AutoCodes – Chevrolet – P1758 Chevrolet

P1758 Chevrolet Code - Transmission Range Switch Indicates Drive Without Drive Ratio

Quick Answer

The Transmission Range (TR) switch is part of the park/neutral position and back-up lamp switch assembly and is mounted on the transmission manual shaft. Common causes include Faulty Transmission Range (TR) Switch, Transmission Range Switch harness is open or shorted, Transmission Range Switch 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: P1758 Chevrolet indicates Transmission Range Switch Indicates Drive Without Drive Ratio.
Common causes: Common causes include Faulty Transmission Range (TR) Switch, Transmission Range Switch harness is open or shorted, Transmission Range Switch 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 557

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 Feb 03, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1758 Chevrolet Description

The Transmission Range (TR) switch is part of the park/neutral position and back-up lamp switch assembly and is mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The fuse block supplies ignition voltage to the TR switch on four signal circuits, A, B, C, and P. Each gear selector lever position powers two or more of the signal circuits in a unique pattern. In order to determine the gear range selected by the driver, the TCM compares the voltage combination on the signal circuits to a TR switch combination table stored in memory. Refer to Transmission Range Switch Logic. When the TCM detects the combination of TR switch signals for a forward range and the vehicle is not moving, Diagnostic Trouble Code (DTC) P1758 sets. DTC P1758 is a type B DTC.

OBDII Code P1758 Chevrolet - Transmission Range Switch Indicates Drive Without Drive Ratio - AutoCodes.com — P1758 Chevrolet Code - Transmission Range Switch Indicates Drive Without Drive Ratio

What does this mean?

What are the Possible Causes of the DTC P1758 Chevrolet?

Faulty Transmission Range (TR) Switch
Transmission Range Switch harness is open or shorted
Transmission Range Switch circuit poor electrical connection

How to Fix the DTC P1758 Chevrolet?

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 P1758 Chevrolet 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 P1758 Chevrolet Code

1. What does the OBDII code P1758 mean for a Chevrolet?

P1758 indicates that the transmission range switch is signaling the "Drive" position, but the transmission is not achieving the correct drive gear ratio.

2. What are common symptoms of code P1758 in a Chevrolet?

Symptoms may include erratic shifting, the transmission stuck in a single gear, reduced power, or activation of the Check Engine Light.

3. What causes the P1758 code to appear?

Common causes include a faulty transmission range switch, damaged wiring or connectors, a failing transmission solenoid, or internal transmission issues.

4. Can driving with code P1758 damage my Chevrolet?

Yes, driving with this code can cause further damage to the transmission and reduce vehicle performance.

5. How is code P1758 diagnosed in a Chevrolet?

Diagnosis typically involves scanning for codes, inspecting the transmission range switch, checking wiring connections, and performing a test on the transmission.

6. What repairs can fix code P1758 in a Chevrolet?

Repairs may include replacing the transmission range switch, repairing damaged wiring, replacing solenoids, or addressing internal transmission issues.

7. How much does it cost to fix code P1758 on a Chevrolet?

Repair costs vary depending on the underlying issue but can range from $150 for a range switch replacement to several thousand dollars for internal transmission repairs.

8. Can a faulty transmission range switch cause code P1758?

Yes, a malfunctioning transmission range switch is a common cause of this code.

9. Do I need to reset the code after repairs are made for P1758?

Yes, after repairs, the code should be cleared using an OBDII scanner to verify the issue is resolved.

10. Is P1758 a common issue in Chevrolet vehicles?

While not one of the most common transmission codes, it can occur in Chevrolet vehicles due to wear or electrical issues affecting the transmission range switch or related components.