4-5 Shift Malfunction
The P0784 code means the vehicle's onboard diagnostic system has detected: 4-5 Shift Malfunction. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $3000 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Harsh or no 4-5 upshift
- RPM stays high at highway speeds
- Reduced fuel economy
Probable Causes (Ranked by Likelihood)
- Faulty 4-5 shift solenoid Very High
- Worn 4-5 clutch pack High
- Valve body 4-5 shift circuit stuck Moderate
- TCM calibration issue Low
Frequently Asked Questions
Can I drive with code P0784?
Drive short distances only. Shift malfunction codes indicate the transmission is not shifting correctly, which can cause further damage.
What does P0784 mean?
4-5 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 P0784?
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.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Monitor 4-5 shift timing and quality
-
Check 4-5 shift solenoid electrically
-
Perform line pressure test
-
Check for TCM software updates
-
Internal inspection if solenoid is not the cause
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2007-2019 Toyota Camry
- 2006-2018 Honda Accord
- 2008-2019 Ford Fusion
- 2005-2017 Nissan Altima
Related Codes
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