[en] We examine the internal consistency of the Planck 2015 cosmic microwave background (CMB) temperature anisotropy power spectrum. We show that tension exists between cosmological constant cold dark matter ($\mathrm{\Lambda <!--\; ??\; -->}\mathrm{C}\mathrm{D}\mathrm{M}$) model parameters inferred from multipoles $\mathrm{\ell <!--\; ???\; -->}<<!--\; <\; -->1000$ (roughly those accessible to Wilkinson Microwave Anisotropy Probe), and from $\mathrm{\ell <!--\; ???\; -->}⩾<!--\; ???\; -->1000$, particularly the CDM density, ${\mathrm{\Omega <!--\; ??\; -->}}_c{h}^2$, which is discrepant at $2.5\mathrm{\sigma <!--\; ??\; -->}$ for a Planck -motivated prior on the optical depth, $\mathrm{\tau <!--\; ??\; -->}=0.07\pm <!--\; ??\; -->0.02$. We find some parameter tensions to be larger than previously reported because of inaccuracy in the code used by the Planck Collaboration to generate model spectra. The Planck $\mathrm{\ell <!--\; ???\; -->}⩾<!--\; ???\; -->1000$ constraints are also in tension with low-redshift data sets, including Planck ’s own measurement of the CMB lensing power spectrum ($2.4\mathrm{\sigma <!--\; ??\; -->}$), and the most precise baryon acoustic oscillation scale determination ($2.5\mathrm{\sigma <!--\; ??\; -->}$). The Hubble constant predicted by Planck from $\mathrm{\ell <!--\; ???\; -->}⩾<!--\; ???\; -->1000$, $H_0=64.1\pm <!--\; ??\; -->1.7$ km s${}^{-<!--\; ???\; -->1}$ Mpc⁻¹, disagrees with the most precise local distance ladder measurement of $73.0\pm <!--\; ??\; -->2.4$ km s${}^{-<!--\; ???\; -->1}$ Mpc⁻¹ at the $3.0\mathrm{\sigma <!--\; ??\; -->}$ level, while the Planck value from $\mathrm{\ell <!--\; ???\; -->}<<!--\; <\; -->1000$, $69.7\pm <!--\; ??\; -->1.7$ km s${}^{-<!--\; ???\; -->1}$ Mpc⁻¹, is consistent within $1\mathrm{\sigma <!--\; ??\; -->}$. A discrepancy between the Planck and South Pole Telescope high-multipole CMB spectra disfavors interpreting these tensions as evidence for new physics. We conclude that the parameters from the Planck high-multipole spectrum probably differ from the underlying values due to either an unlikely statistical fluctuation or unaccounted-for systematics persisting in the Planck data.