P2885 moderate

Transmission Internal Mode Switch B Circuit

The P2885 code means the vehicle's onboard diagnostic system has detected: Transmission Internal Mode Switch B Circuit. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $300 - $1,200 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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Common Symptoms

Abnormal internal mode switch B operation
Transmission shifting irregularly
Check Engine Light on
Possible transmission overheating

Probable Causes (Ranked by Likelihood)

Faulty internal mode switch B Very High
Wiring damage in internal mode switch B circuit High
Contaminated or low transmission fluid Moderate
TCM internal malfunction Low

Step-by-Step Diagnostic Procedure

Scan for DTCs and review freeze frame data
Test internal mode switch B operation
Inspect wiring and connectors for damage
Monitor internal mode switch B parameters with scan tool

Frequently Asked Questions

What is the internal mode switch B?

The internal mode switch B is a component within the transmission system that helps manage shift quality and overall transmission operation.

Can I drive with this code?

Short distance driving may be possible at reduced speeds, but have it diagnosed soon to prevent further damage.

Is this expensive to fix?

Repair costs depend on whether the issue is wiring, a sensor, or internal component failure. Wiring repairs are typically under $500, while internal repairs can exceed $1,000.