Transmission Range Display Circuit
P0814 indicates a malfunction in the transmission range display circuit, which communicates the current gear position to the instrument cluster. This code sets when the PCM detects an open, shorted, or out-of-range signal from the transmission range sensor or display circuit.
What You Might Notice
- Shift indicator on dashboard is completely inoperative or blank
- Shift indicator displays incorrect gear position
- Engine will not start or starts in wrong gear position
- Transmission range display flickering or intermittent
- No feedback on which gear is currently selected
Most Common Causes
- 1
Defective transmission range sensor
The sensor that reads gear position has failed electrically or mechanically. This prevents accurate signal transmission to the PCM and display.
- 2
Wiring issues in sensor circuit
Open, shorted, or corroded wiring in the transmission range sensor circuit prevents proper signal transmission. Check connectors and harness for damage.
- 3
Faulty shift indicator display
The instrument cluster display component itself is broken or failing, preventing visualization of gear selection even if sensor data is valid.
- 4
PCM programming error or failure
The powertrain control module has corrupted software or internal failure preventing proper processing of transmission range signals.
How to Diagnose It
- 1
Check Defective transmission range sensor — The sensor that reads gear position has failed electrically or mechanically. This prevents accurate signal transmission to the PCM and display.
- 2
Check Wiring issues in sensor circuit — Open, shorted, or corroded wiring in the transmission range sensor circuit prevents proper signal transmission. Check connectors and harness for damage.
- 3
Check Faulty shift indicator display — The instrument cluster display component itself is broken or failing, preventing visualization of gear selection even if sensor data is valid.
- 4
Check PCM programming error or failure — The powertrain control module has corrupted software or internal failure preventing proper processing of transmission range signals.
How to Fix It
- 1
Test and replace transmission range sensor
Use a DVOM to test the sensor output voltage in each gear position. Compare readings to manufacturer specifications. Replace the sensor if readings are out of range or absent.
- 2
Inspect and repair sensor wiring harness
Visually inspect all wiring, connectors, and pins in the transmission range sensor circuit for corrosion, damage, or looseness. Clean or resolder connections as needed.
- 3
Replace instrument cluster or shift indicator
If wiring and sensor test good but display remains inoperative, the instrument cluster display module may be faulty and require replacement or repair.
- 4
Update or reprogram PCM
Contact the dealership to check for available PCM software updates or perform a reprogramming procedure. If PCM is internally damaged, it may require replacement.
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