P128E GMC Code - Fuel Rail Pressure Performance
Quick Answer
During certain engine operating conditions the Engine Control Module (ECM) checks the actual fuel rail pressure reported from the fuel rail pressure sensor and compares the value to a set programed value. Common causes include Faulty Fuel Rail Pressure Sensor, Fuel Rail Pressure Sensor harness is open or shorted, Fuel Rail Pressure Sensor 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
- P128E GMC indicates Fuel Rail Pressure Performance.
- Common causes
- Common causes include Faulty Fuel Rail Pressure Sensor, Fuel Rail Pressure Sensor harness is open or shorted, Fuel Rail Pressure Sensor 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 P128E GMC Description
What are the Possible Causes of the DTC P128E GMC?
- Faulty Fuel Rail Pressure Sensor
- Fuel Rail Pressure Sensor harness is open or shorted
- Fuel Rail Pressure Sensor circuit poor electrical connection
How to Fix the DTC P128E 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 P128E 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 P128E GMC code?
Need more information on how to fix the P128E GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
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Frequently Asked Questions about P128E GMC Code
No Frequently Asked Questions about P128E GMC Code found.
Discuss the causes and fixes for P128E GMC OBDII Code
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loss of power now engine won't start. engine light came on .checked code it's P128E. Also charging system isn't charging properly . checked both batteries and alternator all are fine. also checked battery and alternator connections and all are fine
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The P128E is related to the fuel pressure. You should start by checking if there is fuel in the tank and if you have a good fuel pressure. Let me check if I can find more specific information about your vehicle, what model and year is your GMC?
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