P0106

P0106 means the MAP signal is present and electrically valid but does not correlate with throttle position, RPM, and MAF — the classic example is MAP reading 70 kPa at idle when TPS is at 0% and engine speed is 750 RPM, where MAP should be 30-40 kPa. This is a rationality fault and points at vacuum leaks, restricted intake, or a drifted sensor far more often than at a wiring problem. Cheapest-first ladder: smoke-test the intake from the throttle body back through the manifold ($30 of smoke or a $200 smoke machine — a single vacuum leak at an intake gasket or PCV hose will set P0106 every time); inspect the PCV system because a stuck-open PCV valve is a calibrated vacuum leak large enough to throw P0106 on most platforms; compare MAP kPa at warm idle to expected — naturally aspirated gas engines should read 28-42 kPa at warm idle depending on cam profile, and 95-101 kPa at WOT/key-on, turbo engines should read 30-45 kPa at idle and 150-250 kPa at boost depending on tune; cross-check MAP against MAF on engines that have both — if MAF says 4 g/s and MAP says 70 kPa at idle, one of them is wrong and freeze-frame plus a known-good comparison will tell you which. Do not replace the MAP for P0106 before smoke-testing — intake leaks set P0106 far more often than failed sensors and the customer will be back in two weeks.

Vehicle-specific patterns: 2005-2010 Chrysler 5.7L Hemi sets P0106 from cracked intake manifold runners around 80-120k miles where the crack pulls atmospheric air past the MAP reference; 2007-2013 GM 5.3L/6.0L sets P0106 from leaking intake manifold gaskets at the valley plate, common after 100k miles; 2007-2014 Toyota 2GR-FE V6 (Camry, Highlander, Sienna) sees P0106 from a torn intake air bypass valve (IABV) gasket that creates an unmetered leak directly at the throttle body; 2008-2012 Ford 3.5L Cyclone EcoBoost sees P0106 from cracked charge-pipe couplers that leak boost pressure past the MAP reference. Estimated repair: $30 to $500.