AutoCodes – GMC – P2077 GMC

P2077 GMC Code - Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage

Quick Answer

An Intake Manifold Tuning (IMT) Valve is used to change the intake manifold plenum configuration. Common causes include Faulty Intake Manifold Tuning Valve, Intake Manifold Tuning Valve harness is open or shorted, Intake Manifold Tuning Valve 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: P2077 GMC indicates Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Intake Manifold Tuning Valve, Intake Manifold Tuning Valve harness is open or shorted, Intake Manifold Tuning Valve 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 453

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 Nov 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2077 GMC Description

An Intake Manifold Tuning (IMT) Valve is used to change the intake manifold plenum configuration. When the IMT valve is open, the intake manifold is configured to one large plenum. When the IMT valve is closed, the intake manifold is configured to 2 smaller plenums. The IMT valve improves engine performance at low and high engine speeds depending on the engine load. The Diagnostic Trouble Code (DTC) will set when the control module detects that the state of the driver and the state of the circuit do not match. The control module will detect an open, short to ground on the variable tuning valve signal or an open or a short to ground on the ignition voltage circuit of the IMT valve solenoid for more than 6.25 seconds.

OBDII Code P2077 GMC - Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage - AutoCodes.com — P2077 GMC Code - Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2077 GMC?

Faulty Intake Manifold Tuning Valve
Intake Manifold Tuning Valve harness is open or shorted
Intake Manifold Tuning Valve circuit poor electrical connection

How to Fix the DTC P2077 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 P2077 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 P2077 GMC Code

1. What are the common symptoms of OBDII code P2077 related to the Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage?

Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

2. What are some possible causes of OBDII code P2077 in a GMC vehicle?

Potential causes of this code can include a faulty intake manifold tuning valve, damaged wiring or connectors, a defective sensor, or issues with the engine control module.

3. How can I diagnose the Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage issue triggering OBDII code P2077?

A thorough diagnostic process typically involves checking the wiring and connectors for damage, testing the intake manifold tuning valve and sensor, and ensuring proper voltage is reaching the sensor.

4. Can a dirty intake manifold cause the P2077 code to appear?

Yes, a dirty or clogged intake manifold can disrupt airflow and cause issues with the tuning valve position sensor, potentially triggering code P2077.

5. Is it safe to continue driving with OBDII code P2077 present in my GMC vehicle?

It is not recommended to drive with this code present, as it can lead to further engine damage and worsen fuel efficiency over time. It's best to address the issue promptly.

6. What are some possible DIY repair tips for fixing the Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage issue?

DIY repair tips may include checking and cleaning the intake manifold, inspecting wiring for damage, and replacing the sensor or tuning valve if necessary. However, professional diagnosis and repair are usually recommended.

7. How much does it typically cost to repair OBDII code P2077 related to the Intake Manifold Tuning Valve Position Sensor Circuit Low Voltage?

Repair costs can vary depending on the specific issue causing the code, but they may range from $200 to $500 or more for parts and labor at a repair shop.

8. Can resetting the OBDII system clear the P2077 code temporarily?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear after some driving cycles.

9. How can a mechanic determine if the Intake Manifold Tuning Valve Position Sensor needs replacement to resolve OBDII code P2077?

A mechanic can use specialized diagnostic tools to test the sensor's functionality, check for proper voltage readings, and inspect the overall condition of the sensor to determine if replacement is necessary.

10. Are there any recalls or technical service bulletins related to OBDII code P2077 in GMC vehicles?

It's recommended to check with a GMC dealership or online resources for any recalls or technical service bulletins specific to your vehicle model and year that may address the OBDII code P2077 issue.