Code
P2795
Generic
P — Powertrain
Gear Shift Direction Circuit High
Views:
UK: 15
EN: 20
RU: 11
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the gear shift direction signal circuit
- Corroded or damaged connector or wiring (insulation breach, pin damage)
- Faulty gear shift direction sensor or switch (transmission range/position sensor)
- Poor or missing ground for the sensor or controller
- Intermittent open/short in harness due to chafing or water intrusion
- Faulty TCM/PCM internal input circuit
Symptoms
- Check Engine / MIL illuminated
- Transmission may enter limp or fail-safe mode (reduced gear availability)
- Erratic shifting, harsh or delayed shifts
- Transmission may remain in one gear or refuse to change direction
- Possible inability to select drive or reverse reliably
- Stored freeze-frame data and related transmission codes
What to check
- Read DTCs and freeze-frame data with a capable scanner; record related codes
- Verify battery voltage and system power before testing (12–14 V typical)
- Visually inspect connectors and wiring at the transmission sensor and TCM for damage, corrosion, or water intrusion
- Backprobe the gear shift direction signal connector and measure signal voltage with key ON, engine OFF and during shifter movement
- Perform a wiggle test on harness while observing live data for intermittent faults
- Check sensor ground circuit resistance to chassis and TCM ground
Signal parameters
- Reference supply (typical): 5 V reference from TCM/ECM (consult OEM spec)
- Normal signal range (typical): ~0.2 V up to ~4.8 V depending on sensor position
- Fault threshold: 'High' reported when signal is at or near battery voltage / exceeds upper OEM threshold (commonly >4.8 V)
- Sensor resistance: manufacturer-specific; check OEM spec for ohms-to-position values
- Scan-tool PID: gear shift direction / range position should change predictably when shifting
Diagnostic algorithm
- Retrieve and record all stored codes and freeze-frame data. Note related transmission codes.
- Confirm battery voltage is good and charge if necessary. Low voltage can corrupt readings.
- Visually inspect connectors, pins and wiring at the transmission shift-direction sensor and at the TCM. Repair any physical damage or corrosion.
- Backprobe the sensor signal wire with key ON (engine OFF). Measure signal voltage and compare to expected/typical values. If signal is present at near battery voltage, suspect a short to B+ or internal sensor fault.
- Disconnect the sensor connector and measure voltage at the harness side. If the harness still shows high voltage, the short is upstream (harness or TCM). If voltage disappears, the sensor is likely faulty or shorting.
- Check continuity between the signal wire and the TCM input; inspect for short to battery (measure continuity to B+). Repair any shorts or opens found.
- Inspect and test sensor ground circuit: measure resistance to chassis ground and TCM ground; ensure low resistance.
- If wiring and connectors check good, swap or bench-test the sensor if an identical known-good unit is available. Replace sensor only after wiring verification.
- If after replacing sensor the fault remains and harness is verified good, suspect TCM/PCM input fault and refer to manufacturer procedures for module testing or replacement.
- After repairs, clear codes and perform a road test to verify proper shifting and that the code does not return.
Likely causes
- Signal wire shorted to a fused 12 V source or B+
- Connector contamination/corrosion at sensor or TCM causing high reading
- Failed shift-direction sensor producing abnormally high output
- Damaged wiring insulation where it contacts chassis or power lead
- Defective TCM/PCM input stage (less common)
Fault status
Status
MIL on; TCM detected high voltage on gear shift direction circuit. Transmission may be in limp mode or exhibit shift abnormalities. Code stored with freeze-frame data.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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