P0652
PowertrainPcm Referencemoderate severitySensor Reference Voltage B Circuit Low
What P0652 Means
The PCM detected a low voltage condition on the B sensor reference voltage circuit. Sensors sharing this reference may read incorrectly.
Symptoms
- Multiple sensor faults
- Poor engine performance
- MIL illuminated
Common Causes
- Short to ground in reference circuit
- Shorted sensor pulling voltage low
- Damaged wiring
- PCM internal fault
Diagnostic Steps
- Retrieve trouble codes
- Inspect wiring for short to ground
- Disconnect sensors to isolate short
- Test PCM reference output
🔌 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 P0652?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix