P2704 serious

Transmission Friction Element B Stuck On

The P2704 code means the vehicle's onboard diagnostic system has detected: Transmission Friction Element B Stuck On. This is a serious severity code.

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Keep driving?: No -- stop driving
DIY difficulty: Advanced
Estimated cost: $800 - $3,500 (solenoid replacement to transmission rebuild)

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

Check Engine Light and transmission warning light on
Transmission stuck in gear due to clutch B not releasing
Harsh or delayed shifting
Transmission overheating
Vehicle may enter limp mode

Probable Causes (Ranked by Likelihood)

Internal clutch B piston seal failure High
Clutch B friction plates welded/fused from overheating High
Pressure control solenoid for clutch B stuck open Medium
Transmission fluid contamination or breakdown Medium
Valve body hydraulic circuit blockage Low

Step-by-Step Diagnostic Procedure

Scan for codes and confirm P2704 with freeze frame data
Check transmission fluid level, color, and smell for burnt odor
Monitor clutch B apply pressure with scan tool during shifts
Perform solenoid function test for clutch B circuit
Inspect valve body for stuck valves or debris

Frequently Asked Questions

What does P2704 mean?

P2704 indicates that the transmission control module has detected a problem with friction element (clutch) B: stuck on. This clutch pack is used in specific gear combinations within the transmission.

Can I drive with P2704?

Do not drive - the transmission is at risk of further damage.

How much does it cost to fix P2704?

Costs range from $800 - $3,500. A fluid change and solenoid replacement may resolve simpler cases. Internal clutch pack failure requires transmission removal and rebuild.