AutoCodes – Pontiac – P258F Pontiac

P258F Pontiac Code - Torque Management Request Output Signal

Quick Answer

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) software update. 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: P258F Pontiac indicates Torque Management Request Output Signal.
Common causes: Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) software update.
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 1,062

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 Jan 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P258F Pontiac Description

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM.
A fault in the CAN will not cause the ECM to set the Diagnostic Trouble Codes (DTC). If a CAN fault occurs, other DTCs will set before this code.
The ECM set the OBDII code when the TCM receives a torque reduction failure message from the ECM.

OBDII Code P258F Pontiac - Torque Management Request Output Signal - AutoCodes.com — P258F Pontiac Code - Torque Management Request Output Signal

What does this mean?

What are the Possible Causes of the DTC P258F Pontiac?

Faulty Engine Control Module (ECM)
Faulty Transmission Control Module (TCM)
Engine Control Module (ECM) software update
Transmission Control Module (TCM) software update
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P258F Pontiac?

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 P258F Pontiac 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 P258F Pontiac Code

1. What does the OBDII code P258F mean on a Pontiac?

The P258F code indicates a fault related to the Torque Management Request Output Signal, which is used to coordinate engine and transmission performance.

2. What are the common symptoms of code P258F in a Pontiac?

Symptoms may include reduced engine performance, poor acceleration, transmission shifting issues, and a lit check engine light.

3. What causes the P258F code to appear on a Pontiac?

Common causes include a malfunctioning torque management module, wiring or connection issues, software glitches, or a problem in the powertrain control module (PCM).

4. Can a faulty sensor trigger the P258F code in a Pontiac?

Yes, a faulty sensor related to the torque management system, such as a throttle position sensor or transmission sensor, can trigger this code.

5. How do I diagnose the P258F code on my Pontiac?

Start by inspecting the wiring and connectors for damage or corrosion. Then, use a scan tool to monitor torque management signals and check for other related codes.

6. Can I drive my Pontiac with the P258F code active?

Itâ€™s not recommended to drive for extended periods, as this code can cause reduced performance and potential transmission or engine damage if ignored.

7. What repairs can fix the P258F code in a Pontiac?

Repairs may include replacing damaged wiring, updating the vehicle's software, repairing or replacing the torque management module, or addressing faulty sensors.

8. Does the P258F code require reprogramming the PCM?

In some cases, reprogramming the PCM or updating its software may be necessary to resolve the issue.

9. How much does it cost to fix the P258F code on a Pontiac?

Repair costs can vary depending on the specific cause but may range from $100 for wiring repairs to over $500 for module replacements or reprogramming.

10. Will clearing the P258F code solve the problem permanently?

Clearing the code will erase it temporarily, but if the underlying issue isnâ€™t fixed, the code will return. Permanent resolution requires addressing the root cause.