GMC Sierra 6.2 V8 403hp Remap

Name: GMC Sierra 6.2 V8 403hp ECU Remap
Brand: GMC

Expected gains of +22 BHP and +20 Nm torque

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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 headroom

Headroom

Low

GMC 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

Engine

Technical Specifications

Fuel Type: Petrol
Aspiration: Naturally Aspirated
Displacement: 6.2L
Capacity: 6162 CC
Type: Car
Engine Family: GMC 6.2L V8 NA Petrol

ECU & Transmission

Likely ECU Low confidence: Petrol ECU (varies by market/year)
Gearbox Low confidence: Transmission varies by trim and market; check manual/automatic type and torque rating. At this torque level, transmission and driveline servicing history becomes especially important.

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Confirm Your Vehicle

MakeGMC

ModelSierra

Generation2008 - 2013

Engine6.2 V8 403hp

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 before proceeding.

4.3 V6 195hp	195 → 215	+20	353 → 370	+17	Moderate (4/10)
4.8 V8 302hp	302 → 320	+18	414 → 435	+21	Limited (3.5/10)
5.3 V8 326hp	326 → 345	+19	472 → 495	+23	Limited (3.5/10)
6.0 V8 360hp	360 → 380	+20	515 → 535	+20	Limited (3/10)
6.6 Duramax 365hp	365 → 395	+30	894 → 945	+51	Moderate (5.5/10)