P20E8 2016 GMC Sierra Code - Reductant Low Pressure
Quick Answer
The pressure sensor information is used by Reductant Control Module; this module manages the reductant pressure system driving the PWM signal to the pump (corresponding to a speed setpoint for the reductant pressure pump) in order to build the pressure in the reductant pressure pipeline after the system start-up. Common causes include Faulty Reductant Injector, Reductant Injector harness is open or shorted, Reductant Injector 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
- P20E8 2016 GMC Sierra indicates Reductant Low Pressure.
- Common causes
- Common causes include Faulty Reductant Injector, Reductant Injector harness is open or shorted, Reductant Injector 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 P20E8 2016 GMC Sierra Description
What are the Possible Causes of the DTC P20E8 2016 GMC Sierra?
- Faulty Reductant Injector
- Reductant Injector harness is open or shorted
- Reductant Injector circuit poor electrical connection
- Faulty Reductant Pump and Sensor Assembly
How to Fix the DTC P20E8 2016 GMC Sierra?
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 P20E8 2016 GMC Sierra 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 P20E8 2016 GMC Sierra code?
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Frequently Asked Questions about P20E8 2016 GMC Sierra Code
1. What does the OBDII code P20E8 mean on a 2016 GMC Sierra?
The P20E8 code indicates "Reductant Pressure Too Low," which means the diesel exhaust fluid (DEF) system is not maintaining sufficient pressure for proper operation.
2. What are the common symptoms of the P20E8 code on a 2016 GMC Sierra?
Symptoms include a Check Engine Light, DEF system warnings, reduced engine power, and possibly a countdown to limited vehicle operation.
3. What causes the P20E8 code on a 2016 GMC Sierra?
Common causes include a failing DEF pump, clogged filters or lines, low DEF fluid levels, or electrical issues within the reductant system.
4. Can a clogged DEF filter cause the P20E8 code?
Yes, a clogged or restricted DEF filter can reduce pressure in the system and trigger the P20E8 code.
5. How do you diagnose the P20E8 code on a 2016 GMC Sierra?
Diagnosis involves checking DEF fluid levels, inspecting the DEF pump and pressure sensor, testing for clogs in the lines or filters, and running a system scan for additional related codes.
6. Can driving with the P20E8 code damage the vehicle?
Continuing to drive with this code can lead to reduced engine performance and may eventually cause the vehicle to enter a "limp mode" or become inoperable.
7. How is the P20E8 code fixed on a 2016 GMC Sierra?
Repairs typically involve replacing the DEF pump, cleaning or replacing filters, flushing the DEF lines, or addressing electrical faults in the reductant system.
8. Does low DEF fluid cause the P20E8 code?
Low DEF levels can contribute to pressure issues, but the code usually points to a mechanical or electrical fault within the reductant system.
9. How much does it cost to repair the P20E8 code on a 2016 GMC Sierra?
Repair costs vary but replacing the DEF pump can range from $500 to $1,000, while simpler fixes like cleaning the filter may cost less.
10. Can resetting the Check Engine Light fix the P20E8 code?
Resetting the light may temporarily clear the code, but the underlying issue must be resolved to prevent the code from returning.
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