P0843
PowertrainTransmission Pressuremoderate severityTransmission Fluid Pressure Sensor/Switch A Circuit High
What P0843 Means
The PCM detected a voltage higher than expected in the transmission pressure sensor A circuit. This may point to an open circuit or short to voltage.
Symptoms
- Harsh shifts
- Transmission warning light
- Delayed engagement
Common Causes
- Open circuit in wiring
- Short to power
- Faulty pressure sensor
- Poor connector contact
Diagnostic Steps
- Retrieve codes and freeze frame
- Inspect wiring for open or short to power
- Check sensor ground and connector
- Test sensor signal voltage against spec
🔌 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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