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P0985

P0985: Transmission Advanced System - Transmission Control Module (TCM) Internal Error

Fix Cost

$500 - $2000

Parts & Labor

Difficulty

4/5

Hard

2-4 hours

DIY Possible?

❌ No

Pro recommended

📖 What Does P0985 Mean?

The Transmission Control Module (TCM) has detected an internal error, which may be caused by a faulty TCM, wiring issue, or other internal transmission component failure.

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Symptoms

• Transmission slips
• hesitation
• or refuses to engage gears
• unusual noises
• or transmission warning light illuminated on the dashboard.

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Common Causes

• Faulty TCM
• wiring issue
• internal transmission component failure
• faulty transmission solenoid
• or faulty transmission pressure sensor.

Fix Guide

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Possible Solutions

1. Check for any technical service bulletins (TSBs) related to the vehicle's transmission. 2. Use a scan tool to read any trouble codes and freeze frame data. 3. Inspect the wiring harness and connectors for any signs of damage or corrosion. 4. Check the transmission fluid level and condition. 5. Perform a transmission fluid exchange. 6. If the issue persists, replace the TCM or internal transmission component.

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❓ Common Questions About P0985

Can I drive with code P0985?

No, it is not recommended. Seeing code P0985 indicates a serious issue that could damage your engine or transmission if ignored. You should stop driving and have it inspected immediately.

How much does it cost to fix P0985?

The estimated repair cost for code P0985 is between $500 and $2000. This includes parts and labor for most makes and models.

Is this code easy to fix myself?

This repair is considered difficult. It may require specialized tools or significant disassembly. Professional help is recommended if you aren't an experienced DIYer.