Skip to product information
SKU:
ZZ3F04718
Same day shipping if ordered by 4PM CST.
Speed Sensor Q21-6004 Fit for Peterbilt Kenworth Freightliner Volvo Tachometer
$56.19
In Stock
$56.19
Sale price
$56.19
Regular price
Part Number(s)
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
Speed Sensor Q21-6004 for Peterbilt Kenworth Freightliner Volvo
This speed sensor Q21-6004 provides accurate tachometer and speedometer signal output for select heavy-duty trucks for Peterbilt Kenworth Freightliner and Volvo. It delivers dependable vehicle speed data transmission to the ECM and gauge cluster for precise readouts.
Overview
This speed sensor Q21-6004 is an electronic component designed to measure rotational speed and send the signal to the tachometer or speedometer. It serves as a direct replacement for the original sensor on many Class 8 trucks. This Q21-6004 speed sensor is built to maintain accurate readings in demanding fleet operations.
Built For Performance
- Direct fit replacement for the OEM Q21-6004 sensor
- Precision-engineered sensing tip for reliable signal generation
- Robust housing resists vibration and thermal stress
- Sealed electrical connector protects against moisture and debris
- Compatible with standard SAE J1939 or pulse output harnesses
- Factory-tested for consistent output across temperature ranges
Fits These Machines
- for Peterbilt
- for Kenworth
- for Freightliner
- for Volvo
On-The-Job Use
- Long-haul highway operations requiring steady tachometer readings
- Regional delivery fleets using in-dash speedometers for accurate DOT logs
- Service bays replacing worn or failed sensors during scheduled maintenance
Specs At A Glance
| Part Number(s) | Q21-6004 |
| Sensor Type | Speed Sensor |
| Output Signal | Pulse type |
Good To Know
Q: Will this work on older Peterbilt models? A: Yes, it is designed for many Peterbilt trucks using the same Q21-6004 sensor location, but verify your vehicle's sensor mounting and connector shape.
Q: How do I know if my speed sensor is failing? A: Common symptoms include erratic speedometer needle, no speed reading, or the engine derating due to lost speed signal. Replacing this sensor restores normal operation.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.