OBD-II code · Powertrain (generic)
P078E Shift Timing Solenoid B Intermittent
Shift timing solenoid B signal jumps or drops out.
Is it safe to drive with P078E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLoose connector at the transmission
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Timing Solenoid B, Tcm
Related codes
- P0789Shift Timing Solenoid A Intermittent
- P078AShift Timing Solenoid B
- P078BShift Timing Solenoid B Range/Performance
- P078CShift Timing Solenoid B Low
- P078DShift Timing Solenoid B High
- P078FTransmission Mode Switch C Circuit
- P0790Normal/Performance Switch Circuit
- P0791Intermediate Shaft Speed Sensor A Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.