The P2158: Vehicle Speed Sensor ‘B’ refers to a fault detected in the vehicle’s speed sensor ‘B’ circuit, which can result in inaccurate speed readings or sensor malfunctions. This can be caused by issues with the sensor itself, wiring problems, or sensor calibration errors.
P2158 – Quick Overview
Code | Information |
---|---|
Meaning | P2158: Vehicle Speed Sensor ‘B’ |
Is it serious? | Yes, this code can affect vehicle performance and safety. |
Possible causes | – Faulty vehicle speed sensor ‘B’ – Wiring or connector issues – Sensor calibration issues |
How to diagnose? | – Inspect wiring and connectors for the vehicle speed sensor ‘B’ – Test the sensor for faults – Check sensor calibration |
P2158 Meaning
The P2158: Vehicle Speed Sensor ‘B’ code signals a problem in the speed sensor system, which monitors and reports vehicle speed to the engine control module (ECM). When this sensor malfunctions or gives incorrect readings, it can lead to performance issues such as erratic shifting, inaccurate speedometer readings, and in some cases, cause safety systems like traction control to fail.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to see if there are other related codes. Multiple codes may indicate additional problems. | OBD-II Scanner |
Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the speed sensor ‘B’. Look for any signs of damage, wear, or corrosion. | Flashlight, Safety Gloves |
Test the Vehicle Speed Sensor ‘B’ | Use a multimeter to test the sensor for faults and ensure it is within the manufacturer’s specifications. | Multimeter, Diagnostic Tool |
Check Sensor Calibration | Verify if the speed sensor calibration is correct and matches the vehicle specifications. If necessary, recalibrate the sensor using the appropriate tools. | Calibration Tool (if needed) |
Repair or Replace Faulty Components | If you find faulty wiring, connectors, or the sensor itself, repair or replace as needed. | Replacement Parts, Tools |
Clear the Code and Test Drive | After repairs, clear the code with an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner |
Recheck for Codes | After the test drive, re-scan the vehicle to verify that the P2158 code has not returned. | OBD-II Scanner |

OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes

Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)