AutoCodes – GMC – P0702 GMC

P0702 GMC Code - Transaxle Control System Low Voltage

Quick Answer

Each transaxle solenoid (TCC, pressure control, shift 2, shift 3, and shift 4) ground is controlled independently by the Powertrain Control Module (PCM). Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module 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: P0702 GMC indicates Transaxle Control System Low Voltage.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module 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 482

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 May 23, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0702 GMC Description

Each transaxle solenoid (TCC, pressure control, shift 2, shift 3, and shift 4) ground is controlled independently by the Powertrain Control Module (PCM). However, the PCM also controls ignition voltage simultaneously to all 5 solenoids whenever the fuel pump relay is commanded on. The Diagnostic Trouble Code (DTC) P0702 sets when the PCM detects low feedback voltage to all 5 solenoids when the engine is running, and the fuel pump relay is commanded on.

OBDII Code P0702 GMC - Transaxle Control System Low Voltage - AutoCodes.com — P0702 GMC Code - Transaxle Control System Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0702 GMC?

Faulty Powertrain Control Module (PCM)
Powertrain Control Module harness is open or shorted
Powertrain Control Module circuit poor electrical connection

How to Fix the DTC P0702 GMC?

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 P0702 GMC 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 P0702 GMC Code

1. What are the common symptoms of OBDII code P0702 in a GMC vehicle?

- Common symptoms include erratic shifting, harsh shifting, transmission slipping, and the transmission going into limp mode.

2. What does the OBDII code P0702 GMC indicate?

- The code P0702 indicates a low voltage condition in the transaxle control system of the vehicle.

3. What are the possible causes of OBDII code P0702 in a GMC vehicle?

- Possible causes include a faulty transaxle control module, damaged wiring or connectors, low battery voltage, or a defective transmission range sensor.

4. How can I diagnose the OBDII code P0702 in my GMC vehicle?

- Diagnosing the code may involve checking the wiring and connectors for damage, testing the battery voltage, and using a diagnostic scanner to retrieve specific error codes.

5. Can I continue driving my GMC vehicle with the OBDII code P0702 present?

- It is not recommended to continue driving with the code present, as it can lead to further damage to the transmission and potential safety hazards.

6. How can I repair OBDII code P0702 in my GMC vehicle?

- Repair options may include replacing the transaxle control module, repairing damaged wiring or connectors, addressing low battery voltage, or replacing the transmission range sensor.

7. Will resetting the OBDII code P0702 clear the issue in my GMC vehicle?

- Resetting the code may temporarily clear the issue, but it is important to address the underlying cause to prevent the code from reoccurring.

8. Is it safe to ignore the OBDII code P0702 in my GMC vehicle?

- Ignoring the code can lead to transmission problems and potential safety risks, so it is recommended to address the issue promptly.

9. How much does it typically cost to repair OBDII code P0702 in a GMC vehicle?

- The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred dollars to over a thousand dollars for parts and labor.

10. Can I fix the OBDII code P0702 in my GMC vehicle myself, or do I need to take it to a professional mechanic?

- While some DIY enthusiasts may be able to address simple causes like damaged wiring, it is recommended to consult a professional mechanic for accurate diagnosis and repair of the transaxle control system issue.