Method for processing a signal of a pressure measuring device (D P) inside an internal combustion engine, said device including: - a pressure measuring sensor supplying an output voltage signal (S B) representing the pressure within the internal combustion engine, the signal (S B) including "plateau" phases during which the voltage changes according to a more or less linear function as a function of time, and voltage peak phases representing the combustion pressure peaks, - a processing unit connected to said pressure measuring sensor, the method including the following steps: I.Acquisition of the values of the signal (S B) by the processing unit, II. Detection by the processing unit of the voltage peaks of the signal (S B) representing the combustion pressure peaks. the method being characterized in that it furthermore includes the following steps: III.Calculation by the processing unit of a first duration between a first time corresponding to a first combustion pressure peak and a second time corresponding to a second combustion pressure peak, consecutive to the first combustion pressure peak, IV. Calculation by the processing unit of a correction start time (t c1) defined by: t c 1 = t 1 + x 1 ∗ Dt 1 Where: t c1 is the correction start time, t1 is a second time corresponding to a second combustion pressure peak, Dt1 is a first duration between the first time and the second time, x1 is a first constant with a value varying between 0.1 and 0.9. V.Measurement by the processing unit of a value of the signal (V OFF1) at the correction start time (t c1), VI. Correction by the processing unit of the signal (S B), on the basis of the correction start time (t c1) in relation to a reference value (V REF), and obtaining of a first processed signal such that: S = S B − V OFF 1 + V REF Where S B is the signal at the pressure measuring sensor output, V OFF1 is the value of the signal at the correction start time (t c1), V REF is the reference value. - a pressure measuring sensor supplying an output voltage signal (S B) representing the pressure within the internal combustion engine, the signal (S B) including "plateau" phases during which the voltage changes according to a more or less linear function as a function of time, and voltage peak phases representing the combustion pressure peaks, - a processing unit connected to said pressure measuring sensor, I.Acquisition of the values of the signal (S B) by the processing unit, II. Detection by the processing unit of the voltage peaks of the signal (S B) representing the combustion pressure peaks. III.Calculation by the processing unit of a first duration between a first time corresponding to a first combustion pressure peak and a second time corresponding to a second combustion pressure peak, consecutive to the first combustion pressure peak, IV. Calculation by the processing unit of a correction start time (t c1) defined by: t c 1 = t 1 + x 1 ∗ Dt 1 Where: t c1 is the correction start time, t1 is a second time corresponding to a second combustion pressure peak, Dt1 is a first duration between the first time and the second time, x1 is a first constant with a value varying between 0.1 and 0.9. t c1 is the correction start time, t1 is a second time corresponding to a second combustion pressure peak, Dt1 is a first duration between the first time and the second time, x1 is a first constant with a value varying between 0.1 and 0.9. V.Measurement by the processing unit of a value of the signal (V OFF1) at the correction start time (t c1), VI. Correction by the processing unit of the signal (S B), on the basis of the correction start time (t c1) in relation to a reference value (V REF), and obtaining of a first processed signal such that: S = S B − V OFF 1 + V REF Where S B is the signal at the pressure measuring sensor output, V OFF1 is the value of the signal at the correction start time (t c1), V REF is the reference value. Where S B is the signal at the pressure measuring sensor output, V OFF1 is the value of the signal at the correction start time (t c1), V REF is the reference value.