P0755

P0755 is the electrical circuit fault for Shift Solenoid B — same logic as P0750 but on the second shift solenoid in the pack. On 4-speed transmissions A and B together handle all four shift events through binary on/off combinations (00, 01, 10, 11 maps to gears 1-4); on 5- and 6-speeds there are additional solenoids (C, D, E) added to the matrix. Fluid level and condition first. Then external harness inspection at the case pass-through connector — corroded pins or pushed-back terminals create open-circuit conditions that scan identical to a failed solenoid. Ohm-check from the case connector pins for Shift Solenoid B per FSM spec (typically 10-40 ohms for on/off, 5-15 ohms for PWM linear); out-of-spec is a solenoid or solenoid-pack replacement, in-spec points upstream to wiring or the TCM driver. As with P0750, a clean electrical-circuit code with no companion performance code (P0756) usually means the problem is external — connector, harness, or TCM driver — rather than the solenoid itself.

Vehicle-specific patterns: 2004-2010 Ford F-150/Expedition with the 4R75E throws P0755 from internal valve-body harness corrosion or a degraded solenoid pack — Ford TSB recommends solenoid pack and harness as a kit, $250-400 part. 2003-2010 Honda Accord/Odyssey 5AT throws P0755 less often than P0750 but the part and procedure are the same (external solenoid swap, 30-45 minutes). 2007-2013 GM 6L80/6L90 integrates all shift solenoids into the TEHCM in the pan — P0755 there means TEHCM replacement, $600-900 part + 2 hours labor + relearn. 2005-2010 BMW/Mini with the 6HP19/6HP28 (ZF) throws P0755 from internal mechatronic-sleeve leakage; mechatronic rebuild required, $1,500-2,500. Estimated repair: $150 (connector) to $2,500+ (mechatronic).