P085A — Gear Shift Control Module B Communication Circuit

What Does P085A Mean?

P085A is a diagnostic trouble code indicating: Gear Shift Control Module B Communication Circuit. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P085A

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Gear Shift Control Module B Communication readings
⚠️ Related system operating intermittently
⚠️ Harsh or delayed shifting

Common Causes

🔍 Wiring issue in Gear Shift Control Module B Communication circuit (damaged, chafed, or corroded)
🔍 Faulty Gear Shift Control Module B Communication connector or terminal
🔍 Failed Gear Shift Control Module B Communication
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P085A mean?

P085A indicates: Gear Shift Control Module B Communication Circuit. The vehicle's computer has detected that the Gear Shift Control Module B Communication is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P085A?

Only short distances if absolutely necessary. P085A affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P085A?

Repair costs for P085A typically range from $150 to $500, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Gear Shift Control Module B Communication wiring and connectors
🔧 Replace faulty Gear Shift Control Module B Communication

1
Find your vehicle above
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P085A: Gear Shift Control Module B Communication Circuit