AutoCodes – Cadillac – P2158 Cadillac

P2158 Cadillac Code - Vehicle Speed Sensor 2

Quick Answer

The Vehicle Speed Sensor (VSS) provides vehicle speed information to the Engine Control Module (ECM). Common causes include Faulty Vehicle Speed Sensor (VSS), Vehicle Speed Sensor (VSS) harness is open or shorted, Vehicle Speed Sensor (VSS) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2158 Cadillac indicates Vehicle Speed Sensor 2.
Common causes: Common causes include Faulty Vehicle Speed Sensor (VSS), Vehicle Speed Sensor (VSS) harness is open or shorted, Vehicle Speed Sensor (VSS) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 996

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2158 Cadillac Description

The Vehicle Speed Sensor (VSS) provides vehicle speed information to the Engine Control Module (ECM). The VSS is a permanent magnet generator. The sensor is mounted in the transfer case facing the rear internal gear which is splined to the output shaft assembly. As the output shaft and internal gear rotate, the toothed rotor of the internal gear produces AC voltage as the rotor teeth pass through the magnetic field of the sensor. The AC voltage level and the number of pulses increase as the speed of the vehicle increases. The ECM converts the voltage to vehicle speed. The ECM uses the output shaft speed signal to determine shift timing, as well as transfer case range.

OBDII Code P2158 Cadillac - Vehicle Speed Sensor 2 - AutoCodes.com — P2158 Cadillac Code - Vehicle Speed Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2158 Cadillac?

Faulty Vehicle Speed Sensor (VSS)
Vehicle Speed Sensor (VSS) harness is open or shorted
Vehicle Speed Sensor (VSS) circuit poor electrical connection

How to Fix the DTC P2158 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2158 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2158 Cadillac Code

What does the OBDII code P2158 mean for a Cadillac?

The P2158 code indicates an issue with Vehicle Speed Sensor 2, which monitors wheel or drivetrain speed for proper vehicle operation.

What are the common symptoms of P2158 on a Cadillac?

Symptoms include erratic speedometer readings, loss of cruise control, reduced engine performance, or transmission shifting problems.

What causes the P2158 code on a Cadillac?

Common causes include a faulty Vehicle Speed Sensor 2, damaged wiring or connectors, corrosion, or issues with the PCM (Powertrain Control Module).

Can I drive my Cadillac with a P2158 code?

It is not advised to drive with this code, as it can lead to unsafe driving conditions, such as incorrect speed readings or transmission malfunctions.

How do I diagnose the P2158 code on a Cadillac?

Diagnose by checking the wiring and connectors for damage, testing the Vehicle Speed Sensor 2 for proper function, and using a diagnostic scanner to verify sensor readings.

How can I fix the P2158 code on a Cadillac?

Repairs may include replacing the faulty Vehicle Speed Sensor 2, repairing damaged wiring, cleaning corroded connectors, or updating the PCM software.

What tools are needed to fix the P2158 code?

A diagnostic scanner, multimeter, and basic hand tools are typically required to diagnose and repair this issue.

How much does it cost to fix the P2158 code on a Cadillac?

Repair costs vary but can range from $150 to $400, depending on whether the issue is sensor replacement or wiring repair.

Will clearing the code fix the P2158 issue on my Cadillac?

Clearing the code without addressing the underlying issue will not fix the problem; the code will likely return.

Can a faulty Vehicle Speed Sensor affect fuel efficiency?

Yes, a malfunctioning speed sensor can disrupt engine performance and transmission operation, potentially decreasing fuel efficiency.

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