P08A4Gear Lever X Position Sensor 1/2 Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- An electronic selector lever with redundant sensing measures the X axis with two sensors. P08A4 means the two X readings no longer agree although each may be within its own limits. No manufacturer documents P08A4 publicly. GM, which runs dual PWM lever sensors, folds this comparison into the range/performance codes: P089B sets when X sensor 2 differs from sensor 1 by more than 12 % duty cycle. GM patents describe the principle: each sensor is checked against the gate and against its partner, and on disagreement the module trusts the more robust signal or commands neutral or park. CARB 1968.2 (e)(15) demands such plausibility monitoring. Y-axis counterpart is P08A5, the whole system P08A6.
- What you may notice
- Shifter warning message
- Range selection refused or vehicle held in neutral or park
- Check engine light, depending on the manufacturer
- Likely causes
- LikelyOne of the two X sensors drifting
- PossibleMagnet carrier or lever mechanism shifted or worn
- PossibleContact resistance on one sensor's signal path
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.