P0780 critical

Shift Malfunction

The P0780 code means the vehicle's onboard diagnostic system has detected: Shift Malfunction. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $500 - $4500 (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

Check Engine Light illuminated
Transmission will not shift properly
Stuck in one gear
Severe slipping
Limp mode activated

Probable Causes (Ranked by Likelihood)

Multiple shift solenoid failures Very High
Severe internal transmission damage High
Complete valve body failure Moderate
TCM malfunction Low

Step-by-Step Diagnostic Procedure

Check for multiple shift solenoid codes
Check transmission fluid -- burnt fluid with metal particles indicates internal failure
Perform a complete solenoid resistance check on all shift solenoids
Check TCM for power, ground, and communication
Transmission rebuild or replacement is likely needed

Frequently Asked Questions

Can I drive with code P0780?

Do not drive. Shift malfunction codes indicate the transmission is not shifting correctly, which can cause further damage.

What does P0780 mean?

Shift Malfunction. This means the TCM has detected that a shift event is not occurring as expected. The cause can range from a faulty solenoid to internal transmission wear.

Will a transmission flush fix P0780?

A fluid flush alone rarely fixes shift malfunction codes. However, if the fluid is contaminated, a flush combined with solenoid replacement may resolve the issue. Never flush a transmission with heavily burnt fluid, as it can dislodge debris and cause further damage.