BHP+22 hp (5%)
Standard
403 hp
Tuned
425 hp
Torque+20 Nm (4%)
Standard
565 Nm
Tuned
585 Nm
Suitability
Limited (3/10)Gains Profile
Limited headroomHeadroom
LowGMC Sierra 6.2 V8 403hp ECU Remapping
Considering an ECU remap for your GMC Sierra 6.2 V8 403hp? A Stage 1 remap can take this 2008 - 2013 petrol engine from 403 BHP to 425 BHP and from 565 Nm to 585 Nm of torque (naturally aspirated). This engine scores 3/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your GMC Sierra can achieve.
How this engine compares
- 6thof 21 GMC Sierra engines by power gain
- 25%of the 9,842 engines we hold gain data for see a smaller power increase
- 8%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The GMC Sierra 6.2 V8 403hp is a 6.2L naturally aspirated petrol engine producing 403 BHP and 565 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 425 BHP and 585 Nm — a gain of around 22 BHP (5%) and 20 Nm (4%).
This engine has low remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, based on the percentage gain available from the factory output.
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
!High tuned torque: check transmission torque capacity and service history.
Other Sierra 2008 - 2013 Engines
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