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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What Are the Symptoms of P0784?
- Check Engine Light illuminated
- Harsh or no 4-5 upshift
- RPM stays high at highway speeds
- Reduced fuel economy
What Causes P0784? (Most Likely First)
- 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
Can I Still Drive with P0784?
Short distances only. P0784 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
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
How Do You Diagnose P0784?
-
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
Which Vehicles Commonly Get P0784?
- 2007-2019 Toyota Camry
- 2006-2018 Honda Accord
- 2008-2019 Ford Fusion
- 2005-2017 Nissan Altima
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