P27EE

Code

Generic P — Powertrain

Transmission Range Control A Position Sensor/Switch Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 31 EN: 47 RU: 29

AI status

Completed

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Page language: EN

Causes

Damaged or corroded wiring or connector at the transmission range sensor/switch
Open or short to voltage in the sensor signal circuit
Faulty transmission range position sensor/switch (PRNDL sensor)
Poor sensor ground or reference voltage (low/poor ground connection)
Faulty PCM or internal driver (less common)
Aftermarket shifter, recent repair or modification affecting wiring

Symptoms

MIL/Check Engine lamp on
Incorrect gear indication on dash (wrong PRNDL display)
Transmission may start in wrong gear, not shift correctly, or go to limp/limited mode
Stored DTC(s) related to range sensor or transmission control
Intermittent loss of gear selection recognition

What to check

Retrieve all stored codes and freeze frame data with a scan tool
Visually inspect shift lever assembly, wiring harness, and transmission connector for damage, corrosion, or loose pins
Check for aftermarket shifter or recent repairs that could affect wiring
Verify battery voltage is stable during tests (key on)
Backprobe sensor connector and confirm presence of reference voltage and ground

Signal parameters

Typical reference voltage: about 5.0 V (varies by vehicle) — verify with factory data
Expected signal voltage: varies by gear and manufacturer (commonly 0–5 V range); a "HIGH" fault indicates signal is above expected threshold or near reference voltage/full scale
Open circuit often reads near reference voltage or battery voltage through internal pull‑up
Ground integrity expected near 0 V at chassis/PCM ground

Diagnostic algorithm

Connect a capable scan tool and note freeze frame and which gear/condition set the code
Perform a visual inspection of wiring and connector at the transmission range sensor/switch; repair obvious damage
With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (≈5 V), sensor signal, and ground using a digital multimeter
If signal is high, disconnect the sensor and measure voltage at the harness connector to see if the signal line remains high — a high reading with the sensor disconnected suggests wiring/PCM pull‑up or short to voltage
Wiggle test wiring while monitoring the signal to reproduce intermittent faults
If available, use a scope to observe signal waveform while moving shifter through positions — confirm expected changes and absence of noise
Check continuity and resistance of signal and ground circuits between sensor connector and PCM; repair any opens or shorts
If wiring and connector check good, replace the transmission range sensor/switch and retest
If fault remains after sensor replacement and wiring verified, consider PCM input driver failure — consult manufacturer guidance before replacing PCM
Clear codes and road test to confirm repair; monitor for reoccurrence

Likely causes

Corroded/loose connector or pin at the range sensor
Broken or chafed signal wire causing an open or stray voltage pull‑up
Faulty transmission range sensor/switch
Poor ground or reference circuit connection

Fault status

⚠️ Status

Transmission Range Control A Position Sensor/Switch Circuit High (P27EE). Signal voltage on the range sensor circuit is higher than expected. Inspect wiring/connectors, verify reference and ground, test sensor functionality, repair wiring or replace sensor as required. If wiring and sensor are good, consult PCM diagnostics.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours