Mercedes Benz

The P0108 diagnostic trouble code indicates an issue with the pressure sensor (B28) and is caused when the Engine Control Module (ECM) detects a short circuit to positive or an open circuit in the sensor's wiring. Here are some steps that can help you fix the issue: Inspect the wiring: Inspect the wiring harness that connects the pressure sensor to the ECM for any visible damage, such as cuts, chafing, or breaks in the insulation. Also, check the connectors for corrosion or debris. Repair or replace any damaged wires or connectors. Check the pressure sensor: Check the pressure sensor for any visible damage, such as cracks or broken wires. If there is damage, replace the pressure sensor. Check the power supply: Using a multimeter, check the voltage supply to the pressure sensor. The voltage should be within the specified range. If the voltage is too low, there may be a problem with the power supply or wiring to the pressure sensor. Check the ECM: Use a diagnostic scanner t...

P0108 B28 (Pressure sensor) : Short circuit to positive or open circuit (P0108) Possible cause: ­ B28 (Pressure sensor) Affected functions: ­ Engine output ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ Test 1: Check component B28 (Pressure sensor). 1. Check component B28 (Pressure sensor). Test 1.1: Check component B28 (Pressure sensor) using actual value. Test 1.2: Test signal voltage of component B28 (Pressure sensor). Test 1.3: Check power supply of component B28 (Pressure sensor). 1.1. Check component B28 (Pressure sensor) using actual value. Test sequence 10.52SS Page 3682010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985) Copyright ? 2013, ALLDATA 10.52SS ­ Switch on ignition. Status of relevant actual value: ­ Intake manifold pressure (ADC):Warning! Communication with ECU required. Specified values ­ Intake manifold pressure,Ignition ON: > 3.5 V ­ Intake manifold pressure,Operate engine at idling speed.:< 2 V Question ­ Is the actua...