P1402 Buick Code - Exhaust Gas Recirculation Supply Circuit
Quick Answer
The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation 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
- P1402 Buick indicates Exhaust Gas Recirculation Supply Circuit.
- Common causes
- Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation 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.
Code P1402 Buick Description
What are the Possible Causes of the DTC P1402 Buick?
- Faulty Exhaust Gas Recirculation (EGR) Valve
- Exhaust Gas Recirculation Valve harness is open or shorted
- Exhaust Gas Recirculation Valve circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1402 Buick?
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 P1402 Buick 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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Frequently Asked Questions about P1402 Buick Code
1. What are the common symptoms of OBDII code P1402 in a Buick related to the Exhaust Gas Recirculation (EGR) supply circuit?
The common symptoms of code P1402 may include rough idling, engine stalling, poor acceleration, and an illuminated check engine light.
2. What are the possible causes of OBDII code P1402 in a Buick?
The code P1402 in a Buick is typically triggered by issues such as a faulty EGR valve, a clogged EGR passage, a damaged EGR solenoid, or wiring/connectivity problems in the EGR system.
3. How can I diagnose the OBDII code P1402 in a Buick related to the EGR supply circuit?
Diagnosing code P1402 involves using a scan tool to retrieve the trouble codes, inspecting the EGR valve and related components for damage or blockages, and testing the electrical connections in the EGR system.
4. Can I drive my Buick with OBDII code P1402 triggered?
It is not recommended to drive your Buick with code P1402 active, as it can lead to poor engine performance and potential damage if left unresolved.
5. How can I repair OBDII code P1402 in my Buick's Exhaust Gas Recirculation system?
Repairing code P1402 may involve cleaning or replacing the EGR valve, clearing any blockages in the EGR passages, checking and repairing wiring issues, or replacing the EGR solenoid if necessary.
6. Will resetting the check engine light resolve OBDII code P1402 in a Buick?
Simply resetting the check engine light will not fix the underlying issue causing code P1402. It is important to diagnose and address the root cause of the problem to prevent the code from reoccurring.
7. Are there any DIY tips for troubleshooting OBDII code P1402 in a Buick?
While some basic inspections like checking for loose connections or vacuum leaks can be done by DIY enthusiasts, diagnosing and repairing code P1402 often requires specialized tools and knowledge best handled by a professional mechanic.
8. How much does it typically cost to repair OBDII code P1402 in a Buick at a repair shop?
The cost of repairing code P1402 can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
9. Can a faulty EGR valve cause OBDII code P1402 in a Buick?
Yes, a faulty EGR valve is one of the common culprits behind triggering code P1402 in a Buick's EGR system. It is essential to inspect and possibly replace the EGR valve if deemed defective.
10. How often does OBDII code P1402 related to the EGR supply circuit occur in Buick vehicles?
Code P1402 related to the EGR supply circuit is a relatively common issue in Buick vehicles, especially in older models or those with high mileage. Regular maintenance and inspections can help prevent such problems.
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