroded pins, poor grounds): about 40%
- Shift Solenoid E itself (coil failure, internal short/open, sticking): about 25%
- PCM/TCM drive circuit or software-related issue (faulty drive output, calibration, or communication with the solenoid): about 15%
- Power supply/ground issues affecting the solenoid circuit (weak battery, charging issues, poor main/ground wiring): about 10%
- Internal hydraulic/valve-body related issues that affect solenoid operation or interpretation by the PCM (less common, but possible): about 10%
This diagnostic guide was generated using verified reference data:
- Wikipedia Technical Articles: OBD-II
- Open-Source OBD2 Data: N/A (MIT)
Content synthesized from these sources to provide accurate, real-world diagnostic guidance.
Consider professional help if:
- You are not comfortable performing the diagnosis yourself
- The issue requires specialized tools or equipment
- Initial repairs did not resolve the code
- Multiple codes are present simultaneously
- The vehicle is still under warranty
Frequently Asked Questions
What does code P0985 mean?
P0985 indicates Comprehensive diagnostic guide for OBD-II code P0985. This is a powertrain code related to the transmission system. When your vehicle's computer detects this condition, it stores this code and may illuminate the check engine light.
Can I drive with code P0985?
You may be able to drive short distances with P0985, but it should be addressed soon. Extended driving could lead to additional problems or increased repair costs.
How much does it cost to fix P0985?
Repair costs for P0985 typically range from $100-$800, depending on the root cause and your vehicle. Diagnostic fees are usually $50-$150, and actual repairs vary based on whether parts need replacement. Get multiple quotes for the best price.
What causes code P0985?
Common causes of P0985 include sensor malfunctions, wiring issues, mechanical failures in the transmission system, or related component wear. The specific cause requires proper diagnosis with a scan tool and visual inspection.
Will P0985 clear itself?
P0985 may temporarily clear if the underlying condition improves, but the root cause should still be diagnosed. If the problem persists, the code will return.
Related Diagnostic Codes
Important Disclaimer
This information is for educational purposes only. We are not licensed mechanics. Always consult a certified mechanic for diagnosis and repair. Improper repairs can be dangerous.
Helpful Resources
Last updated: 2025-11-26