P0966
PowertrainTransmission Solenoidhigh severityPressure Control Solenoid "B" Control Circuit Low
What P0966 Means
The control circuit for pressure control solenoid B reads lower voltage than expected. This typically indicates a short to ground or internal solenoid failure.
Symptoms
- Harsh shifting
- Transmission slipping
- Check engine light on
Common Causes
- Short to ground in wiring
- Faulty pressure control solenoid B
- Damaged connector
- Faulty TCM/PCM
Diagnostic Steps
- Scan and record freeze frame data
- Inspect wiring for shorts to ground
- Measure solenoid resistance
- Repair wiring or replace solenoid
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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