Applicable Systems
OBD-II
Symptoms
Transmission 3-4 shift not completing within expected time; shift flare (engine RPM jump during shift) or harsh engagement.
Possible Causes
- 3-4 shift solenoid slow response
- Clutch pack worn for 3-4 shift
- Line pressure low during 3-4 shift
Troubleshooting Steps
- Step 1: Monitor 3-4 shift with scanner (RPM during shift)
RPM change smooth - Step 2: Check line pressure during 3-4 shift
Pressure adequate - Step 3: Inspect shift solenoid for 3-4 shift
Solenoid responds quickly - Step 4: If mechanical, transmission rebuild needed
Shift smooth after rebuild - Step 5: Clear code and verify 3-4 shift
No shift error
How to Reset
Clear with OBD-II scanner after repair.
Common Replacement Parts
- Shift Solenoid (OEM spec)
- Transmission Rebuild Kit (if internal)
Frequently Asked Questions
- Q: What is shift flare?
Engine RPM increases momentarily during shift (like slipping into neutral briefly). Indicates slow clutch apply or worn friction plates.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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