P27B4
Internal Control Module Transmission Gear Direction Control Performance
P27B4 is an OBD-II diagnostic trouble code meaning: Internal Control Module Transmission Gear Direction Control Performance. Common causes: transmission control module (tcm) malfunction, problems with shift solenoids. Estimated repair cost: $56–278.
Symptoms
- Incorrect gear shifting
- Car won't shift into certain gears
- Delays when shifting gears
- Transmission transition to emergency mode
- Check Engine light comes on
Causes
- Transmission control module (TCM) malfunction
- Problems with shift solenoids
- Open or short circuit in wiring harness
- Low or contaminated transmission fluid
- Mechanical damage inside the transmission
How to Fix
- Check the level and condition of the transmission fluid
- Diagnose the transmission control module
- Check the condition of the gearshift solenoids
- Inspect the wiring harness for damage
- If necessary, replace the transmission control module
Related codes
Error P27B4 by Vehicle Brand
FAQ
What does the P27B4 code mean?
P27B4 is an OBD-II diagnostic trouble code that indicates: Internal Control Module Transmission Gear Direction Control Performance
What causes a P27B4 error code?
The most common causes of P27B4 include: Transmission control module (TCM) malfunction; Problems with shift solenoids; Open or short circuit in wiring harness; Low or contaminated transmission fluid.
How do I fix a P27B4 diagnostic trouble code?
To fix P27B4: Check the level and condition of the transmission fluid. Diagnose the transmission control module. Check the condition of the gearshift solenoids. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P27B4?
Do not drive — repair immediately
How much does it cost to fix P27B4?
The estimated repair cost for P27B4 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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