P2721 GMC Code - Pressure Control Solenoid 4 Control Circuit High Voltage
Quick Answer
The pressure control solenoid 4 is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. 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
- P2721 GMC indicates Pressure Control Solenoid 4 Control Circuit High Voltage.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
- 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.
Code P2721 GMC Description
The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module detects an open or short to voltage on the pressure control solenoid 4 control circuit for 1 s.
What are the Possible Causes of the DTC P2721 GMC?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Control Solenoid Valve Assembly
- Control Solenoid Valve Assembly harness or connectors
- Control Solenoid Valve Assembly circuit is open or shorted
How to Fix the DTC P2721 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 P2721 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.
Need more information about the P2721 GMC code?
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Need Help with the Code?
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Information for Specific GMC Models
- P2721 2014 GMC Sierra — Pressure Control Solenoid 4 Control Circuit High Voltage
- P2721 2015 GMC Sierra — Pressure Control Solenoid 4 Control Circuit High Voltage
- P2721 2016 GMC Sierra — Pressure Control Solenoid 4 Control Circuit High Voltage
- P2721 2017 GMC Sierra — Pressure Control Solenoid 4 Control Circuit High Voltage
- P2721 2018 GMC Sierra — Pressure Control Solenoid 4 Control Circuit High Voltage
Frequently Asked Questions about P2721 GMC Code
1. What does the OBDII code P2721 mean on a GMC vehicle?
P2721 indicates a "Pressure Control Solenoid 4 Control Circuit High Voltage," meaning the transmission control module (TCM) has detected an issue with the voltage in the circuit controlling the pressure control solenoid 4.
2. What are the common symptoms of a P2721 code on a GMC?
Common symptoms include harsh or delayed shifting, transmission slipping, erratic shifting, reduced fuel efficiency, and possibly the illumination of the check engine light.
3. What causes the P2721 code to appear on a GMC?
Possible causes include a faulty pressure control solenoid, damaged or corroded wiring or connectors in the circuit, issues with the transmission fluid (low or dirty), or a malfunctioning transmission control module (TCM).
4. Can driving with a P2721 code damage my GMC's transmission?
Yes, continuing to drive with this code can cause further wear or damage to the transmission. It's best to address the issue promptly.
5. How is the P2721 code diagnosed?
A mechanic will typically use a diagnostic scanner to confirm the code, inspect the wiring and connectors for damage or corrosion, test the pressure control solenoid, and check the transmission fluid level and condition.
6. What repairs can fix the P2721 code on a GMC?
Repairs may include replacing the faulty pressure control solenoid, repairing or replacing damaged wiring or connectors, flushing and refilling the transmission fluid, or reprogramming or replacing the TCM if needed.
7. Can low or dirty transmission fluid cause the P2721 code?
Yes, low or contaminated transmission fluid can affect the operation of the pressure control solenoid and trigger the P2721 code.
8. How much does it typically cost to fix a P2721 code on a GMC?
Repair costs can range from $150 to $1,000 depending on the specific issue, with solenoid replacement averaging $200–$400 and TCM replacement costing significantly more.
9. Can I reset the P2721 code without repairing the issue?
You can clear the code with a scan tool, but it will likely return if the underlying problem is not fixed.
10. Is the P2721 code specific to GMC vehicles?
No, the P2721 code can appear on other makes and models with automatic transmissions, but the specifics of the repair may vary based on the vehicle.
Discuss the causes and fixes for P2721 GMC OBDII Code
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