P0886
PowertrainTransmissionhigh severityTCM Power Relay Control Circuit Low
What P0886 Means
The TCM power relay control circuit voltage is too low. This suggests a short to ground or wiring fault in the relay control line.
Symptoms
- Transmission stays in limp mode
- Warning light illuminated
- Delayed or no engagement
Common Causes
- Short to ground in control wiring
- Faulty TCM power relay
- Corroded connectors
- Faulty transmission control module
Diagnostic Steps
- Check control circuit for short to ground
- Test the power relay
- Inspect wiring and connectors
- Repair shorted wiring or replace relay
🔌 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 →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
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
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0886?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix