P1402 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P1402 GMC?
- 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 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 P1402 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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Information for Specific GMC Models
- P1402 2014 GMC Sierra — Exhaust Gas Recirculation Supply Circuit
- P1402 2015 GMC Sierra — Exhaust Gas Recirculation Supply Circuit
- P1402 2016 GMC Sierra — Exhaust Gas Recirculation Supply Circuit
- P1402 2017 GMC Sierra — Exhaust Gas Recirculation Supply Circuit
- P1402 2018 GMC Sierra — Exhaust Gas Recirculation Supply Circuit
Frequently Asked Questions about P1402 GMC Code
1. What are the common symptoms of OBDII code P1402 in a GMC related to the Exhaust Gas Recirculation Supply Circuit?
The common symptoms include rough idling, decreased fuel efficiency, engine stalling, and the illumination of the Check Engine Light.
2. What are the possible causes of OBDII code P1402 in a GMC?
Possible causes can include a faulty EGR valve, clogged EGR passages, damaged wiring or connectors in the EGR system, or a malfunctioning EGR position sensor.
3. How can I diagnose the issue causing OBDII code P1402 in my GMC?
Diagnosis typically involves checking the EGR valve for functionality, inspecting the EGR passages for blockages, testing the EGR position sensor, and examining the wiring and connectors for any damage.
4. Can I continue driving my GMC with OBDII code P1402 present?
It is not recommended to continue driving with this code present, as it can lead to poor engine performance and potential damage over time. It's best to address the issue promptly.
5. How can I repair OBDII code P1402 related to the Exhaust Gas Recirculation Supply Circuit in my GMC?
Repairs may involve cleaning or replacing the EGR valve, clearing any blockages in the EGR passages, repairing or replacing damaged wiring or connectors, or replacing the EGR position sensor.
6. Is it possible to reset OBDII code P1402 in a GMC without fixing the underlying issue?
While you can clear the code with an OBDII scanner, it will likely reappear if the root cause of the problem is not addressed. It's important to diagnose and fix the issue to prevent further issues.
7. Can a DIY enthusiast fix OBDII code P1402 in a GMC at home?
Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue themselves. However, if you're unsure, it's best to consult a professional mechanic.
8. How much does it typically cost to repair OBDII code P1402 in a GMC at a mechanic?
The cost of repairs can vary depending on the specific cause of the issue, the labor rates of the mechanic, and the cost of any parts that need to be replaced. It's best to get a quote from a trusted mechanic.
9. Are there any preventive maintenance steps to avoid OBDII code P1402 in a GMC?
Regularly servicing the EGR system, using high-quality fuel, and ensuring proper engine maintenance can help prevent issues that may trigger OBDII code P1402.
10. Does OBDII code P1402 in a GMC always indicate a serious problem with the Exhaust Gas Recirculation Supply Circuit?
While this code should be addressed promptly, it doesn't always indicate a severe issue. However, ignoring it can lead to reduced engine performance and potential damage over time.
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