What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » P185A

Code P185A

Symptoms

• Transmission slipping

• Harsh gear shifts

• Check Engine Light is on

Common Causes

• Faulty pressure control solenoid

• Wiring issues or poor connections

• Transmission fluid problems

Glossary

Solenoid: An electromechanical device that controls fluid flow in the transmission.

TCM: Transmission Control Module, which manages the operation of the transmission.

Related Codes

• P0755

• P0776

Laymans terms

This code means that the car's computer is confused about the position of a part that helps control the gears. It's like when you think you're in drive or reverse, but the car isn't sure.

Explanation

The code indicates an issue with the pressure control solenoid, which is not matching the expected gear position (Drive or Reverse).

Technical description

P185A is triggered when the transmission control module (TCM) detects an implausible signal from the pressure control solenoid. This solenoid is responsible for regulating hydraulic pressure to engage the correct gear. The mismatch between the actual and desired gear position causes this error.

Diagnosis steps

• Check for other related codes

• Inspect the wiring and connections to the solenoid

• Test the solenoid for proper operation

Repair procedures

• Replace the faulty solenoid

• Repair or replace damaged wiring

• Flush and replace transmission fluid

Tools required

• OBD-II scanner

• Multimeter

• Socket set

Estimated repair cost

$200 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular transmission fluid checks

• Routine transmission maintenance

• Avoiding harsh driving conditions

Error code type

Transmission Issue

User experience recommendations

• Avoid driving the vehicle if it shifts harshly

• Consult a professional mechanic for diagnosis

Warranty information

Check with the vehicle manufacturer for specific warranty coverage on transmission components.

Historical data

This code has been associated with vehicles that have a history of transmission issues, particularly in models with high mileage.

Urgency level

Moderate – It is important to address this issue to prevent further transmission damage.

Legal and safety notice

Driving with transmission issues can be unsafe and may lead to further damage. It is recommended to have the vehicle inspected by a professional.

Testing conditions

• Vehicle in Drive or Reverse

• Engine running

Component location

The pressure control solenoid is located within the transmission assembly.

FAQs

Q: Can I drive with a P185A code?
A: It's not recommended to drive with this code as it can lead to further transmission damage.

Q: How do I reset the P185A code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, further diagnosis is needed.

Last updated: Jun 9, 2026 • Source: internal database

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