Description
The PAI 650671 is an aftermarket turbo speed sensor for Detroit Diesel Series 60 12.7L and 14.0L engines fitted with the GTA4502V variable-geometry turbocharger. It senses turbocharger shaft rotation and feeds the signal back to the ECM for overspeed protection and boost control. Direct replacement for Detroit Diesel 23531531 and A23531531.
Signs You Need a New Turbo Speed Sensor
- Check engine light with fault code 64 (Turbo Overspeed)
- Erratic boost pressure or fluctuating manifold readings
- Engine hesitation, power loss, or poor throttle response
- Turbo not spooling consistently across the rev range
- Intermittent loss of boost-control authority on the VGT
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 650671 |
| Part Type | Turbo Speed Sensor (VGT) |
| Engine Compatibility | Detroit Diesel Series 60 (12.7L, 14.0L) |
| Turbocharger | GTA4502V VGT |
| Connector | 2-Pin Oval |
| Thread | M10 x 1.0 |
| Overall Length | 37.75 in |
Cross References
This turbo speed sensor replaces or is equivalent to the following part numbers:
- Detroit Diesel: 23531531, A23531531
- Interstate McBee: A-23531531
Applications
This sensor fits the following engines:
- Detroit Diesel Series 60 12.7L (with GTA4502V VGT, 2003–2007)
- Detroit Diesel Series 60 14.0L (with GTA4502V VGT, 2003–2007)
Representative vehicles using these engines:
- Freightliner Century, Columbia, Classic, FLD, Coronado, Cascadia (Series 60)
- Kenworth T600, T800, W900 (Series 60)
- Peterbilt 378, 379, 387, 389 (Series 60)
- International 9200, 9400, 9900, ProStar (Series 60)
- Western Star 4900, 5900 (Series 60)
- Volvo VNL, VNM (Series 60)
This sensor is for VGT (variable-geometry) turbo applications only — it mounts to the GTA4502V turbocharger between the exhaust and compressor sections. Verify your turbocharger model and engine serial number before ordering.
